X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fppc-linux-nat.c;h=d619971a001d225ea278c776e09fb5297074c6a7;hb=cd9629e1df1a280c19e1daaf6c1195afbab0aca9;hp=5f306134163321063fe9161caf6b381d89e49a80;hpb=4c6b5505c95f63853ce942030569d004e99dd8a2;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c index 5f30613416..d619971a00 100644 --- a/gdb/ppc-linux-nat.c +++ b/gdb/ppc-linux-nat.c @@ -1,13 +1,12 @@ /* PPC GNU/Linux native support. - Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003, - 2004, 2005, 2006, 2007 Free Software Foundation, Inc. + Copyright (C) 1988-2020 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or + the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -16,61 +15,46 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 51 Franklin Street, Fifth Floor, - Boston, MA 02110-1301, USA. */ + along with this program. If not, see . */ #include "defs.h" -#include "gdb_string.h" +#include "observable.h" #include "frame.h" #include "inferior.h" +#include "gdbthread.h" #include "gdbcore.h" #include "regcache.h" -#include "gdb_assert.h" +#include "regset.h" #include "target.h" #include "linux-nat.h" - -#include #include -#include #include #include #include -#include "gdb_wait.h" +#include +#include "gdbsupport/gdb_wait.h" #include #include -#include +#include "nat/gdb_ptrace.h" +#include "nat/linux-ptrace.h" +#include "inf-ptrace.h" -/* Prototypes for supply_gregset etc. */ +/* Prototypes for supply_gregset etc. */ #include "gregset.h" #include "ppc-tdep.h" +#include "ppc-linux-tdep.h" -/* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a - configure time check. Some older glibc's (for instance 2.2.1) - don't have a specific powerpc version of ptrace.h, and fall back on - a generic one. In such cases, sys/ptrace.h defines - PTRACE_GETFPXREGS and PTRACE_SETFPXREGS to the same numbers that - ppc kernel's asm/ptrace.h defines PTRACE_GETVRREGS and - PTRACE_SETVRREGS to be. This also makes a configury check pretty - much useless. */ - -/* These definitions should really come from the glibc header files, - but Glibc doesn't know about the vrregs yet. */ -#ifndef PTRACE_GETVRREGS -#define PTRACE_GETVRREGS 18 -#define PTRACE_SETVRREGS 19 -#endif - +/* Required when using the AUXV. */ +#include "elf/common.h" +#include "auxv.h" -/* Similarly for the ptrace requests for getting / setting the SPE - registers (ev0 -- ev31, acc, and spefscr). See the description of - gdb_evrregset_t for details. */ -#ifndef PTRACE_GETEVRREGS -#define PTRACE_GETEVRREGS 20 -#define PTRACE_SETEVRREGS 21 -#endif +#include "arch/ppc-linux-common.h" +#include "arch/ppc-linux-tdesc.h" +#include "nat/ppc-linux.h" +#include "linux-tdep.h" -/* Similarly for the hardware watchpoint support. */ +/* Similarly for the hardware watchpoint support. These requests are used + when the PowerPC HWDEBUG ptrace interface is not available. */ #ifndef PTRACE_GET_DEBUGREG #define PTRACE_GET_DEBUGREG 25 #endif @@ -81,6 +65,92 @@ #define PTRACE_GETSIGINFO 0x4202 #endif +/* These requests are used when the PowerPC HWDEBUG ptrace interface is + available. It exposes the debug facilities of PowerPC processors, as well + as additional features of BookE processors, such as ranged breakpoints and + watchpoints and hardware-accelerated condition evaluation. */ +#ifndef PPC_PTRACE_GETHWDBGINFO + +/* Not having PPC_PTRACE_GETHWDBGINFO defined means that the PowerPC HWDEBUG + ptrace interface is not present in ptrace.h, so we'll have to pretty much + include it all here so that the code at least compiles on older systems. */ +#define PPC_PTRACE_GETHWDBGINFO 0x89 +#define PPC_PTRACE_SETHWDEBUG 0x88 +#define PPC_PTRACE_DELHWDEBUG 0x87 + +struct ppc_debug_info +{ + uint32_t version; /* Only version 1 exists to date. */ + uint32_t num_instruction_bps; + uint32_t num_data_bps; + uint32_t num_condition_regs; + uint32_t data_bp_alignment; + uint32_t sizeof_condition; /* size of the DVC register. */ + uint64_t features; +}; + +/* Features will have bits indicating whether there is support for: */ +#define PPC_DEBUG_FEATURE_INSN_BP_RANGE 0x1 +#define PPC_DEBUG_FEATURE_INSN_BP_MASK 0x2 +#define PPC_DEBUG_FEATURE_DATA_BP_RANGE 0x4 +#define PPC_DEBUG_FEATURE_DATA_BP_MASK 0x8 + +struct ppc_hw_breakpoint +{ + uint32_t version; /* currently, version must be 1 */ + uint32_t trigger_type; /* only some combinations allowed */ + uint32_t addr_mode; /* address match mode */ + uint32_t condition_mode; /* break/watchpoint condition flags */ + uint64_t addr; /* break/watchpoint address */ + uint64_t addr2; /* range end or mask */ + uint64_t condition_value; /* contents of the DVC register */ +}; + +/* Trigger type. */ +#define PPC_BREAKPOINT_TRIGGER_EXECUTE 0x1 +#define PPC_BREAKPOINT_TRIGGER_READ 0x2 +#define PPC_BREAKPOINT_TRIGGER_WRITE 0x4 +#define PPC_BREAKPOINT_TRIGGER_RW 0x6 + +/* Address mode. */ +#define PPC_BREAKPOINT_MODE_EXACT 0x0 +#define PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE 0x1 +#define PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE 0x2 +#define PPC_BREAKPOINT_MODE_MASK 0x3 + +/* Condition mode. */ +#define PPC_BREAKPOINT_CONDITION_NONE 0x0 +#define PPC_BREAKPOINT_CONDITION_AND 0x1 +#define PPC_BREAKPOINT_CONDITION_EXACT 0x1 +#define PPC_BREAKPOINT_CONDITION_OR 0x2 +#define PPC_BREAKPOINT_CONDITION_AND_OR 0x3 +#define PPC_BREAKPOINT_CONDITION_BE_ALL 0x00ff0000 +#define PPC_BREAKPOINT_CONDITION_BE_SHIFT 16 +#define PPC_BREAKPOINT_CONDITION_BE(n) \ + (1<<((n)+PPC_BREAKPOINT_CONDITION_BE_SHIFT)) +#endif /* PPC_PTRACE_GETHWDBGINFO */ + +/* Feature defined on Linux kernel v3.9: DAWR interface, that enables wider + watchpoint (up to 512 bytes). */ +#ifndef PPC_DEBUG_FEATURE_DATA_BP_DAWR +#define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x10 +#endif /* PPC_DEBUG_FEATURE_DATA_BP_DAWR */ + +/* Similarly for the general-purpose (gp0 -- gp31) + and floating-point registers (fp0 -- fp31). */ +#ifndef PTRACE_GETREGS +#define PTRACE_GETREGS 12 +#endif +#ifndef PTRACE_SETREGS +#define PTRACE_SETREGS 13 +#endif +#ifndef PTRACE_GETFPREGS +#define PTRACE_GETFPREGS 14 +#endif +#ifndef PTRACE_SETFPREGS +#define PTRACE_SETFPREGS 15 +#endif + /* This oddity is because the Linux kernel defines elf_vrregset_t as an array of 33 16 bytes long elements. I.e. it leaves out vrsave. However the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests return @@ -89,31 +159,63 @@ There are 32 vector registers 16 bytes longs, plus a VSCR register which is only 4 bytes long, but is fetched as a 16 bytes - quantity. Up to here we have the elf_vrregset_t structure. + quantity. Up to here we have the elf_vrregset_t structure. Appended to this there is space for the VRSAVE register: 4 bytes. Even though this vrsave register is not included in the regset typedef, it is handled by the ptrace requests. - Note that GNU/Linux doesn't support little endian PPC hardware, - therefore the offset at which the real value of the VSCR register - is located will be always 12 bytes. - The layout is like this (where x is the actual value of the vscr reg): */ /* *INDENT-OFF* */ /* +Big-Endian: |.|.|.|.|.....|.|.|.|.||.|.|.|x||.| <-------> <-------><-------><-> VR0 VR31 VSCR VRSAVE +Little-Endian: + |.|.|.|.|.....|.|.|.|.||X|.|.|.||.| + <-------> <-------><-------><-> + VR0 VR31 VSCR VRSAVE */ /* *INDENT-ON* */ -#define SIZEOF_VRREGS 33*16+4 - -typedef char gdb_vrregset_t[SIZEOF_VRREGS]; - +typedef char gdb_vrregset_t[PPC_LINUX_SIZEOF_VRREGSET]; + +/* This is the layout of the POWER7 VSX registers and the way they overlap + with the existing FPR and VMX registers. + + VSR doubleword 0 VSR doubleword 1 + ---------------------------------------------------------------- + VSR[0] | FPR[0] | | + ---------------------------------------------------------------- + VSR[1] | FPR[1] | | + ---------------------------------------------------------------- + | ... | | + | ... | | + ---------------------------------------------------------------- + VSR[30] | FPR[30] | | + ---------------------------------------------------------------- + VSR[31] | FPR[31] | | + ---------------------------------------------------------------- + VSR[32] | VR[0] | + ---------------------------------------------------------------- + VSR[33] | VR[1] | + ---------------------------------------------------------------- + | ... | + | ... | + ---------------------------------------------------------------- + VSR[62] | VR[30] | + ---------------------------------------------------------------- + VSR[63] | VR[31] | + ---------------------------------------------------------------- + + VSX has 64 128bit registers. The first 32 registers overlap with + the FP registers (doubleword 0) and hence extend them with additional + 64 bits (doubleword 1). The other 32 regs overlap with the VMX + registers. */ +typedef char gdb_vsxregset_t[PPC_LINUX_SIZEOF_VSXREGSET]; -/* On PPC processors that support the the Signal Processing Extension +/* On PPC processors that support the Signal Processing Extension (SPE) APU, the general-purpose registers are 64 bits long. However, the ordinary Linux kernel PTRACE_PEEKUSER / PTRACE_POKEUSER ptrace calls only access the lower half of each register, to allow @@ -124,7 +226,7 @@ typedef char gdb_vrregset_t[SIZEOF_VRREGS]; GDB itself continues to claim the general-purpose registers are 32 bits long. It has unnamed raw registers that hold the upper halves - of the gprs, and the the full 64-bit SIMD views of the registers, + of the gprs, and the full 64-bit SIMD views of the registers, 'ev0' -- 'ev31', are pseudo-registers that splice the top and bottom halves together. @@ -137,6 +239,12 @@ struct gdb_evrregset_t unsigned long spefscr; }; +/* Non-zero if our kernel may support the PTRACE_GETVSXREGS and + PTRACE_SETVSXREGS requests, for reading and writing the VSX + POWER7 registers 0 through 31. Zero if we've tried one of them and + gotten an error. Note that VSX registers 32 through 63 overlap + with VR registers 0 through 31. */ +int have_ptrace_getsetvsxregs = 1; /* Non-zero if our kernel may support the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests, for reading and writing the Altivec @@ -144,37 +252,105 @@ struct gdb_evrregset_t error. */ int have_ptrace_getvrregs = 1; -static CORE_ADDR last_stopped_data_address = 0; - /* Non-zero if our kernel may support the PTRACE_GETEVRREGS and PTRACE_SETEVRREGS requests, for reading and writing the SPE registers. Zero if we've tried one of them and gotten an error. */ int have_ptrace_getsetevrregs = 1; +/* Non-zero if our kernel may support the PTRACE_GETREGS and + PTRACE_SETREGS requests, for reading and writing the + general-purpose registers. Zero if we've tried one of + them and gotten an error. */ +int have_ptrace_getsetregs = 1; + +/* Non-zero if our kernel may support the PTRACE_GETFPREGS and + PTRACE_SETFPREGS requests, for reading and writing the + floating-pointers registers. Zero if we've tried one of + them and gotten an error. */ +int have_ptrace_getsetfpregs = 1; + +struct ppc_linux_nat_target final : public linux_nat_target +{ + /* Add our register access methods. */ + void fetch_registers (struct regcache *, int) override; + void store_registers (struct regcache *, int) override; + + /* Add our breakpoint/watchpoint methods. */ + int can_use_hw_breakpoint (enum bptype, int, int) override; + + int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *) + override; + + int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *) + override; + + int region_ok_for_hw_watchpoint (CORE_ADDR, int) override; + + int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type, + struct expression *) override; + + int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type, + struct expression *) override; + + int insert_mask_watchpoint (CORE_ADDR, CORE_ADDR, enum target_hw_bp_type) + override; + + int remove_mask_watchpoint (CORE_ADDR, CORE_ADDR, enum target_hw_bp_type) + override; + + bool stopped_by_watchpoint () override; + + bool stopped_data_address (CORE_ADDR *) override; + + bool watchpoint_addr_within_range (CORE_ADDR, CORE_ADDR, int) override; + + bool can_accel_watchpoint_condition (CORE_ADDR, int, int, struct expression *) + override; + + int masked_watch_num_registers (CORE_ADDR, CORE_ADDR) override; + + int ranged_break_num_registers () override; + + const struct target_desc *read_description () override; + + int auxv_parse (gdb_byte **readptr, + gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) + override; + + /* Override linux_nat_target low methods. */ + void low_new_thread (struct lwp_info *lp) override; +}; + +static ppc_linux_nat_target the_ppc_linux_nat_target; + /* *INDENT-OFF* */ /* registers layout, as presented by the ptrace interface: PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15, PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23, PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31, -PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14, -PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30, -PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46, -PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62, +PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, +PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14, +PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, +PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30, +PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, +PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46, +PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, +PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62, PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */ /* *INDENT_ON * */ static int -ppc_register_u_addr (int regno) +ppc_register_u_addr (struct gdbarch *gdbarch, int regno) { int u_addr = -1; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace interface, and not the wordsize of the program's ABI. */ int wordsize = sizeof (long); - /* General purpose registers occupy 1 slot each in the buffer */ + /* General purpose registers occupy 1 slot each in the buffer. */ if (regno >= tdep->ppc_gp0_regnum && regno < tdep->ppc_gp0_regnum + ppc_num_gprs) u_addr = ((regno - tdep->ppc_gp0_regnum + PT_R0) * wordsize); @@ -187,8 +363,8 @@ ppc_register_u_addr (int regno) && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) u_addr = (PT_FPR0 * wordsize) + ((regno - tdep->ppc_fp0_regnum) * 8); - /* UISA special purpose registers: 1 slot each */ - if (regno == PC_REGNUM) + /* UISA special purpose registers: 1 slot each. */ + if (regno == gdbarch_pc_regnum (gdbarch)) u_addr = PT_NIP * wordsize; if (regno == tdep->ppc_lr_regnum) u_addr = PT_LNK * wordsize; @@ -204,6 +380,10 @@ ppc_register_u_addr (int regno) #endif if (regno == tdep->ppc_ps_regnum) u_addr = PT_MSR * wordsize; + if (regno == PPC_ORIG_R3_REGNUM) + u_addr = PT_ORIG_R3 * wordsize; + if (regno == PPC_TRAP_REGNUM) + u_addr = PT_TRAP * wordsize; if (tdep->ppc_fpscr_regnum >= 0 && regno == tdep->ppc_fpscr_regnum) { @@ -211,28 +391,59 @@ ppc_register_u_addr (int regno) kernel headers incorrectly contained the 32-bit definition of PT_FPSCR. For the 32-bit definition, floating-point registers occupy two 32-bit "slots", and the FPSCR lives in - the secondhalf of such a slot-pair (hence +1). For 64-bit, + the second half of such a slot-pair (hence +1). For 64-bit, the FPSCR instead occupies the full 64-bit 2-word-slot and hence no adjustment is necessary. Hack around this. */ if (wordsize == 8 && PT_FPSCR == (48 + 32 + 1)) u_addr = (48 + 32) * wordsize; + /* If the FPSCR is 64-bit wide, we need to fetch the whole 64-bit + slot and not just its second word. The PT_FPSCR supplied when + GDB is compiled as a 32-bit app doesn't reflect this. */ + else if (wordsize == 4 && register_size (gdbarch, regno) == 8 + && PT_FPSCR == (48 + 2*32 + 1)) + u_addr = (48 + 2*32) * wordsize; else u_addr = PT_FPSCR * wordsize; } return u_addr; } +/* The Linux kernel ptrace interface for POWER7 VSX registers uses the + registers set mechanism, as opposed to the interface for all the + other registers, that stores/fetches each register individually. */ +static void +fetch_vsx_registers (struct regcache *regcache, int tid, int regno) +{ + int ret; + gdb_vsxregset_t regs; + const struct regset *vsxregset = ppc_linux_vsxregset (); + + ret = ptrace (PTRACE_GETVSXREGS, tid, 0, ®s); + if (ret < 0) + { + if (errno == EIO) + { + have_ptrace_getsetvsxregs = 0; + return; + } + perror_with_name (_("Unable to fetch VSX registers")); + } + + vsxregset->supply_regset (vsxregset, regcache, regno, ®s, + PPC_LINUX_SIZEOF_VSXREGSET); +} + /* The Linux kernel ptrace interface for AltiVec registers uses the registers set mechanism, as opposed to the interface for all the other registers, that stores/fetches each register individually. */ static void -fetch_altivec_register (struct regcache *regcache, int tid, int regno) +fetch_altivec_registers (struct regcache *regcache, int tid, + int regno) { int ret; - int offset = 0; gdb_vrregset_t regs; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - int vrregsize = register_size (current_gdbarch, tdep->ppc_vr0_regnum); + struct gdbarch *gdbarch = regcache->arch (); + const struct regset *vrregset = ppc_linux_vrregset (gdbarch); ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) @@ -242,18 +453,11 @@ fetch_altivec_register (struct regcache *regcache, int tid, int regno) have_ptrace_getvrregs = 0; return; } - perror_with_name (_("Unable to fetch AltiVec register")); + perror_with_name (_("Unable to fetch AltiVec registers")); } - - /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes - long on the hardware. We deal only with the lower 4 bytes of the - vector. VRSAVE is at the end of the array in a 4 bytes slot, so - there is no need to define an offset for it. */ - if (regno == (tdep->ppc_vrsave_regnum - 1)) - offset = vrregsize - register_size (current_gdbarch, tdep->ppc_vrsave_regnum); - - regcache_raw_supply (regcache, regno, - regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset); + + vrregset->supply_regset (vrregset, regcache, regno, ®s, + PPC_LINUX_SIZEOF_VRREGSET); } /* Fetch the top 32 bits of TID's general-purpose registers and the @@ -293,15 +497,16 @@ get_spe_registers (int tid, struct gdb_evrregset_t *evrregset) static void fetch_spe_register (struct regcache *regcache, int tid, int regno) { - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); struct gdb_evrregset_t evrregs; gdb_assert (sizeof (evrregs.evr[0]) - == register_size (current_gdbarch, tdep->ppc_ev0_upper_regnum)); + == register_size (gdbarch, tdep->ppc_ev0_upper_regnum)); gdb_assert (sizeof (evrregs.acc) - == register_size (current_gdbarch, tdep->ppc_acc_regnum)); + == register_size (gdbarch, tdep->ppc_acc_regnum)); gdb_assert (sizeof (evrregs.spefscr) - == register_size (current_gdbarch, tdep->ppc_spefscr_regnum)); + == register_size (gdbarch, tdep->ppc_spefscr_regnum)); get_spe_registers (tid, &evrregs); @@ -310,59 +515,258 @@ fetch_spe_register (struct regcache *regcache, int tid, int regno) int i; for (i = 0; i < ppc_num_gprs; i++) - regcache_raw_supply (regcache, tdep->ppc_ev0_upper_regnum + i, - &evrregs.evr[i]); + regcache->raw_supply (tdep->ppc_ev0_upper_regnum + i, &evrregs.evr[i]); } else if (tdep->ppc_ev0_upper_regnum <= regno && regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs) - regcache_raw_supply (regcache, regno, - &evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]); + regcache->raw_supply (regno, + &evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]); if (regno == -1 || regno == tdep->ppc_acc_regnum) - regcache_raw_supply (regcache, tdep->ppc_acc_regnum, &evrregs.acc); + regcache->raw_supply (tdep->ppc_acc_regnum, &evrregs.acc); if (regno == -1 || regno == tdep->ppc_spefscr_regnum) - regcache_raw_supply (regcache, tdep->ppc_spefscr_regnum, - &evrregs.spefscr); + regcache->raw_supply (tdep->ppc_spefscr_regnum, &evrregs.spefscr); +} + +/* Use ptrace to fetch all registers from the register set with note + type REGSET_ID, size REGSIZE, and layout described by REGSET, from + process/thread TID and supply their values to REGCACHE. If ptrace + returns ENODATA to indicate the regset is unavailable, mark the + registers as unavailable in REGCACHE. */ + +static void +fetch_regset (struct regcache *regcache, int tid, + int regset_id, int regsetsize, const struct regset *regset) +{ + void *buf = alloca (regsetsize); + struct iovec iov; + + iov.iov_base = buf; + iov.iov_len = regsetsize; + + if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) < 0) + { + if (errno == ENODATA) + regset->supply_regset (regset, regcache, -1, NULL, regsetsize); + else + perror_with_name (_("Couldn't get register set")); + } + else + regset->supply_regset (regset, regcache, -1, buf, regsetsize); +} + +/* Use ptrace to store register REGNUM of the regset with note type + REGSET_ID, size REGSETSIZE, and layout described by REGSET, from + REGCACHE back to process/thread TID. If REGNUM is -1 all registers + in the set are collected and stored. */ + +static void +store_regset (const struct regcache *regcache, int tid, int regnum, + int regset_id, int regsetsize, const struct regset *regset) +{ + void *buf = alloca (regsetsize); + struct iovec iov; + + iov.iov_base = buf; + iov.iov_len = regsetsize; + + /* Make sure that the buffer that will be stored has up to date values + for the registers that won't be collected. */ + if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) < 0) + perror_with_name (_("Couldn't get register set")); + + regset->collect_regset (regset, regcache, regnum, buf, regsetsize); + + if (ptrace (PTRACE_SETREGSET, tid, regset_id, &iov) < 0) + perror_with_name (_("Couldn't set register set")); +} + +/* Check whether the kernel provides a register set with number + REGSET_ID of size REGSETSIZE for process/thread TID. */ + +static bool +check_regset (int tid, int regset_id, int regsetsize) +{ + void *buf = alloca (regsetsize); + struct iovec iov; + + iov.iov_base = buf; + iov.iov_len = regsetsize; + + if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) >= 0 + || errno == ENODATA) + return true; + else + return false; } static void fetch_register (struct regcache *regcache, int tid, int regno) { - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* This isn't really an address. But ptrace thinks of it as one. */ - CORE_ADDR regaddr = ppc_register_u_addr (regno); + CORE_ADDR regaddr = ppc_register_u_addr (gdbarch, regno); int bytes_transferred; - unsigned int offset; /* Offset of registers within the u area. */ - char buf[MAX_REGISTER_SIZE]; + gdb_byte buf[PPC_MAX_REGISTER_SIZE]; - if (altivec_register_p (regno)) + if (altivec_register_p (gdbarch, regno)) { /* If this is the first time through, or if it is not the first - time through, and we have comfirmed that there is kernel + time through, and we have confirmed that there is kernel support for such a ptrace request, then go and fetch the register. */ if (have_ptrace_getvrregs) { - fetch_altivec_register (regcache, tid, regno); + fetch_altivec_registers (regcache, tid, regno); return; } /* If we have discovered that there is no ptrace support for AltiVec registers, fall through and return zeroes, because regaddr will be -1 in this case. */ } - else if (spe_register_p (regno)) + else if (vsx_register_p (gdbarch, regno)) + { + if (have_ptrace_getsetvsxregs) + { + fetch_vsx_registers (regcache, tid, regno); + return; + } + } + else if (spe_register_p (gdbarch, regno)) { fetch_spe_register (regcache, tid, regno); return; } + else if (regno == PPC_DSCR_REGNUM) + { + gdb_assert (tdep->ppc_dscr_regnum != -1); + + fetch_regset (regcache, tid, NT_PPC_DSCR, + PPC_LINUX_SIZEOF_DSCRREGSET, + &ppc32_linux_dscrregset); + return; + } + else if (regno == PPC_PPR_REGNUM) + { + gdb_assert (tdep->ppc_ppr_regnum != -1); + + fetch_regset (regcache, tid, NT_PPC_PPR, + PPC_LINUX_SIZEOF_PPRREGSET, + &ppc32_linux_pprregset); + return; + } + else if (regno == PPC_TAR_REGNUM) + { + gdb_assert (tdep->ppc_tar_regnum != -1); + + fetch_regset (regcache, tid, NT_PPC_TAR, + PPC_LINUX_SIZEOF_TARREGSET, + &ppc32_linux_tarregset); + return; + } + else if (PPC_IS_EBB_REGNUM (regno)) + { + gdb_assert (tdep->have_ebb); + + fetch_regset (regcache, tid, NT_PPC_EBB, + PPC_LINUX_SIZEOF_EBBREGSET, + &ppc32_linux_ebbregset); + return; + } + else if (PPC_IS_PMU_REGNUM (regno)) + { + gdb_assert (tdep->ppc_mmcr0_regnum != -1); + + fetch_regset (regcache, tid, NT_PPC_PMU, + PPC_LINUX_SIZEOF_PMUREGSET, + &ppc32_linux_pmuregset); + return; + } + else if (PPC_IS_TMSPR_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_spr); + + fetch_regset (regcache, tid, NT_PPC_TM_SPR, + PPC_LINUX_SIZEOF_TM_SPRREGSET, + &ppc32_linux_tm_sprregset); + return; + } + else if (PPC_IS_CKPTGP_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_core); + + const struct regset *cgprregset = ppc_linux_cgprregset (gdbarch); + fetch_regset (regcache, tid, NT_PPC_TM_CGPR, + (tdep->wordsize == 4? + PPC32_LINUX_SIZEOF_CGPRREGSET + : PPC64_LINUX_SIZEOF_CGPRREGSET), + cgprregset); + return; + } + else if (PPC_IS_CKPTFP_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_fpu); + + fetch_regset (regcache, tid, NT_PPC_TM_CFPR, + PPC_LINUX_SIZEOF_CFPRREGSET, + &ppc32_linux_cfprregset); + return; + } + else if (PPC_IS_CKPTVMX_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_altivec); + + const struct regset *cvmxregset = ppc_linux_cvmxregset (gdbarch); + fetch_regset (regcache, tid, NT_PPC_TM_CVMX, + PPC_LINUX_SIZEOF_CVMXREGSET, + cvmxregset); + return; + } + else if (PPC_IS_CKPTVSX_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_vsx); + + fetch_regset (regcache, tid, NT_PPC_TM_CVSX, + PPC_LINUX_SIZEOF_CVSXREGSET, + &ppc32_linux_cvsxregset); + return; + } + else if (regno == PPC_CPPR_REGNUM) + { + gdb_assert (tdep->ppc_cppr_regnum != -1); + + fetch_regset (regcache, tid, NT_PPC_TM_CPPR, + PPC_LINUX_SIZEOF_CPPRREGSET, + &ppc32_linux_cpprregset); + return; + } + else if (regno == PPC_CDSCR_REGNUM) + { + gdb_assert (tdep->ppc_cdscr_regnum != -1); + + fetch_regset (regcache, tid, NT_PPC_TM_CDSCR, + PPC_LINUX_SIZEOF_CDSCRREGSET, + &ppc32_linux_cdscrregset); + return; + } + else if (regno == PPC_CTAR_REGNUM) + { + gdb_assert (tdep->ppc_ctar_regnum != -1); + + fetch_regset (regcache, tid, NT_PPC_TM_CTAR, + PPC_LINUX_SIZEOF_CTARREGSET, + &ppc32_linux_ctarregset); + return; + } if (regaddr == -1) { - memset (buf, '\0', register_size (current_gdbarch, regno)); /* Supply zeroes */ - regcache_raw_supply (regcache, regno, buf); + memset (buf, '\0', register_size (gdbarch, regno)); /* Supply zeroes */ + regcache->raw_supply (regno, buf); return; } @@ -370,100 +774,160 @@ fetch_register (struct regcache *regcache, int tid, int regno) 32-bit platform, 64-bit floating-point registers will require two transfers. */ for (bytes_transferred = 0; - bytes_transferred < register_size (current_gdbarch, regno); + bytes_transferred < register_size (gdbarch, regno); bytes_transferred += sizeof (long)) { + long l; + errno = 0; - *(long *) &buf[bytes_transferred] - = ptrace (PTRACE_PEEKUSER, tid, (PTRACE_TYPE_ARG3) regaddr, 0); + l = ptrace (PTRACE_PEEKUSER, tid, (PTRACE_TYPE_ARG3) regaddr, 0); regaddr += sizeof (long); if (errno != 0) { char message[128]; - sprintf (message, "reading register %s (#%d)", - REGISTER_NAME (regno), regno); + xsnprintf (message, sizeof (message), "reading register %s (#%d)", + gdbarch_register_name (gdbarch, regno), regno); perror_with_name (message); } + memcpy (&buf[bytes_transferred], &l, sizeof (l)); } /* Now supply the register. Keep in mind that the regcache's idea of the register's size may not be a multiple of sizeof (long). */ - if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_LITTLE) + if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) { /* Little-endian values are always found at the left end of the bytes transferred. */ - regcache_raw_supply (regcache, regno, buf); + regcache->raw_supply (regno, buf); } - else if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG) + else if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) { /* Big-endian values are found at the right end of the bytes transferred. */ - size_t padding = (bytes_transferred - - register_size (current_gdbarch, regno)); - regcache_raw_supply (regcache, regno, buf + padding); + size_t padding = (bytes_transferred - register_size (gdbarch, regno)); + regcache->raw_supply (regno, buf + padding); } else internal_error (__FILE__, __LINE__, _("fetch_register: unexpected byte order: %d"), - gdbarch_byte_order (current_gdbarch)); + gdbarch_byte_order (gdbarch)); } -static void -supply_vrregset (struct regcache *regcache, gdb_vrregset_t *vrregsetp) +/* This function actually issues the request to ptrace, telling + it to get all general-purpose registers and put them into the + specified regset. + + If the ptrace request does not exist, this function returns 0 + and properly sets the have_ptrace_* flag. If the request fails, + this function calls perror_with_name. Otherwise, if the request + succeeds, then the regcache gets filled and 1 is returned. */ +static int +fetch_all_gp_regs (struct regcache *regcache, int tid) { - int i; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1; - int vrregsize = register_size (current_gdbarch, tdep->ppc_vr0_regnum); - int offset = vrregsize - register_size (current_gdbarch, tdep->ppc_vrsave_regnum); - - for (i = 0; i < num_of_vrregs; i++) - { - /* The last 2 registers of this set are only 32 bit long, not - 128. However an offset is necessary only for VSCR because it - occupies a whole vector, while VRSAVE occupies a full 4 bytes - slot. */ - if (i == (num_of_vrregs - 2)) - regcache_raw_supply (regcache, tdep->ppc_vr0_regnum + i, - *vrregsetp + i * vrregsize + offset); - else - regcache_raw_supply (regcache, tdep->ppc_vr0_regnum + i, - *vrregsetp + i * vrregsize); + gdb_gregset_t gregset; + + if (ptrace (PTRACE_GETREGS, tid, 0, (void *) &gregset) < 0) + { + if (errno == EIO) + { + have_ptrace_getsetregs = 0; + return 0; + } + perror_with_name (_("Couldn't get general-purpose registers.")); } + + supply_gregset (regcache, (const gdb_gregset_t *) &gregset); + + return 1; } +/* This is a wrapper for the fetch_all_gp_regs function. It is + responsible for verifying if this target has the ptrace request + that can be used to fetch all general-purpose registers at one + shot. If it doesn't, then we should fetch them using the + old-fashioned way, which is to iterate over the registers and + request them one by one. */ static void -fetch_altivec_registers (struct regcache *regcache, int tid) +fetch_gp_regs (struct regcache *regcache, int tid) { - int ret; - gdb_vrregset_t regs; - - ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); - if (ret < 0) + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + int i; + + if (have_ptrace_getsetregs) + if (fetch_all_gp_regs (regcache, tid)) + return; + + /* If we've hit this point, it doesn't really matter which + architecture we are using. We just need to read the + registers in the "old-fashioned way". */ + for (i = 0; i < ppc_num_gprs; i++) + fetch_register (regcache, tid, tdep->ppc_gp0_regnum + i); +} + +/* This function actually issues the request to ptrace, telling + it to get all floating-point registers and put them into the + specified regset. + + If the ptrace request does not exist, this function returns 0 + and properly sets the have_ptrace_* flag. If the request fails, + this function calls perror_with_name. Otherwise, if the request + succeeds, then the regcache gets filled and 1 is returned. */ +static int +fetch_all_fp_regs (struct regcache *regcache, int tid) +{ + gdb_fpregset_t fpregs; + + if (ptrace (PTRACE_GETFPREGS, tid, 0, (void *) &fpregs) < 0) { if (errno == EIO) - { - have_ptrace_getvrregs = 0; - return; - } - perror_with_name (_("Unable to fetch AltiVec registers")); + { + have_ptrace_getsetfpregs = 0; + return 0; + } + perror_with_name (_("Couldn't get floating-point registers.")); } - supply_vrregset (regcache, ®s); + + supply_fpregset (regcache, (const gdb_fpregset_t *) &fpregs); + + return 1; +} + +/* This is a wrapper for the fetch_all_fp_regs function. It is + responsible for verifying if this target has the ptrace request + that can be used to fetch all floating-point registers at one + shot. If it doesn't, then we should fetch them using the + old-fashioned way, which is to iterate over the registers and + request them one by one. */ +static void +fetch_fp_regs (struct regcache *regcache, int tid) +{ + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + int i; + + if (have_ptrace_getsetfpregs) + if (fetch_all_fp_regs (regcache, tid)) + return; + + /* If we've hit this point, it doesn't really matter which + architecture we are using. We just need to read the + registers in the "old-fashioned way". */ + for (i = 0; i < ppc_num_fprs; i++) + fetch_register (regcache, tid, tdep->ppc_fp0_regnum + i); } static void fetch_ppc_registers (struct regcache *regcache, int tid) { - int i; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); - for (i = 0; i < ppc_num_gprs; i++) - fetch_register (regcache, tid, tdep->ppc_gp0_regnum + i); + fetch_gp_regs (regcache, tid); if (tdep->ppc_fp0_regnum >= 0) - for (i = 0; i < ppc_num_fprs; i++) - fetch_register (regcache, tid, tdep->ppc_fp0_regnum + i); - fetch_register (regcache, tid, PC_REGNUM); + fetch_fp_regs (regcache, tid); + fetch_register (regcache, tid, gdbarch_pc_regnum (gdbarch)); if (tdep->ppc_ps_regnum != -1) fetch_register (regcache, tid, tdep->ppc_ps_regnum); if (tdep->ppc_cr_regnum != -1) @@ -476,27 +940,90 @@ fetch_ppc_registers (struct regcache *regcache, int tid) fetch_register (regcache, tid, tdep->ppc_xer_regnum); if (tdep->ppc_mq_regnum != -1) fetch_register (regcache, tid, tdep->ppc_mq_regnum); + if (ppc_linux_trap_reg_p (gdbarch)) + { + fetch_register (regcache, tid, PPC_ORIG_R3_REGNUM); + fetch_register (regcache, tid, PPC_TRAP_REGNUM); + } if (tdep->ppc_fpscr_regnum != -1) fetch_register (regcache, tid, tdep->ppc_fpscr_regnum); if (have_ptrace_getvrregs) if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) - fetch_altivec_registers (regcache, tid); + fetch_altivec_registers (regcache, tid, -1); + if (have_ptrace_getsetvsxregs) + if (tdep->ppc_vsr0_upper_regnum != -1) + fetch_vsx_registers (regcache, tid, -1); if (tdep->ppc_ev0_upper_regnum >= 0) fetch_spe_register (regcache, tid, -1); + if (tdep->ppc_ppr_regnum != -1) + fetch_regset (regcache, tid, NT_PPC_PPR, + PPC_LINUX_SIZEOF_PPRREGSET, + &ppc32_linux_pprregset); + if (tdep->ppc_dscr_regnum != -1) + fetch_regset (regcache, tid, NT_PPC_DSCR, + PPC_LINUX_SIZEOF_DSCRREGSET, + &ppc32_linux_dscrregset); + if (tdep->ppc_tar_regnum != -1) + fetch_regset (regcache, tid, NT_PPC_TAR, + PPC_LINUX_SIZEOF_TARREGSET, + &ppc32_linux_tarregset); + if (tdep->have_ebb) + fetch_regset (regcache, tid, NT_PPC_EBB, + PPC_LINUX_SIZEOF_EBBREGSET, + &ppc32_linux_ebbregset); + if (tdep->ppc_mmcr0_regnum != -1) + fetch_regset (regcache, tid, NT_PPC_PMU, + PPC_LINUX_SIZEOF_PMUREGSET, + &ppc32_linux_pmuregset); + if (tdep->have_htm_spr) + fetch_regset (regcache, tid, NT_PPC_TM_SPR, + PPC_LINUX_SIZEOF_TM_SPRREGSET, + &ppc32_linux_tm_sprregset); + if (tdep->have_htm_core) + { + const struct regset *cgprregset = ppc_linux_cgprregset (gdbarch); + fetch_regset (regcache, tid, NT_PPC_TM_CGPR, + (tdep->wordsize == 4? + PPC32_LINUX_SIZEOF_CGPRREGSET + : PPC64_LINUX_SIZEOF_CGPRREGSET), + cgprregset); + } + if (tdep->have_htm_fpu) + fetch_regset (regcache, tid, NT_PPC_TM_CFPR, + PPC_LINUX_SIZEOF_CFPRREGSET, + &ppc32_linux_cfprregset); + if (tdep->have_htm_altivec) + { + const struct regset *cvmxregset = ppc_linux_cvmxregset (gdbarch); + fetch_regset (regcache, tid, NT_PPC_TM_CVMX, + PPC_LINUX_SIZEOF_CVMXREGSET, + cvmxregset); + } + if (tdep->have_htm_vsx) + fetch_regset (regcache, tid, NT_PPC_TM_CVSX, + PPC_LINUX_SIZEOF_CVSXREGSET, + &ppc32_linux_cvsxregset); + if (tdep->ppc_cppr_regnum != -1) + fetch_regset (regcache, tid, NT_PPC_TM_CPPR, + PPC_LINUX_SIZEOF_CPPRREGSET, + &ppc32_linux_cpprregset); + if (tdep->ppc_cdscr_regnum != -1) + fetch_regset (regcache, tid, NT_PPC_TM_CDSCR, + PPC_LINUX_SIZEOF_CDSCRREGSET, + &ppc32_linux_cdscrregset); + if (tdep->ppc_ctar_regnum != -1) + fetch_regset (regcache, tid, NT_PPC_TM_CTAR, + PPC_LINUX_SIZEOF_CTARREGSET, + &ppc32_linux_ctarregset); } /* Fetch registers from the child process. Fetch all registers if regno == -1, otherwise fetch all general registers or all floating point registers depending upon the value of regno. */ -static void -ppc_linux_fetch_inferior_registers (struct regcache *regcache, int regno) +void +ppc_linux_nat_target::fetch_registers (struct regcache *regcache, int regno) { - /* Overload thread id onto process id */ - int tid = TIDGET (inferior_ptid); - - /* No thread id, just use process id */ - if (tid == 0) - tid = PIDGET (inferior_ptid); + pid_t tid = get_ptrace_pid (regcache->ptid ()); if (regno == -1) fetch_ppc_registers (regcache, tid); @@ -504,15 +1031,40 @@ ppc_linux_fetch_inferior_registers (struct regcache *regcache, int regno) fetch_register (regcache, tid, regno); } -/* Store one register. */ static void -store_altivec_register (const struct regcache *regcache, int tid, int regno) +store_vsx_registers (const struct regcache *regcache, int tid, int regno) +{ + int ret; + gdb_vsxregset_t regs; + const struct regset *vsxregset = ppc_linux_vsxregset (); + + ret = ptrace (PTRACE_GETVSXREGS, tid, 0, ®s); + if (ret < 0) + { + if (errno == EIO) + { + have_ptrace_getsetvsxregs = 0; + return; + } + perror_with_name (_("Unable to fetch VSX registers")); + } + + vsxregset->collect_regset (vsxregset, regcache, regno, ®s, + PPC_LINUX_SIZEOF_VSXREGSET); + + ret = ptrace (PTRACE_SETVSXREGS, tid, 0, ®s); + if (ret < 0) + perror_with_name (_("Unable to store VSX registers")); +} + +static void +store_altivec_registers (const struct regcache *regcache, int tid, + int regno) { int ret; - int offset = 0; gdb_vrregset_t regs; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - int vrregsize = register_size (current_gdbarch, tdep->ppc_vr0_regnum); + struct gdbarch *gdbarch = regcache->arch (); + const struct regset *vrregset = ppc_linux_vrregset (gdbarch); ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) @@ -522,23 +1074,18 @@ store_altivec_register (const struct regcache *regcache, int tid, int regno) have_ptrace_getvrregs = 0; return; } - perror_with_name (_("Unable to fetch AltiVec register")); + perror_with_name (_("Unable to fetch AltiVec registers")); } - /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes - long on the hardware. */ - if (regno == (tdep->ppc_vrsave_regnum - 1)) - offset = vrregsize - register_size (current_gdbarch, tdep->ppc_vrsave_regnum); - - regcache_raw_collect (regcache, regno, - regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset); + vrregset->collect_regset (vrregset, regcache, regno, ®s, + PPC_LINUX_SIZEOF_VRREGSET); ret = ptrace (PTRACE_SETVRREGS, tid, 0, ®s); if (ret < 0) - perror_with_name (_("Unable to store AltiVec register")); + perror_with_name (_("Unable to store AltiVec registers")); } -/* Assuming TID referrs to an SPE process, set the top halves of TID's +/* Assuming TID refers to an SPE process, set the top halves of TID's general-purpose registers and its SPE-specific registers to the values in EVRREGSET. If we don't support PTRACE_SETEVRREGS, do nothing. @@ -573,15 +1120,16 @@ set_spe_registers (int tid, struct gdb_evrregset_t *evrregset) static void store_spe_register (const struct regcache *regcache, int tid, int regno) { - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); struct gdb_evrregset_t evrregs; gdb_assert (sizeof (evrregs.evr[0]) - == register_size (current_gdbarch, tdep->ppc_ev0_upper_regnum)); + == register_size (gdbarch, tdep->ppc_ev0_upper_regnum)); gdb_assert (sizeof (evrregs.acc) - == register_size (current_gdbarch, tdep->ppc_acc_regnum)); + == register_size (gdbarch, tdep->ppc_acc_regnum)); gdb_assert (sizeof (evrregs.spefscr) - == register_size (current_gdbarch, tdep->ppc_spefscr_regnum)); + == register_size (gdbarch, tdep->ppc_spefscr_regnum)); if (regno == -1) /* Since we're going to write out every register, the code below @@ -599,26 +1147,23 @@ store_spe_register (const struct regcache *regcache, int tid, int regno) int i; for (i = 0; i < ppc_num_gprs; i++) - regcache_raw_collect (regcache, - tdep->ppc_ev0_upper_regnum + i, - &evrregs.evr[i]); + regcache->raw_collect (tdep->ppc_ev0_upper_regnum + i, + &evrregs.evr[i]); } else if (tdep->ppc_ev0_upper_regnum <= regno && regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs) - regcache_raw_collect (regcache, regno, - &evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]); + regcache->raw_collect (regno, + &evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]); if (regno == -1 || regno == tdep->ppc_acc_regnum) - regcache_raw_collect (regcache, - tdep->ppc_acc_regnum, - &evrregs.acc); + regcache->raw_collect (tdep->ppc_acc_regnum, + &evrregs.acc); if (regno == -1 || regno == tdep->ppc_spefscr_regnum) - regcache_raw_collect (regcache, - tdep->ppc_spefscr_regnum, - &evrregs.spefscr); + regcache->raw_collect (tdep->ppc_spefscr_regnum, + &evrregs.spefscr); /* Write back the modified register set. */ set_spe_registers (tid, &evrregs); @@ -627,127 +1172,334 @@ store_spe_register (const struct regcache *regcache, int tid, int regno) static void store_register (const struct regcache *regcache, int tid, int regno) { - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* This isn't really an address. But ptrace thinks of it as one. */ - CORE_ADDR regaddr = ppc_register_u_addr (regno); + CORE_ADDR regaddr = ppc_register_u_addr (gdbarch, regno); int i; size_t bytes_to_transfer; - char buf[MAX_REGISTER_SIZE]; + gdb_byte buf[PPC_MAX_REGISTER_SIZE]; - if (altivec_register_p (regno)) + if (altivec_register_p (gdbarch, regno)) { - store_altivec_register (regcache, tid, regno); + store_altivec_registers (regcache, tid, regno); return; } - else if (spe_register_p (regno)) + else if (vsx_register_p (gdbarch, regno)) + { + store_vsx_registers (regcache, tid, regno); + return; + } + else if (spe_register_p (gdbarch, regno)) { store_spe_register (regcache, tid, regno); return; } + else if (regno == PPC_DSCR_REGNUM) + { + gdb_assert (tdep->ppc_dscr_regnum != -1); - if (regaddr == -1) - return; + store_regset (regcache, tid, regno, NT_PPC_DSCR, + PPC_LINUX_SIZEOF_DSCRREGSET, + &ppc32_linux_dscrregset); + return; + } + else if (regno == PPC_PPR_REGNUM) + { + gdb_assert (tdep->ppc_ppr_regnum != -1); - /* First collect the register. Keep in mind that the regcache's - idea of the register's size may not be a multiple of sizeof - (long). */ - memset (buf, 0, sizeof buf); - bytes_to_transfer = align_up (register_size (current_gdbarch, regno), - sizeof (long)); - if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_LITTLE) + store_regset (regcache, tid, regno, NT_PPC_PPR, + PPC_LINUX_SIZEOF_PPRREGSET, + &ppc32_linux_pprregset); + return; + } + else if (regno == PPC_TAR_REGNUM) { - /* Little-endian values always sit at the left end of the buffer. */ - regcache_raw_collect (regcache, regno, buf); + gdb_assert (tdep->ppc_tar_regnum != -1); + + store_regset (regcache, tid, regno, NT_PPC_TAR, + PPC_LINUX_SIZEOF_TARREGSET, + &ppc32_linux_tarregset); + return; } - else if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG) + else if (PPC_IS_EBB_REGNUM (regno)) { - /* Big-endian values sit at the right end of the buffer. */ - size_t padding = (bytes_to_transfer - - register_size (current_gdbarch, regno)); - regcache_raw_collect (regcache, regno, buf + padding); + gdb_assert (tdep->have_ebb); + + store_regset (regcache, tid, regno, NT_PPC_EBB, + PPC_LINUX_SIZEOF_EBBREGSET, + &ppc32_linux_ebbregset); + return; } + else if (PPC_IS_PMU_REGNUM (regno)) + { + gdb_assert (tdep->ppc_mmcr0_regnum != -1); - for (i = 0; i < bytes_to_transfer; i += sizeof (long)) + store_regset (regcache, tid, regno, NT_PPC_PMU, + PPC_LINUX_SIZEOF_PMUREGSET, + &ppc32_linux_pmuregset); + return; + } + else if (PPC_IS_TMSPR_REGNUM (regno)) { - errno = 0; - ptrace (PTRACE_POKEUSER, tid, (PTRACE_TYPE_ARG3) regaddr, - *(long *) &buf[i]); - regaddr += sizeof (long); + gdb_assert (tdep->have_htm_spr); - if (errno == EIO - && regno == tdep->ppc_fpscr_regnum) + store_regset (regcache, tid, regno, NT_PPC_TM_SPR, + PPC_LINUX_SIZEOF_TM_SPRREGSET, + &ppc32_linux_tm_sprregset); + return; + } + else if (PPC_IS_CKPTGP_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_core); + + const struct regset *cgprregset = ppc_linux_cgprregset (gdbarch); + store_regset (regcache, tid, regno, NT_PPC_TM_CGPR, + (tdep->wordsize == 4? + PPC32_LINUX_SIZEOF_CGPRREGSET + : PPC64_LINUX_SIZEOF_CGPRREGSET), + cgprregset); + return; + } + else if (PPC_IS_CKPTFP_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_fpu); + + store_regset (regcache, tid, regno, NT_PPC_TM_CFPR, + PPC_LINUX_SIZEOF_CFPRREGSET, + &ppc32_linux_cfprregset); + return; + } + else if (PPC_IS_CKPTVMX_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_altivec); + + const struct regset *cvmxregset = ppc_linux_cvmxregset (gdbarch); + store_regset (regcache, tid, regno, NT_PPC_TM_CVMX, + PPC_LINUX_SIZEOF_CVMXREGSET, + cvmxregset); + return; + } + else if (PPC_IS_CKPTVSX_REGNUM (regno)) + { + gdb_assert (tdep->have_htm_vsx); + + store_regset (regcache, tid, regno, NT_PPC_TM_CVSX, + PPC_LINUX_SIZEOF_CVSXREGSET, + &ppc32_linux_cvsxregset); + return; + } + else if (regno == PPC_CPPR_REGNUM) + { + gdb_assert (tdep->ppc_cppr_regnum != -1); + + store_regset (regcache, tid, regno, NT_PPC_TM_CPPR, + PPC_LINUX_SIZEOF_CPPRREGSET, + &ppc32_linux_cpprregset); + return; + } + else if (regno == PPC_CDSCR_REGNUM) + { + gdb_assert (tdep->ppc_cdscr_regnum != -1); + + store_regset (regcache, tid, regno, NT_PPC_TM_CDSCR, + PPC_LINUX_SIZEOF_CDSCRREGSET, + &ppc32_linux_cdscrregset); + return; + } + else if (regno == PPC_CTAR_REGNUM) + { + gdb_assert (tdep->ppc_ctar_regnum != -1); + + store_regset (regcache, tid, regno, NT_PPC_TM_CTAR, + PPC_LINUX_SIZEOF_CTARREGSET, + &ppc32_linux_ctarregset); + return; + } + + if (regaddr == -1) + return; + + /* First collect the register. Keep in mind that the regcache's + idea of the register's size may not be a multiple of sizeof + (long). */ + memset (buf, 0, sizeof buf); + bytes_to_transfer = align_up (register_size (gdbarch, regno), sizeof (long)); + if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) + { + /* Little-endian values always sit at the left end of the buffer. */ + regcache->raw_collect (regno, buf); + } + else if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) + { + /* Big-endian values sit at the right end of the buffer. */ + size_t padding = (bytes_to_transfer - register_size (gdbarch, regno)); + regcache->raw_collect (regno, buf + padding); + } + + for (i = 0; i < bytes_to_transfer; i += sizeof (long)) + { + long l; + + memcpy (&l, &buf[i], sizeof (l)); + errno = 0; + ptrace (PTRACE_POKEUSER, tid, (PTRACE_TYPE_ARG3) regaddr, l); + regaddr += sizeof (long); + + if (errno == EIO + && (regno == tdep->ppc_fpscr_regnum + || regno == PPC_ORIG_R3_REGNUM + || regno == PPC_TRAP_REGNUM)) { - /* Some older kernel versions don't allow fpscr to be written. */ + /* Some older kernel versions don't allow fpscr, orig_r3 + or trap to be written. */ continue; } if (errno != 0) { char message[128]; - sprintf (message, "writing register %s (#%d)", - REGISTER_NAME (regno), regno); + xsnprintf (message, sizeof (message), "writing register %s (#%d)", + gdbarch_register_name (gdbarch, regno), regno); perror_with_name (message); } } } -static void -fill_vrregset (const struct regcache *regcache, gdb_vrregset_t *vrregsetp) +/* This function actually issues the request to ptrace, telling + it to store all general-purpose registers present in the specified + regset. + + If the ptrace request does not exist, this function returns 0 + and properly sets the have_ptrace_* flag. If the request fails, + this function calls perror_with_name. Otherwise, if the request + succeeds, then the regcache is stored and 1 is returned. */ +static int +store_all_gp_regs (const struct regcache *regcache, int tid, int regno) { - int i; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1; - int vrregsize = register_size (current_gdbarch, tdep->ppc_vr0_regnum); - int offset = vrregsize - register_size (current_gdbarch, tdep->ppc_vrsave_regnum); - - for (i = 0; i < num_of_vrregs; i++) - { - /* The last 2 registers of this set are only 32 bit long, not - 128, but only VSCR is fetched as a 16 bytes quantity. */ - if (i == (num_of_vrregs - 2)) - regcache_raw_collect (regcache, tdep->ppc_vr0_regnum + i, - *vrregsetp + i * vrregsize + offset); - else - regcache_raw_collect (regcache, tdep->ppc_vr0_regnum + i, - *vrregsetp + i * vrregsize); + gdb_gregset_t gregset; + + if (ptrace (PTRACE_GETREGS, tid, 0, (void *) &gregset) < 0) + { + if (errno == EIO) + { + have_ptrace_getsetregs = 0; + return 0; + } + perror_with_name (_("Couldn't get general-purpose registers.")); } + + fill_gregset (regcache, &gregset, regno); + + if (ptrace (PTRACE_SETREGS, tid, 0, (void *) &gregset) < 0) + { + if (errno == EIO) + { + have_ptrace_getsetregs = 0; + return 0; + } + perror_with_name (_("Couldn't set general-purpose registers.")); + } + + return 1; } +/* This is a wrapper for the store_all_gp_regs function. It is + responsible for verifying if this target has the ptrace request + that can be used to store all general-purpose registers at one + shot. If it doesn't, then we should store them using the + old-fashioned way, which is to iterate over the registers and + store them one by one. */ static void -store_altivec_registers (const struct regcache *regcache, int tid) +store_gp_regs (const struct regcache *regcache, int tid, int regno) { - int ret; - gdb_vrregset_t regs; + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + int i; - ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); - if (ret < 0) + if (have_ptrace_getsetregs) + if (store_all_gp_regs (regcache, tid, regno)) + return; + + /* If we hit this point, it doesn't really matter which + architecture we are using. We just need to store the + registers in the "old-fashioned way". */ + for (i = 0; i < ppc_num_gprs; i++) + store_register (regcache, tid, tdep->ppc_gp0_regnum + i); +} + +/* This function actually issues the request to ptrace, telling + it to store all floating-point registers present in the specified + regset. + + If the ptrace request does not exist, this function returns 0 + and properly sets the have_ptrace_* flag. If the request fails, + this function calls perror_with_name. Otherwise, if the request + succeeds, then the regcache is stored and 1 is returned. */ +static int +store_all_fp_regs (const struct regcache *regcache, int tid, int regno) +{ + gdb_fpregset_t fpregs; + + if (ptrace (PTRACE_GETFPREGS, tid, 0, (void *) &fpregs) < 0) { if (errno == EIO) { - have_ptrace_getvrregs = 0; - return; + have_ptrace_getsetfpregs = 0; + return 0; } - perror_with_name (_("Couldn't get AltiVec registers")); + perror_with_name (_("Couldn't get floating-point registers.")); } - fill_vrregset (regcache, ®s); - - if (ptrace (PTRACE_SETVRREGS, tid, 0, ®s) < 0) - perror_with_name (_("Couldn't write AltiVec registers")); + fill_fpregset (regcache, &fpregs, regno); + + if (ptrace (PTRACE_SETFPREGS, tid, 0, (void *) &fpregs) < 0) + { + if (errno == EIO) + { + have_ptrace_getsetfpregs = 0; + return 0; + } + perror_with_name (_("Couldn't set floating-point registers.")); + } + + return 1; } +/* This is a wrapper for the store_all_fp_regs function. It is + responsible for verifying if this target has the ptrace request + that can be used to store all floating-point registers at one + shot. If it doesn't, then we should store them using the + old-fashioned way, which is to iterate over the registers and + store them one by one. */ static void -store_ppc_registers (const struct regcache *regcache, int tid) +store_fp_regs (const struct regcache *regcache, int tid, int regno) { + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int i; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - - for (i = 0; i < ppc_num_gprs; i++) - store_register (regcache, tid, tdep->ppc_gp0_regnum + i); + + if (have_ptrace_getsetfpregs) + if (store_all_fp_regs (regcache, tid, regno)) + return; + + /* If we hit this point, it doesn't really matter which + architecture we are using. We just need to store the + registers in the "old-fashioned way". */ + for (i = 0; i < ppc_num_fprs; i++) + store_register (regcache, tid, tdep->ppc_fp0_regnum + i); +} + +static void +store_ppc_registers (const struct regcache *regcache, int tid) +{ + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + store_gp_regs (regcache, tid, -1); if (tdep->ppc_fp0_regnum >= 0) - for (i = 0; i < ppc_num_fprs; i++) - store_register (regcache, tid, tdep->ppc_fp0_regnum + i); - store_register (regcache, tid, PC_REGNUM); + store_fp_regs (regcache, tid, -1); + store_register (regcache, tid, gdbarch_pc_regnum (gdbarch)); if (tdep->ppc_ps_regnum != -1) store_register (regcache, tid, tdep->ppc_ps_regnum); if (tdep->ppc_cr_regnum != -1) @@ -762,265 +1514,1170 @@ store_ppc_registers (const struct regcache *regcache, int tid) store_register (regcache, tid, tdep->ppc_mq_regnum); if (tdep->ppc_fpscr_regnum != -1) store_register (regcache, tid, tdep->ppc_fpscr_regnum); + if (ppc_linux_trap_reg_p (gdbarch)) + { + store_register (regcache, tid, PPC_ORIG_R3_REGNUM); + store_register (regcache, tid, PPC_TRAP_REGNUM); + } if (have_ptrace_getvrregs) if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) - store_altivec_registers (regcache, tid); + store_altivec_registers (regcache, tid, -1); + if (have_ptrace_getsetvsxregs) + if (tdep->ppc_vsr0_upper_regnum != -1) + store_vsx_registers (regcache, tid, -1); if (tdep->ppc_ev0_upper_regnum >= 0) store_spe_register (regcache, tid, -1); + if (tdep->ppc_ppr_regnum != -1) + store_regset (regcache, tid, -1, NT_PPC_PPR, + PPC_LINUX_SIZEOF_PPRREGSET, + &ppc32_linux_pprregset); + if (tdep->ppc_dscr_regnum != -1) + store_regset (regcache, tid, -1, NT_PPC_DSCR, + PPC_LINUX_SIZEOF_DSCRREGSET, + &ppc32_linux_dscrregset); + if (tdep->ppc_tar_regnum != -1) + store_regset (regcache, tid, -1, NT_PPC_TAR, + PPC_LINUX_SIZEOF_TARREGSET, + &ppc32_linux_tarregset); + + if (tdep->ppc_mmcr0_regnum != -1) + store_regset (regcache, tid, -1, NT_PPC_PMU, + PPC_LINUX_SIZEOF_PMUREGSET, + &ppc32_linux_pmuregset); + + if (tdep->have_htm_spr) + store_regset (regcache, tid, -1, NT_PPC_TM_SPR, + PPC_LINUX_SIZEOF_TM_SPRREGSET, + &ppc32_linux_tm_sprregset); + + /* Because the EBB and checkpointed HTM registers can be + unavailable, attempts to store them here would cause this + function to fail most of the time, so we ignore them. */ } +/* The cached DABR value, to install in new threads. + This variable is used when the PowerPC HWDEBUG ptrace + interface is not available. */ +static long saved_dabr_value; + +/* Global structure that will store information about the available + features provided by the PowerPC HWDEBUG ptrace interface. */ +static struct ppc_debug_info hwdebug_info; + +/* Global variable that holds the maximum number of slots that the + kernel will use. This is only used when PowerPC HWDEBUG ptrace interface + is available. */ +static size_t max_slots_number = 0; + +struct hw_break_tuple +{ + long slot; + struct ppc_hw_breakpoint *hw_break; +}; + +/* This is an internal vector created to store information about *points + inserted for each thread. This is used when PowerPC HWDEBUG ptrace + interface is available. */ +struct thread_points + { + /* The TID to which this *point relates. */ + int tid; + /* Information about the *point, such as its address, type, etc. + + Each element inside this vector corresponds to a hardware + breakpoint or watchpoint in the thread represented by TID. The maximum + size of these vector is MAX_SLOTS_NUMBER. If the hw_break element of + the tuple is NULL, then the position in the vector is free. */ + struct hw_break_tuple *hw_breaks; + }; + +static std::vector ppc_threads; + +/* The version of the PowerPC HWDEBUG kernel interface that we will use, if + available. */ +#define PPC_DEBUG_CURRENT_VERSION 1 + +/* Returns non-zero if we support the PowerPC HWDEBUG ptrace interface. */ static int -ppc_linux_check_watch_resources (int type, int cnt, int ot) +have_ptrace_hwdebug_interface (void) { - int tid; - ptid_t ptid = inferior_ptid; + static int have_ptrace_hwdebug_interface = -1; - /* DABR (data address breakpoint register) is optional for PPC variants. - Some variants have one DABR, others have none. So CNT can't be larger - than 1. */ - if (cnt > 1) - return 0; + if (have_ptrace_hwdebug_interface == -1) + { + int tid; - /* We need to know whether ptrace supports PTRACE_SET_DEBUGREG and whether - the target has DABR. If either answer is no, the ptrace call will - return -1. Fail in that case. */ - tid = TIDGET (ptid); - if (tid == 0) - tid = PIDGET (ptid); + tid = inferior_ptid.lwp (); + if (tid == 0) + tid = inferior_ptid.pid (); + + /* Check for kernel support for PowerPC HWDEBUG ptrace interface. */ + if (ptrace (PPC_PTRACE_GETHWDBGINFO, tid, 0, &hwdebug_info) >= 0) + { + /* Check whether PowerPC HWDEBUG ptrace interface is functional and + provides any supported feature. */ + if (hwdebug_info.features != 0) + { + have_ptrace_hwdebug_interface = 1; + max_slots_number = hwdebug_info.num_instruction_bps + + hwdebug_info.num_data_bps + + hwdebug_info.num_condition_regs; + return have_ptrace_hwdebug_interface; + } + } + /* Old school interface and no PowerPC HWDEBUG ptrace support. */ + have_ptrace_hwdebug_interface = 0; + memset (&hwdebug_info, 0, sizeof (struct ppc_debug_info)); + } + + return have_ptrace_hwdebug_interface; +} + +int +ppc_linux_nat_target::can_use_hw_breakpoint (enum bptype type, int cnt, int ot) +{ + int total_hw_wp, total_hw_bp; + + if (have_ptrace_hwdebug_interface ()) + { + /* When PowerPC HWDEBUG ptrace interface is available, the number of + available hardware watchpoints and breakpoints is stored at the + hwdebug_info struct. */ + total_hw_bp = hwdebug_info.num_instruction_bps; + total_hw_wp = hwdebug_info.num_data_bps; + } + else + { + /* When we do not have PowerPC HWDEBUG ptrace interface, we should + consider having 1 hardware watchpoint and no hardware breakpoints. */ + total_hw_bp = 0; + total_hw_wp = 1; + } + + if (type == bp_hardware_watchpoint || type == bp_read_watchpoint + || type == bp_access_watchpoint || type == bp_watchpoint) + { + if (cnt + ot > total_hw_wp) + return -1; + } + else if (type == bp_hardware_breakpoint) + { + if (total_hw_bp == 0) + { + /* No hardware breakpoint support. */ + return 0; + } + if (cnt > total_hw_bp) + return -1; + } + + if (!have_ptrace_hwdebug_interface ()) + { + int tid; + ptid_t ptid = inferior_ptid; + + /* We need to know whether ptrace supports PTRACE_SET_DEBUGREG + and whether the target has DABR. If either answer is no, the + ptrace call will return -1. Fail in that case. */ + tid = ptid.lwp (); + if (tid == 0) + tid = ptid.pid (); + + if (ptrace (PTRACE_SET_DEBUGREG, tid, 0, 0) == -1) + return 0; + } - if (ptrace (PTRACE_SET_DEBUGREG, tid, 0, 0) == -1) - return 0; return 1; } -static int -ppc_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) +int +ppc_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) { /* Handle sub-8-byte quantities. */ if (len <= 0) return 0; - /* addr+len must fall in the 8 byte watchable region. */ - if ((addr + len) > (addr & ~7) + 8) + /* The PowerPC HWDEBUG ptrace interface tells if there are alignment + restrictions for watchpoints in the processors. In that case, we use that + information to determine the hardcoded watchable region for + watchpoints. */ + if (have_ptrace_hwdebug_interface ()) + { + int region_size; + /* Embedded DAC-based processors, like the PowerPC 440 have ranged + watchpoints and can watch any access within an arbitrary memory + region. This is useful to watch arrays and structs, for instance. It + takes two hardware watchpoints though. */ + if (len > 1 + && hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_RANGE + && linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) + return 2; + /* Check if the processor provides DAWR interface. */ + if (hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_DAWR) + /* DAWR interface allows to watch up to 512 byte wide ranges which + can't cross a 512 byte boundary. */ + region_size = 512; + else + region_size = hwdebug_info.data_bp_alignment; + /* Server processors provide one hardware watchpoint and addr+len should + fall in the watchable region provided by the ptrace interface. */ + if (region_size + && (addr + len > (addr & ~(region_size - 1)) + region_size)) + return 0; + } + /* addr+len must fall in the 8 byte watchable region for DABR-based + processors (i.e., server processors). Without the new PowerPC HWDEBUG + ptrace interface, DAC-based processors (i.e., embedded processors) will + use addresses aligned to 4-bytes due to the way the read/write flags are + passed in the old ptrace interface. */ + else if (((linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) + && (addr + len) > (addr & ~3) + 4) + || (addr + len) > (addr & ~7) + 8) return 0; return 1; } -/* Set a watchpoint of type TYPE at address ADDR. */ +/* This function compares two ppc_hw_breakpoint structs field-by-field. */ static int -ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw) +hwdebug_point_cmp (struct ppc_hw_breakpoint *a, struct ppc_hw_breakpoint *b) { - int tid; - long dabr_value; - ptid_t ptid = inferior_ptid; + return (a->trigger_type == b->trigger_type + && a->addr_mode == b->addr_mode + && a->condition_mode == b->condition_mode + && a->addr == b->addr + && a->addr2 == b->addr2 + && a->condition_value == b->condition_value); +} - dabr_value = addr & ~7; - switch (rw) +/* This function can be used to retrieve a thread_points by the TID of the + related process/thread. If nothing has been found, and ALLOC_NEW is 0, + it returns NULL. If ALLOC_NEW is non-zero, a new thread_points for the + provided TID will be created and returned. */ +static struct thread_points * +hwdebug_find_thread_points_by_tid (int tid, int alloc_new) +{ + for (thread_points *t : ppc_threads) { - case hw_read: - /* Set read and translate bits. */ - dabr_value |= 5; - break; - case hw_write: - /* Set write and translate bits. */ - dabr_value |= 6; - break; - case hw_access: - /* Set read, write and translate bits. */ - dabr_value |= 7; + if (t->tid == tid) + return t; + } + + struct thread_points *t = NULL; + + /* Do we need to allocate a new point_item + if the wanted one does not exist? */ + if (alloc_new) + { + t = XNEW (struct thread_points); + t->hw_breaks = XCNEWVEC (struct hw_break_tuple, max_slots_number); + t->tid = tid; + ppc_threads.push_back (t); + } + + return t; +} + +/* This function is a generic wrapper that is responsible for inserting a + *point (i.e., calling `ptrace' in order to issue the request to the + kernel) and registering it internally in GDB. */ +static void +hwdebug_insert_point (struct ppc_hw_breakpoint *b, int tid) +{ + int i; + long slot; + gdb::unique_xmalloc_ptr p (XDUP (ppc_hw_breakpoint, b)); + struct hw_break_tuple *hw_breaks; + struct thread_points *t; + + errno = 0; + slot = ptrace (PPC_PTRACE_SETHWDEBUG, tid, 0, p.get ()); + if (slot < 0) + perror_with_name (_("Unexpected error setting breakpoint or watchpoint")); + + /* Everything went fine, so we have to register this *point. */ + t = hwdebug_find_thread_points_by_tid (tid, 1); + gdb_assert (t != NULL); + hw_breaks = t->hw_breaks; + + /* Find a free element in the hw_breaks vector. */ + for (i = 0; i < max_slots_number; i++) + { + if (hw_breaks[i].hw_break == NULL) + { + hw_breaks[i].slot = slot; + hw_breaks[i].hw_break = p.release (); + break; + } + } + + gdb_assert (i != max_slots_number); +} + +/* This function is a generic wrapper that is responsible for removing a + *point (i.e., calling `ptrace' in order to issue the request to the + kernel), and unregistering it internally at GDB. */ +static void +hwdebug_remove_point (struct ppc_hw_breakpoint *b, int tid) +{ + int i; + struct hw_break_tuple *hw_breaks; + struct thread_points *t; + + t = hwdebug_find_thread_points_by_tid (tid, 0); + gdb_assert (t != NULL); + hw_breaks = t->hw_breaks; + + for (i = 0; i < max_slots_number; i++) + if (hw_breaks[i].hw_break && hwdebug_point_cmp (hw_breaks[i].hw_break, b)) break; + + gdb_assert (i != max_slots_number); + + /* We have to ignore ENOENT errors because the kernel implements hardware + breakpoints/watchpoints as "one-shot", that is, they are automatically + deleted when hit. */ + errno = 0; + if (ptrace (PPC_PTRACE_DELHWDEBUG, tid, 0, hw_breaks[i].slot) < 0) + if (errno != ENOENT) + perror_with_name (_("Unexpected error deleting " + "breakpoint or watchpoint")); + + xfree (hw_breaks[i].hw_break); + hw_breaks[i].hw_break = NULL; +} + +/* Return the number of registers needed for a ranged breakpoint. */ + +int +ppc_linux_nat_target::ranged_break_num_registers () +{ + return ((have_ptrace_hwdebug_interface () + && hwdebug_info.features & PPC_DEBUG_FEATURE_INSN_BP_RANGE)? + 2 : -1); +} + +/* Insert the hardware breakpoint described by BP_TGT. Returns 0 for + success, 1 if hardware breakpoints are not supported or -1 for failure. */ + +int +ppc_linux_nat_target::insert_hw_breakpoint (struct gdbarch *gdbarch, + struct bp_target_info *bp_tgt) +{ + struct lwp_info *lp; + struct ppc_hw_breakpoint p; + + if (!have_ptrace_hwdebug_interface ()) + return -1; + + p.version = PPC_DEBUG_CURRENT_VERSION; + p.trigger_type = PPC_BREAKPOINT_TRIGGER_EXECUTE; + p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + p.addr = (uint64_t) (bp_tgt->placed_address = bp_tgt->reqstd_address); + p.condition_value = 0; + + if (bp_tgt->length) + { + p.addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE; + + /* The breakpoint will trigger if the address of the instruction is + within the defined range, as follows: p.addr <= address < p.addr2. */ + p.addr2 = (uint64_t) bp_tgt->placed_address + bp_tgt->length; + } + else + { + p.addr_mode = PPC_BREAKPOINT_MODE_EXACT; + p.addr2 = 0; } - tid = TIDGET (ptid); - if (tid == 0) - tid = PIDGET (ptid); + ALL_LWPS (lp) + hwdebug_insert_point (&p, lp->ptid.lwp ()); + + return 0; +} + +int +ppc_linux_nat_target::remove_hw_breakpoint (struct gdbarch *gdbarch, + struct bp_target_info *bp_tgt) +{ + struct lwp_info *lp; + struct ppc_hw_breakpoint p; + + if (!have_ptrace_hwdebug_interface ()) + return -1; + + p.version = PPC_DEBUG_CURRENT_VERSION; + p.trigger_type = PPC_BREAKPOINT_TRIGGER_EXECUTE; + p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + p.addr = (uint64_t) bp_tgt->placed_address; + p.condition_value = 0; + + if (bp_tgt->length) + { + p.addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE; - return ptrace (PTRACE_SET_DEBUGREG, tid, 0, dabr_value); + /* The breakpoint will trigger if the address of the instruction is within + the defined range, as follows: p.addr <= address < p.addr2. */ + p.addr2 = (uint64_t) bp_tgt->placed_address + bp_tgt->length; + } + else + { + p.addr_mode = PPC_BREAKPOINT_MODE_EXACT; + p.addr2 = 0; + } + + ALL_LWPS (lp) + hwdebug_remove_point (&p, lp->ptid.lwp ()); + + return 0; } static int -ppc_linux_remove_watchpoint (CORE_ADDR addr, int len, int rw) +get_trigger_type (enum target_hw_bp_type type) { - int tid; - ptid_t ptid = inferior_ptid; + int t; - tid = TIDGET (ptid); - if (tid == 0) - tid = PIDGET (ptid); + if (type == hw_read) + t = PPC_BREAKPOINT_TRIGGER_READ; + else if (type == hw_write) + t = PPC_BREAKPOINT_TRIGGER_WRITE; + else + t = PPC_BREAKPOINT_TRIGGER_READ | PPC_BREAKPOINT_TRIGGER_WRITE; + + return t; +} + +/* Insert a new masked watchpoint at ADDR using the mask MASK. + RW may be hw_read for a read watchpoint, hw_write for a write watchpoint + or hw_access for an access watchpoint. Returns 0 on success and throws + an error on failure. */ + +int +ppc_linux_nat_target::insert_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, + target_hw_bp_type rw) +{ + struct lwp_info *lp; + struct ppc_hw_breakpoint p; + + gdb_assert (have_ptrace_hwdebug_interface ()); + + p.version = PPC_DEBUG_CURRENT_VERSION; + p.trigger_type = get_trigger_type (rw); + p.addr_mode = PPC_BREAKPOINT_MODE_MASK; + p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + p.addr = addr; + p.addr2 = mask; + p.condition_value = 0; + + ALL_LWPS (lp) + hwdebug_insert_point (&p, lp->ptid.lwp ()); + + return 0; +} + +/* Remove a masked watchpoint at ADDR with the mask MASK. + RW may be hw_read for a read watchpoint, hw_write for a write watchpoint + or hw_access for an access watchpoint. Returns 0 on success and throws + an error on failure. */ - return ptrace (PTRACE_SET_DEBUGREG, tid, 0, 0); +int +ppc_linux_nat_target::remove_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, + target_hw_bp_type rw) +{ + struct lwp_info *lp; + struct ppc_hw_breakpoint p; + + gdb_assert (have_ptrace_hwdebug_interface ()); + + p.version = PPC_DEBUG_CURRENT_VERSION; + p.trigger_type = get_trigger_type (rw); + p.addr_mode = PPC_BREAKPOINT_MODE_MASK; + p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + p.addr = addr; + p.addr2 = mask; + p.condition_value = 0; + + ALL_LWPS (lp) + hwdebug_remove_point (&p, lp->ptid.lwp ()); + + return 0; } +/* Check whether we have at least one free DVC register. */ static int -ppc_linux_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p) +can_use_watchpoint_cond_accel (void) { - if (last_stopped_data_address) + struct thread_points *p; + int tid = inferior_ptid.lwp (); + int cnt = hwdebug_info.num_condition_regs, i; + + if (!have_ptrace_hwdebug_interface () || cnt == 0) + return 0; + + p = hwdebug_find_thread_points_by_tid (tid, 0); + + if (p) { - *addr_p = last_stopped_data_address; - last_stopped_data_address = 0; - return 1; + for (i = 0; i < max_slots_number; i++) + if (p->hw_breaks[i].hw_break != NULL + && (p->hw_breaks[i].hw_break->condition_mode + != PPC_BREAKPOINT_CONDITION_NONE)) + cnt--; + + /* There are no available slots now. */ + if (cnt <= 0) + return 0; } - return 0; + + return 1; } +/* Calculate the enable bits and the contents of the Data Value Compare + debug register present in BookE processors. + + ADDR is the address to be watched, LEN is the length of watched data + and DATA_VALUE is the value which will trigger the watchpoint. + On exit, CONDITION_MODE will hold the enable bits for the DVC, and + CONDITION_VALUE will hold the value which should be put in the + DVC register. */ +static void +calculate_dvc (CORE_ADDR addr, int len, CORE_ADDR data_value, + uint32_t *condition_mode, uint64_t *condition_value) +{ + int i, num_byte_enable, align_offset, num_bytes_off_dvc, + rightmost_enabled_byte; + CORE_ADDR addr_end_data, addr_end_dvc; + + /* The DVC register compares bytes within fixed-length windows which + are word-aligned, with length equal to that of the DVC register. + We need to calculate where our watch region is relative to that + window and enable comparison of the bytes which fall within it. */ + + align_offset = addr % hwdebug_info.sizeof_condition; + addr_end_data = addr + len; + addr_end_dvc = (addr - align_offset + + hwdebug_info.sizeof_condition); + num_bytes_off_dvc = (addr_end_data > addr_end_dvc)? + addr_end_data - addr_end_dvc : 0; + num_byte_enable = len - num_bytes_off_dvc; + /* Here, bytes are numbered from right to left. */ + rightmost_enabled_byte = (addr_end_data < addr_end_dvc)? + addr_end_dvc - addr_end_data : 0; + + *condition_mode = PPC_BREAKPOINT_CONDITION_AND; + for (i = 0; i < num_byte_enable; i++) + *condition_mode + |= PPC_BREAKPOINT_CONDITION_BE (i + rightmost_enabled_byte); + + /* Now we need to match the position within the DVC of the comparison + value with where the watch region is relative to the window + (i.e., the ALIGN_OFFSET). */ + + *condition_value = ((uint64_t) data_value >> num_bytes_off_dvc * 8 + << rightmost_enabled_byte * 8); +} + +/* Return the number of memory locations that need to be accessed to + evaluate the expression which generated the given value chain. + Returns -1 if there's any register access involved, or if there are + other kinds of values which are not acceptable in a condition + expression (e.g., lval_computed or lval_internalvar). */ static int -ppc_linux_stopped_by_watchpoint (void) +num_memory_accesses (const std::vector &chain) { - int tid; - struct siginfo siginfo; - ptid_t ptid = inferior_ptid; - CORE_ADDR *addr_p; + int found_memory_cnt = 0; + + /* The idea here is that evaluating an expression generates a series + of values, one holding the value of every subexpression. (The + expression a*b+c has five subexpressions: a, b, a*b, c, and + a*b+c.) GDB's values hold almost enough information to establish + the criteria given above --- they identify memory lvalues, + register lvalues, computed values, etcetera. So we can evaluate + the expression, and then scan the chain of values that leaves + behind to determine the memory locations involved in the evaluation + of an expression. + + However, I don't think that the values returned by inferior + function calls are special in any way. So this function may not + notice that an expression contains an inferior function call. + FIXME. */ + + for (const value_ref_ptr &iter : chain) + { + struct value *v = iter.get (); - tid = TIDGET(ptid); - if (tid == 0) - tid = PIDGET (ptid); + /* Constants and values from the history are fine. */ + if (VALUE_LVAL (v) == not_lval || deprecated_value_modifiable (v) == 0) + continue; + else if (VALUE_LVAL (v) == lval_memory) + { + /* A lazy memory lvalue is one that GDB never needed to fetch; + we either just used its address (e.g., `a' in `a.b') or + we never needed it at all (e.g., `a' in `a,b'). */ + if (!value_lazy (v)) + found_memory_cnt++; + } + /* Other kinds of values are not fine. */ + else + return -1; + } - errno = 0; - ptrace (PTRACE_GETSIGINFO, tid, (PTRACE_TYPE_ARG3) 0, &siginfo); + return found_memory_cnt; +} + +/* Verifies whether the expression COND can be implemented using the + DVC (Data Value Compare) register in BookE processors. The expression + must test the watch value for equality with a constant expression. + If the function returns 1, DATA_VALUE will contain the constant against + which the watch value should be compared and LEN will contain the size + of the constant. */ +static int +check_condition (CORE_ADDR watch_addr, struct expression *cond, + CORE_ADDR *data_value, int *len) +{ + int pc = 1, num_accesses_left, num_accesses_right; + struct value *left_val, *right_val; + std::vector left_chain, right_chain; - if (errno != 0 || siginfo.si_signo != SIGTRAP || - (siginfo.si_code & 0xffff) != 0x0004) + if (cond->elts[0].opcode != BINOP_EQUAL) + return 0; + + fetch_subexp_value (cond, &pc, &left_val, NULL, &left_chain, 0); + num_accesses_left = num_memory_accesses (left_chain); + + if (left_val == NULL || num_accesses_left < 0) + return 0; + + fetch_subexp_value (cond, &pc, &right_val, NULL, &right_chain, 0); + num_accesses_right = num_memory_accesses (right_chain); + + if (right_val == NULL || num_accesses_right < 0) + return 0; + + if (num_accesses_left == 1 && num_accesses_right == 0 + && VALUE_LVAL (left_val) == lval_memory + && value_address (left_val) == watch_addr) + { + *data_value = value_as_long (right_val); + + /* DATA_VALUE is the constant in RIGHT_VAL, but actually has + the same type as the memory region referenced by LEFT_VAL. */ + *len = TYPE_LENGTH (check_typedef (value_type (left_val))); + } + else if (num_accesses_left == 0 && num_accesses_right == 1 + && VALUE_LVAL (right_val) == lval_memory + && value_address (right_val) == watch_addr) + { + *data_value = value_as_long (left_val); + + /* DATA_VALUE is the constant in LEFT_VAL, but actually has + the same type as the memory region referenced by RIGHT_VAL. */ + *len = TYPE_LENGTH (check_typedef (value_type (right_val))); + } + else return 0; - last_stopped_data_address = (uintptr_t) siginfo.si_addr; return 1; } +/* Return non-zero if the target is capable of using hardware to evaluate + the condition expression, thus only triggering the watchpoint when it is + true. */ +bool +ppc_linux_nat_target::can_accel_watchpoint_condition (CORE_ADDR addr, int len, + int rw, + struct expression *cond) +{ + CORE_ADDR data_value; + + return (have_ptrace_hwdebug_interface () + && hwdebug_info.num_condition_regs > 0 + && check_condition (addr, cond, &data_value, &len)); +} + +/* Set up P with the parameters necessary to request a watchpoint covering + LEN bytes starting at ADDR and if possible with condition expression COND + evaluated by hardware. INSERT tells if we are creating a request for + inserting or removing the watchpoint. */ + static void -ppc_linux_store_inferior_registers (struct regcache *regcache, int regno) +create_watchpoint_request (struct ppc_hw_breakpoint *p, CORE_ADDR addr, + int len, enum target_hw_bp_type type, + struct expression *cond, int insert) { - /* Overload thread id onto process id */ - int tid = TIDGET (inferior_ptid); + if (len == 1 + || !(hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_RANGE)) + { + int use_condition; + CORE_ADDR data_value; + + use_condition = (insert? can_use_watchpoint_cond_accel () + : hwdebug_info.num_condition_regs > 0); + if (cond && use_condition && check_condition (addr, cond, + &data_value, &len)) + calculate_dvc (addr, len, data_value, &p->condition_mode, + &p->condition_value); + else + { + p->condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + p->condition_value = 0; + } - /* No thread id, just use process id */ - if (tid == 0) - tid = PIDGET (inferior_ptid); + p->addr_mode = PPC_BREAKPOINT_MODE_EXACT; + p->addr2 = 0; + } + else + { + p->addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE; + p->condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + p->condition_value = 0; - if (regno >= 0) - store_register (regcache, tid, regno); + /* The watchpoint will trigger if the address of the memory access is + within the defined range, as follows: p->addr <= address < p->addr2. + + Note that the above sentence just documents how ptrace interprets + its arguments; the watchpoint is set to watch the range defined by + the user _inclusively_, as specified by the user interface. */ + p->addr2 = (uint64_t) addr + len; + } + + p->version = PPC_DEBUG_CURRENT_VERSION; + p->trigger_type = get_trigger_type (type); + p->addr = (uint64_t) addr; +} + +int +ppc_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len, + enum target_hw_bp_type type, + struct expression *cond) +{ + struct lwp_info *lp; + int ret = -1; + + if (have_ptrace_hwdebug_interface ()) + { + struct ppc_hw_breakpoint p; + + create_watchpoint_request (&p, addr, len, type, cond, 1); + + ALL_LWPS (lp) + hwdebug_insert_point (&p, lp->ptid.lwp ()); + + ret = 0; + } else - store_ppc_registers (regcache, tid); + { + long dabr_value; + long read_mode, write_mode; + + if (linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) + { + /* PowerPC 440 requires only the read/write flags to be passed + to the kernel. */ + read_mode = 1; + write_mode = 2; + } + else + { + /* PowerPC 970 and other DABR-based processors are required to pass + the Breakpoint Translation bit together with the flags. */ + read_mode = 5; + write_mode = 6; + } + + dabr_value = addr & ~(read_mode | write_mode); + switch (type) + { + case hw_read: + /* Set read and translate bits. */ + dabr_value |= read_mode; + break; + case hw_write: + /* Set write and translate bits. */ + dabr_value |= write_mode; + break; + case hw_access: + /* Set read, write and translate bits. */ + dabr_value |= read_mode | write_mode; + break; + } + + saved_dabr_value = dabr_value; + + ALL_LWPS (lp) + if (ptrace (PTRACE_SET_DEBUGREG, lp->ptid.lwp (), 0, + saved_dabr_value) < 0) + return -1; + + ret = 0; + } + + return ret; +} + +int +ppc_linux_nat_target::remove_watchpoint (CORE_ADDR addr, int len, + enum target_hw_bp_type type, + struct expression *cond) +{ + struct lwp_info *lp; + int ret = -1; + + if (have_ptrace_hwdebug_interface ()) + { + struct ppc_hw_breakpoint p; + + create_watchpoint_request (&p, addr, len, type, cond, 0); + + ALL_LWPS (lp) + hwdebug_remove_point (&p, lp->ptid.lwp ()); + + ret = 0; + } + else + { + saved_dabr_value = 0; + ALL_LWPS (lp) + if (ptrace (PTRACE_SET_DEBUGREG, lp->ptid.lwp (), 0, + saved_dabr_value) < 0) + return -1; + + ret = 0; + } + + return ret; } void -supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) +ppc_linux_nat_target::low_new_thread (struct lwp_info *lp) { - /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace - interface, and not the wordsize of the program's ABI. */ - int wordsize = sizeof (long); - ppc_linux_supply_gregset (regcache, -1, gregsetp, - sizeof (gdb_gregset_t), wordsize); + int tid = lp->ptid.lwp (); + + if (have_ptrace_hwdebug_interface ()) + { + int i; + struct thread_points *p; + struct hw_break_tuple *hw_breaks; + + if (ppc_threads.empty ()) + return; + + /* Get a list of breakpoints from any thread. */ + p = ppc_threads.back (); + hw_breaks = p->hw_breaks; + + /* Copy that thread's breakpoints and watchpoints to the new thread. */ + for (i = 0; i < max_slots_number; i++) + if (hw_breaks[i].hw_break) + { + /* Older kernels did not make new threads inherit their parent + thread's debug state, so we always clear the slot and replicate + the debug state ourselves, ensuring compatibility with all + kernels. */ + + /* The ppc debug resource accounting is done through "slots". + Ask the kernel the deallocate this specific *point's slot. */ + ptrace (PPC_PTRACE_DELHWDEBUG, tid, 0, hw_breaks[i].slot); + + hwdebug_insert_point (hw_breaks[i].hw_break, tid); + } + } + else + ptrace (PTRACE_SET_DEBUGREG, tid, 0, saved_dabr_value); } static void -right_fill_reg (const struct regcache *regcache, int regnum, void *reg) +ppc_linux_thread_exit (struct thread_info *tp, int silent) { - /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace - interface, and not the wordsize of the program's ABI. */ - int wordsize = sizeof (long); - /* Right fill the register. */ - regcache_raw_collect (regcache, regnum, - ((bfd_byte *) reg - + wordsize - - register_size (current_gdbarch, regnum))); + int i; + int tid = tp->ptid.lwp (); + struct hw_break_tuple *hw_breaks; + struct thread_points *t = NULL; + + if (!have_ptrace_hwdebug_interface ()) + return; + + for (i = 0; i < ppc_threads.size (); i++) + { + if (ppc_threads[i]->tid == tid) + { + t = ppc_threads[i]; + break; + } + } + + if (t == NULL) + return; + + unordered_remove (ppc_threads, i); + + hw_breaks = t->hw_breaks; + + for (i = 0; i < max_slots_number; i++) + if (hw_breaks[i].hw_break) + xfree (hw_breaks[i].hw_break); + + xfree (t->hw_breaks); + xfree (t); } -void -fill_gregset (const struct regcache *regcache, - gdb_gregset_t *gregsetp, int regno) +bool +ppc_linux_nat_target::stopped_data_address (CORE_ADDR *addr_p) { - int regi; - elf_greg_t *regp = (elf_greg_t *) gregsetp; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - const int elf_ngreg = 48; + siginfo_t siginfo; + if (!linux_nat_get_siginfo (inferior_ptid, &siginfo)) + return false; - /* Start with zeros. */ - memset (regp, 0, elf_ngreg * sizeof (*regp)); + if (siginfo.si_signo != SIGTRAP + || (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */) + return false; - for (regi = 0; regi < ppc_num_gprs; regi++) + if (have_ptrace_hwdebug_interface ()) { - if ((regno == -1) || regno == tdep->ppc_gp0_regnum + regi) - right_fill_reg (regcache, tdep->ppc_gp0_regnum + regi, - (regp + PT_R0 + regi)); + int i; + struct thread_points *t; + struct hw_break_tuple *hw_breaks; + /* The index (or slot) of the *point is passed in the si_errno field. */ + int slot = siginfo.si_errno; + + t = hwdebug_find_thread_points_by_tid (inferior_ptid.lwp (), 0); + + /* Find out if this *point is a hardware breakpoint. + If so, we should return 0. */ + if (t) + { + hw_breaks = t->hw_breaks; + for (i = 0; i < max_slots_number; i++) + if (hw_breaks[i].hw_break && hw_breaks[i].slot == slot + && hw_breaks[i].hw_break->trigger_type + == PPC_BREAKPOINT_TRIGGER_EXECUTE) + return false; + } } - if ((regno == -1) || regno == PC_REGNUM) - right_fill_reg (regcache, PC_REGNUM, regp + PT_NIP); - if ((regno == -1) || regno == tdep->ppc_lr_regnum) - right_fill_reg (regcache, tdep->ppc_lr_regnum, regp + PT_LNK); - if ((regno == -1) || regno == tdep->ppc_cr_regnum) - regcache_raw_collect (regcache, tdep->ppc_cr_regnum, - regp + PT_CCR); - if ((regno == -1) || regno == tdep->ppc_xer_regnum) - regcache_raw_collect (regcache, tdep->ppc_xer_regnum, - regp + PT_XER); - if ((regno == -1) || regno == tdep->ppc_ctr_regnum) - right_fill_reg (regcache, tdep->ppc_ctr_regnum, regp + PT_CTR); -#ifdef PT_MQ - if (((regno == -1) || regno == tdep->ppc_mq_regnum) - && (tdep->ppc_mq_regnum != -1)) - right_fill_reg (regcache, tdep->ppc_mq_regnum, regp + PT_MQ); -#endif - if ((regno == -1) || regno == tdep->ppc_ps_regnum) - right_fill_reg (regcache, tdep->ppc_ps_regnum, regp + PT_MSR); + *addr_p = (CORE_ADDR) (uintptr_t) siginfo.si_addr; + return true; +} + +bool +ppc_linux_nat_target::stopped_by_watchpoint () +{ + CORE_ADDR addr; + return stopped_data_address (&addr); +} + +bool +ppc_linux_nat_target::watchpoint_addr_within_range (CORE_ADDR addr, + CORE_ADDR start, + int length) +{ + int mask; + + if (have_ptrace_hwdebug_interface () + && linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) + return start <= addr && start + length >= addr; + else if (linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) + mask = 3; + else + mask = 7; + + addr &= ~mask; + + /* Check whether [start, start+length-1] intersects [addr, addr+mask]. */ + return start <= addr + mask && start + length - 1 >= addr; +} + +/* Return the number of registers needed for a masked hardware watchpoint. */ + +int +ppc_linux_nat_target::masked_watch_num_registers (CORE_ADDR addr, CORE_ADDR mask) +{ + if (!have_ptrace_hwdebug_interface () + || (hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_MASK) == 0) + return -1; + else if ((mask & 0xC0000000) != 0xC0000000) + { + warning (_("The given mask covers kernel address space " + "and cannot be used.\n")); + + return -2; + } + else + return 2; +} + +void +ppc_linux_nat_target::store_registers (struct regcache *regcache, int regno) +{ + pid_t tid = get_ptrace_pid (regcache->ptid ()); + + if (regno >= 0) + store_register (regcache, tid, regno); + else + store_ppc_registers (regcache, tid); +} + +/* Functions for transferring registers between a gregset_t or fpregset_t + (see sys/ucontext.h) and gdb's regcache. The word size is that used + by the ptrace interface, not the current program's ABI. Eg. if a + powerpc64-linux gdb is being used to debug a powerpc32-linux app, we + read or write 64-bit gregsets. This is to suit the host libthread_db. */ + +void +supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) +{ + const struct regset *regset = ppc_linux_gregset (sizeof (long)); + + ppc_supply_gregset (regset, regcache, -1, gregsetp, sizeof (*gregsetp)); +} + +void +fill_gregset (const struct regcache *regcache, + gdb_gregset_t *gregsetp, int regno) +{ + const struct regset *regset = ppc_linux_gregset (sizeof (long)); + + if (regno == -1) + memset (gregsetp, 0, sizeof (*gregsetp)); + ppc_collect_gregset (regset, regcache, regno, gregsetp, sizeof (*gregsetp)); } void supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp) { - ppc_linux_supply_fpregset (NULL, regcache, -1, fpregsetp, - sizeof (gdb_fpregset_t)); + const struct regset *regset = ppc_linux_fpregset (); + + ppc_supply_fpregset (regset, regcache, -1, + fpregsetp, sizeof (*fpregsetp)); } -/* Given a pointer to a floating point register set in /proc format - (fpregset_t *), update the register specified by REGNO from gdb's - idea of the current floating point register set. If REGNO is -1, - update them all. */ void fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregsetp, int regno) { - int regi; - struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - bfd_byte *fpp = (void *) fpregsetp; - - if (ppc_floating_point_unit_p (current_gdbarch)) + const struct regset *regset = ppc_linux_fpregset (); + + ppc_collect_fpregset (regset, regcache, regno, + fpregsetp, sizeof (*fpregsetp)); +} + +int +ppc_linux_nat_target::auxv_parse (gdb_byte **readptr, + gdb_byte *endptr, CORE_ADDR *typep, + CORE_ADDR *valp) +{ + int tid = inferior_ptid.lwp (); + if (tid == 0) + tid = inferior_ptid.pid (); + + int sizeof_auxv_field = ppc_linux_target_wordsize (tid); + + enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); + gdb_byte *ptr = *readptr; + + if (endptr == ptr) + return 0; + + if (endptr - ptr < sizeof_auxv_field * 2) + return -1; + + *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); + ptr += sizeof_auxv_field; + *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); + ptr += sizeof_auxv_field; + + *readptr = ptr; + return 1; +} + +const struct target_desc * +ppc_linux_nat_target::read_description () +{ + int tid = inferior_ptid.lwp (); + if (tid == 0) + tid = inferior_ptid.pid (); + + if (have_ptrace_getsetevrregs) { - for (regi = 0; regi < ppc_num_fprs; regi++) - { - if ((regno == -1) || (regno == tdep->ppc_fp0_regnum + regi)) - regcache_raw_collect (regcache, tdep->ppc_fp0_regnum + regi, - fpp + 8 * regi); - } - if (regno == -1 || regno == tdep->ppc_fpscr_regnum) - right_fill_reg (regcache, tdep->ppc_fpscr_regnum, (fpp + 8 * 32)); + struct gdb_evrregset_t evrregset; + + if (ptrace (PTRACE_GETEVRREGS, tid, 0, &evrregset) >= 0) + return tdesc_powerpc_e500l; + + /* EIO means that the PTRACE_GETEVRREGS request isn't supported. + Anything else needs to be reported. */ + else if (errno != EIO) + perror_with_name (_("Unable to fetch SPE registers")); + } + + struct ppc_linux_features features = ppc_linux_no_features; + + features.wordsize = ppc_linux_target_wordsize (tid); + + CORE_ADDR hwcap = linux_get_hwcap (current_top_target ()); + CORE_ADDR hwcap2 = linux_get_hwcap2 (current_top_target ()); + + if (have_ptrace_getsetvsxregs + && (hwcap & PPC_FEATURE_HAS_VSX)) + { + gdb_vsxregset_t vsxregset; + + if (ptrace (PTRACE_GETVSXREGS, tid, 0, &vsxregset) >= 0) + features.vsx = true; + + /* EIO means that the PTRACE_GETVSXREGS request isn't supported. + Anything else needs to be reported. */ + else if (errno != EIO) + perror_with_name (_("Unable to fetch VSX registers")); + } + + if (have_ptrace_getvrregs + && (hwcap & PPC_FEATURE_HAS_ALTIVEC)) + { + gdb_vrregset_t vrregset; + + if (ptrace (PTRACE_GETVRREGS, tid, 0, &vrregset) >= 0) + features.altivec = true; + + /* EIO means that the PTRACE_GETVRREGS request isn't supported. + Anything else needs to be reported. */ + else if (errno != EIO) + perror_with_name (_("Unable to fetch AltiVec registers")); + } + + features.isa205 = ppc_linux_has_isa205 (hwcap); + + if ((hwcap2 & PPC_FEATURE2_DSCR) + && check_regset (tid, NT_PPC_PPR, PPC_LINUX_SIZEOF_PPRREGSET) + && check_regset (tid, NT_PPC_DSCR, PPC_LINUX_SIZEOF_DSCRREGSET)) + { + features.ppr_dscr = true; + if ((hwcap2 & PPC_FEATURE2_ARCH_2_07) + && (hwcap2 & PPC_FEATURE2_TAR) + && (hwcap2 & PPC_FEATURE2_EBB) + && check_regset (tid, NT_PPC_TAR, PPC_LINUX_SIZEOF_TARREGSET) + && check_regset (tid, NT_PPC_EBB, PPC_LINUX_SIZEOF_EBBREGSET) + && check_regset (tid, NT_PPC_PMU, PPC_LINUX_SIZEOF_PMUREGSET)) + { + features.isa207 = true; + if ((hwcap2 & PPC_FEATURE2_HTM) + && check_regset (tid, NT_PPC_TM_SPR, + PPC_LINUX_SIZEOF_TM_SPRREGSET)) + features.htm = true; + } } -} -void _initialize_ppc_linux_nat (void); + return ppc_linux_match_description (features); +} void _initialize_ppc_linux_nat (void) { - struct target_ops *t; - - /* Fill in the generic GNU/Linux methods. */ - t = linux_target (); - - /* Add our register access methods. */ - t->to_fetch_registers = ppc_linux_fetch_inferior_registers; - t->to_store_registers = ppc_linux_store_inferior_registers; + linux_target = &the_ppc_linux_nat_target; - /* Add our watchpoint methods. */ - t->to_can_use_hw_breakpoint = ppc_linux_check_watch_resources; - t->to_region_ok_for_hw_watchpoint = ppc_linux_region_ok_for_hw_watchpoint; - t->to_insert_watchpoint = ppc_linux_insert_watchpoint; - t->to_remove_watchpoint = ppc_linux_remove_watchpoint; - t->to_stopped_by_watchpoint = ppc_linux_stopped_by_watchpoint; - t->to_stopped_data_address = ppc_linux_stopped_data_address; + gdb::observers::thread_exit.attach (ppc_linux_thread_exit); /* Register the target. */ - linux_nat_add_target (t); + add_inf_child_target (linux_target); }