/* Target-dependent code for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
- 1997, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ 1997, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
#include "regcache.h"
#include "value.h"
#include "osabi.h"
-
+#include "regset.h"
#include "solib-svr4.h"
#include "ppc-tdep.h"
+#include "trad-frame.h"
+#include "frame-unwind.h"
/* The following instructions are used in the signal trampoline code
on GNU/Linux PPC. The kernel used to use magic syscalls 0x6666 and
/* Determine if pc is in a signal trampoline...
Ha! That's not what this does at all. wait_for_inferior in
- infrun.c calls PC_IN_SIGTRAMP in order to detect entry into a
+ infrun.c calls get_frame_type() in order to detect entry into a
signal trampoline just after delivery of a signal. But on
GNU/Linux, signal trampolines are used for the return path only.
The kernel sets things up so that the signal handler is called
signal is delivered while stepping, the next instruction that
would've been stepped over isn't, instead a signal is delivered and
the first instruction of the handler is stepped over instead. That
- puts us on the second instruction. (I added the test for the
- first instruction long after the fact, just in case the observed
- behavior is ever fixed.)
-
- PC_IN_SIGTRAMP is called from blockframe.c as well in order to set
- the frame's type (if a SIGTRAMP_FRAME). Because of our strange
- definition of in_sigtramp below, we can't rely on the frame's type
- getting set correctly from within blockframe.c. This is why we
- take pains to set it in init_extra_frame_info().
-
- NOTE: cagney/2002-11-10: I suspect the real problem here is that
- the get_prev_frame() only initializes the frame's type after the
- call to INIT_FRAME_INFO. get_prev_frame() should be fixed, this
- code shouldn't be working its way around a bug :-(. */
+ puts us on the second instruction. (I added the test for the first
+ instruction long after the fact, just in case the observed behavior
+ is ever fixed.) */
int
ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
return SYMBOL_VALUE_ADDRESS (msymbol);
}
-/* The rs6000 version of FRAME_SAVED_PC will almost work for us. The
- signal handler details are different, so we'll handle those here
- and call the rs6000 version to do the rest. */
-CORE_ADDR
-ppc_linux_frame_saved_pc (struct frame_info *fi)
-{
- if ((get_frame_type (fi) == SIGTRAMP_FRAME))
- {
- CORE_ADDR regs_addr =
- read_memory_integer (get_frame_base (fi)
- + PPC_LINUX_REGS_PTR_OFFSET, 4);
- /* return the NIP in the regs array */
- return read_memory_integer (regs_addr + 4 * PPC_LINUX_PT_NIP, 4);
- }
- else if (get_next_frame (fi)
- && (get_frame_type (get_next_frame (fi)) == SIGTRAMP_FRAME))
- {
- CORE_ADDR regs_addr =
- read_memory_integer (get_frame_base (get_next_frame (fi))
- + PPC_LINUX_REGS_PTR_OFFSET, 4);
- /* return LNK in the regs array */
- return read_memory_integer (regs_addr + 4 * PPC_LINUX_PT_LNK, 4);
- }
- else
- return rs6000_frame_saved_pc (fi);
-}
-
-void
-ppc_linux_init_extra_frame_info (int fromleaf, struct frame_info *fi)
-{
- rs6000_init_extra_frame_info (fromleaf, fi);
-
- if (get_next_frame (fi) != 0)
- {
- /* We're called from get_prev_frame_info; check to see if
- this is a signal frame by looking to see if the pc points
- at trampoline code */
- if (ppc_linux_at_sigtramp_return_path (get_frame_pc (fi)))
- deprecated_set_frame_type (fi, SIGTRAMP_FRAME);
- else
- /* FIXME: cagney/2002-11-10: Is this double bogus? What
- happens if the frame has previously been marked as a dummy? */
- deprecated_set_frame_type (fi, NORMAL_FRAME);
- }
-}
-
-int
-ppc_linux_frameless_function_invocation (struct frame_info *fi)
-{
- /* We'll find the wrong thing if we let
- rs6000_frameless_function_invocation () search for a signal trampoline */
- if (ppc_linux_at_sigtramp_return_path (get_frame_pc (fi)))
- return 0;
- else
- return rs6000_frameless_function_invocation (fi);
-}
-
-void
-ppc_linux_frame_init_saved_regs (struct frame_info *fi)
-{
- if ((get_frame_type (fi) == SIGTRAMP_FRAME))
- {
- CORE_ADDR regs_addr;
- int i;
- if (deprecated_get_frame_saved_regs (fi))
- return;
-
- frame_saved_regs_zalloc (fi);
-
- regs_addr =
- read_memory_integer (get_frame_base (fi)
- + PPC_LINUX_REGS_PTR_OFFSET, 4);
- deprecated_get_frame_saved_regs (fi)[PC_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_NIP;
- deprecated_get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_ps_regnum] =
- regs_addr + 4 * PPC_LINUX_PT_MSR;
- deprecated_get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_cr_regnum] =
- regs_addr + 4 * PPC_LINUX_PT_CCR;
- deprecated_get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_lr_regnum] =
- regs_addr + 4 * PPC_LINUX_PT_LNK;
- deprecated_get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_ctr_regnum] =
- regs_addr + 4 * PPC_LINUX_PT_CTR;
- deprecated_get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_xer_regnum] =
- regs_addr + 4 * PPC_LINUX_PT_XER;
- deprecated_get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_mq_regnum] =
- regs_addr + 4 * PPC_LINUX_PT_MQ;
- for (i = 0; i < 32; i++)
- deprecated_get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_gp0_regnum + i] =
- regs_addr + 4 * PPC_LINUX_PT_R0 + 4 * i;
- for (i = 0; i < 32; i++)
- deprecated_get_frame_saved_regs (fi)[FP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_FPR0 + 8 * i;
- }
- else
- rs6000_frame_init_saved_regs (fi);
-}
-
-CORE_ADDR
-ppc_linux_frame_chain (struct frame_info *thisframe)
-{
- /* Kernel properly constructs the frame chain for the handler */
- if ((get_frame_type (thisframe) == SIGTRAMP_FRAME))
- return read_memory_integer (get_frame_base (thisframe), 4);
- else
- return rs6000_frame_chain (thisframe);
-}
-
/* ppc_linux_memory_remove_breakpoints attempts to remove a breakpoint
in much the same fashion as memory_remove_breakpoint in mem-break.c,
but is careful not to write back the previous contents if the code
#define PPC64_STANDARD_LINKAGE_LEN \
(sizeof (ppc64_standard_linkage) / sizeof (ppc64_standard_linkage[0]))
-
-/* Recognize a 64-bit PowerPC GNU/Linux linkage function --- what GDB
- calls a "solib trampoline". */
-static int
-ppc64_in_solib_call_trampoline (CORE_ADDR pc, char *name)
-{
- /* Detecting solib call trampolines on PPC64 GNU/Linux is a pain.
-
- It's not specifically solib call trampolines that are the issue.
- Any call from one function to another function that uses a
- different TOC requires a trampoline, to save the caller's TOC
- pointer and then load the callee's TOC. An executable or shared
- library may have more than one TOC, so even intra-object calls
- may require a trampoline. Since executable and shared libraries
- will all have their own distinct TOCs, every inter-object call is
- also an inter-TOC call, and requires a trampoline --- so "solib
- call trampolines" are just a special case.
-
- The 64-bit PowerPC GNU/Linux ABI calls these call trampolines
- "linkage functions". Since they need to be near the functions
- that call them, they all appear in .text, not in any special
- section. The .plt section just contains an array of function
- descriptors, from which the linkage functions load the callee's
- entry point, TOC value, and environment pointer. So
- in_plt_section is useless. The linkage functions don't have any
- special linker symbols to name them, either.
-
- The only way I can see to recognize them is to actually look at
- their code. They're generated by ppc_build_one_stub and some
- other functions in bfd/elf64-ppc.c, so that should show us all
- the instruction sequences we need to recognize. */
- unsigned int insn[PPC64_STANDARD_LINKAGE_LEN];
-
- return insns_match_pattern (pc, ppc64_standard_linkage, insn);
-}
-
-
/* When the dynamic linker is doing lazy symbol resolution, the first
call to a function in another object will go like this:
return addr;
}
+static void
+right_supply_register (struct regcache *regcache, int wordsize, int regnum,
+ const bfd_byte *buf)
+{
+ regcache_raw_supply (regcache, regnum,
+ (buf + wordsize - register_size (current_gdbarch, regnum)));
+}
-enum {
- ELF_NGREG = 48,
- ELF_NFPREG = 33,
- ELF_NVRREG = 33
-};
-
-enum {
- ELF_GREGSET_SIZE = (ELF_NGREG * 4),
- ELF_FPREGSET_SIZE = (ELF_NFPREG * 8)
-};
+/* Extract the register values found in the WORDSIZED ABI GREGSET,
+ storing their values in REGCACHE. Note that some are left-aligned,
+ while others are right aligned. */
void
-ppc_linux_supply_gregset (char *buf)
+ppc_linux_supply_gregset (struct regcache *regcache,
+ int regnum, const void *gregs, size_t size,
+ int wordsize)
{
int regi;
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
- for (regi = 0; regi < 32; regi++)
- supply_register (regi, buf + 4 * regi);
-
- supply_register (PC_REGNUM, buf + 4 * PPC_LINUX_PT_NIP);
- supply_register (tdep->ppc_lr_regnum, buf + 4 * PPC_LINUX_PT_LNK);
- supply_register (tdep->ppc_cr_regnum, buf + 4 * PPC_LINUX_PT_CCR);
- supply_register (tdep->ppc_xer_regnum, buf + 4 * PPC_LINUX_PT_XER);
- supply_register (tdep->ppc_ctr_regnum, buf + 4 * PPC_LINUX_PT_CTR);
- if (tdep->ppc_mq_regnum != -1)
- supply_register (tdep->ppc_mq_regnum, buf + 4 * PPC_LINUX_PT_MQ);
- supply_register (tdep->ppc_ps_regnum, buf + 4 * PPC_LINUX_PT_MSR);
+ struct gdbarch *regcache_arch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *regcache_tdep = gdbarch_tdep (regcache_arch);
+ const bfd_byte *buf = gregs;
+
+ for (regi = 0; regi < ppc_num_gprs; regi++)
+ right_supply_register (regcache, wordsize,
+ regcache_tdep->ppc_gp0_regnum + regi,
+ buf + wordsize * regi);
+
+ right_supply_register (regcache, wordsize, gdbarch_pc_regnum (regcache_arch),
+ buf + wordsize * PPC_LINUX_PT_NIP);
+ right_supply_register (regcache, wordsize, regcache_tdep->ppc_lr_regnum,
+ buf + wordsize * PPC_LINUX_PT_LNK);
+ regcache_raw_supply (regcache, regcache_tdep->ppc_cr_regnum,
+ buf + wordsize * PPC_LINUX_PT_CCR);
+ regcache_raw_supply (regcache, regcache_tdep->ppc_xer_regnum,
+ buf + wordsize * PPC_LINUX_PT_XER);
+ regcache_raw_supply (regcache, regcache_tdep->ppc_ctr_regnum,
+ buf + wordsize * PPC_LINUX_PT_CTR);
+ if (regcache_tdep->ppc_mq_regnum != -1)
+ right_supply_register (regcache, wordsize, regcache_tdep->ppc_mq_regnum,
+ buf + wordsize * PPC_LINUX_PT_MQ);
+ right_supply_register (regcache, wordsize, regcache_tdep->ppc_ps_regnum,
+ buf + wordsize * PPC_LINUX_PT_MSR);
}
-void
-ppc_linux_supply_fpregset (char *buf)
+static void
+ppc32_linux_supply_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs, size_t size)
{
- int regi;
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
- for (regi = 0; regi < 32; regi++)
- supply_register (FP0_REGNUM + regi, buf + 8 * regi);
-
- /* The FPSCR is stored in the low order word of the last doubleword in the
- fpregset. */
- supply_register (tdep->ppc_fpscr_regnum, buf + 8 * 32 + 4);
+ ppc_linux_supply_gregset (regcache, regnum, gregs, size, 4);
}
-/*
- Use a local version of this function to get the correct types for regsets.
-*/
+static struct regset ppc32_linux_gregset = {
+ NULL, ppc32_linux_supply_gregset
+};
-static void
-fetch_core_registers (char *core_reg_sect,
- unsigned core_reg_size,
- int which,
- CORE_ADDR reg_addr)
+struct ppc_linux_sigtramp_cache
+{
+ CORE_ADDR base;
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+static struct ppc_linux_sigtramp_cache *
+ppc_linux_sigtramp_cache (struct frame_info *next_frame, void **this_cache)
{
- if (which == 0)
+ CORE_ADDR regs;
+ CORE_ADDR gpregs;
+ CORE_ADDR fpregs;
+ int i;
+ struct ppc_linux_sigtramp_cache *cache;
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if ((*this_cache) != NULL)
+ return (*this_cache);
+ cache = FRAME_OBSTACK_ZALLOC (struct ppc_linux_sigtramp_cache);
+ (*this_cache) = cache;
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+ cache->base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
+
+ /* Find the register pointer, which gives the address of the
+ register buffers. */
+ if (tdep->wordsize == 4)
+ regs = (cache->base
+ + 0xd0 /* Offset to ucontext_t. */
+ + 0x30 /* Offset to .reg. */);
+ else
+ regs = (cache->base
+ + 0x80 /* Offset to ucontext_t. */
+ + 0xe0 /* Offset to .reg. */);
+ /* And the corresponding register buffers. */
+ gpregs = read_memory_unsigned_integer (regs, tdep->wordsize);
+ fpregs = gpregs + 48 * tdep->wordsize;
+
+ /* General purpose. */
+ for (i = 0; i < ppc_num_gprs; i++)
{
- if (core_reg_size == ELF_GREGSET_SIZE)
- ppc_linux_supply_gregset (core_reg_sect);
- else
- warning ("wrong size gregset struct in core file");
+ int regnum = i + tdep->ppc_gp0_regnum;
+ cache->saved_regs[regnum].addr = gpregs + i * tdep->wordsize;
}
- else if (which == 2)
+ cache->saved_regs[PC_REGNUM].addr = gpregs + 32 * tdep->wordsize;
+ cache->saved_regs[tdep->ppc_ctr_regnum].addr = gpregs + 35 * tdep->wordsize;
+ cache->saved_regs[tdep->ppc_lr_regnum].addr = gpregs + 36 * tdep->wordsize;
+ cache->saved_regs[tdep->ppc_xer_regnum].addr = gpregs + 37 * tdep->wordsize;
+ cache->saved_regs[tdep->ppc_cr_regnum].addr = gpregs + 38 * tdep->wordsize;
+
+ /* Floating point registers. */
+ if (ppc_floating_point_unit_p (gdbarch))
{
- if (core_reg_size == ELF_FPREGSET_SIZE)
- ppc_linux_supply_fpregset (core_reg_sect);
- else
- warning ("wrong size fpregset struct in core file");
+ for (i = 0; i < ppc_num_fprs; i++)
+ {
+ int regnum = i + tdep->ppc_fp0_regnum;
+ cache->saved_regs[regnum].addr = fpregs + i * tdep->wordsize;
+ }
+ cache->saved_regs[tdep->ppc_fpscr_regnum].addr
+ = fpregs + 32 * tdep->wordsize;
}
+
+ return cache;
}
-/* Register that we are able to handle ELF file formats using standard
- procfs "regset" structures. */
+static void
+ppc_linux_sigtramp_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct ppc_linux_sigtramp_cache *info
+ = ppc_linux_sigtramp_cache (next_frame, this_cache);
+ (*this_id) = frame_id_build (info->base, frame_pc_unwind (next_frame));
+}
-static struct core_fns ppc_linux_regset_core_fns =
+static void
+ppc_linux_sigtramp_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ struct ppc_linux_sigtramp_cache *info
+ = ppc_linux_sigtramp_cache (next_frame, this_cache);
+ trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind ppc_linux_sigtramp_unwind =
{
- bfd_target_elf_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_core_registers, /* core_read_registers */
- NULL /* next */
+ SIGTRAMP_FRAME,
+ ppc_linux_sigtramp_this_id,
+ ppc_linux_sigtramp_prev_register
};
+static const struct frame_unwind *
+ppc_linux_sigtramp_sniffer (struct frame_info *next_frame)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (next_frame));
+ if (frame_pc_unwind (next_frame)
+ > frame_unwind_register_unsigned (next_frame, SP_REGNUM))
+ /* Assume anything that is vaguely on the stack is a signal
+ trampoline. */
+ return &ppc_linux_sigtramp_unwind;
+ else
+ return NULL;
+}
+
+static void
+ppc64_linux_supply_gregset (const struct regset *regset,
+ struct regcache * regcache,
+ int regnum, const void *gregs, size_t size)
+{
+ ppc_linux_supply_gregset (regcache, regnum, gregs, size, 8);
+}
+
+static struct regset ppc64_linux_gregset = {
+ NULL, ppc64_linux_supply_gregset
+};
+
+void
+ppc_linux_supply_fpregset (const struct regset *regset,
+ struct regcache * regcache,
+ int regnum, const void *fpset, size_t size)
+{
+ int regi;
+ struct gdbarch *regcache_arch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *regcache_tdep = gdbarch_tdep (regcache_arch);
+ const bfd_byte *buf = fpset;
+
+ if (! ppc_floating_point_unit_p (regcache_arch))
+ return;
+
+ for (regi = 0; regi < ppc_num_fprs; regi++)
+ regcache_raw_supply (regcache,
+ regcache_tdep->ppc_fp0_regnum + regi,
+ buf + 8 * regi);
+
+ /* The FPSCR is stored in the low order word of the last
+ doubleword in the fpregset. */
+ regcache_raw_supply (regcache, regcache_tdep->ppc_fpscr_regnum,
+ buf + 8 * 32 + 4);
+}
+
+static struct regset ppc_linux_fpregset = { NULL, ppc_linux_supply_fpregset };
+
+static const struct regset *
+ppc_linux_regset_from_core_section (struct gdbarch *core_arch,
+ const char *sect_name, size_t sect_size)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (core_arch);
+ if (strcmp (sect_name, ".reg") == 0)
+ {
+ if (tdep->wordsize == 4)
+ return &ppc32_linux_gregset;
+ else
+ return &ppc64_linux_gregset;
+ }
+ if (strcmp (sect_name, ".reg2") == 0)
+ return &ppc_linux_fpregset;
+ return NULL;
+}
+
static void
ppc_linux_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
if (tdep->wordsize == 4)
{
+ /* NOTE: jimb/2004-03-26: The System V ABI PowerPC Processor
+ Supplement says that long doubles are sixteen bytes long.
+ However, as one of the known warts of its ABI, PPC GNU/Linux
+ uses eight-byte long doubles. GCC only recently got 128-bit
+ long double support on PPC, so it may be changing soon. The
+ Linux[sic] Standards Base says that programs that use 'long
+ double' on PPC GNU/Linux are non-conformant. */
+ set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT);
+
/* Until November 2001, gcc did not comply with the 32 bit SysV
R4 ABI requirement that structures less than or equal to 8
bytes should be returned in registers. Instead GCC was using
PowerOpen struct convention. */
set_gdbarch_return_value (gdbarch, ppc_linux_return_value);
- /* Note: kevinb/2002-04-12: See note in rs6000_gdbarch_init regarding
- *_push_arguments(). The same remarks hold for the methods below. */
- set_gdbarch_deprecated_frameless_function_invocation (gdbarch, ppc_linux_frameless_function_invocation);
- set_gdbarch_deprecated_frame_chain (gdbarch, ppc_linux_frame_chain);
- set_gdbarch_deprecated_frame_saved_pc (gdbarch, ppc_linux_frame_saved_pc);
-
- set_gdbarch_deprecated_frame_init_saved_regs (gdbarch,
- ppc_linux_frame_init_saved_regs);
- set_gdbarch_deprecated_init_extra_frame_info (gdbarch,
- ppc_linux_init_extra_frame_info);
-
set_gdbarch_memory_remove_breakpoint (gdbarch,
ppc_linux_memory_remove_breakpoint);
+
/* Shared library handling. */
- set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
set_gdbarch_skip_trampoline_code (gdbarch,
ppc_linux_skip_trampoline_code);
set_solib_svr4_fetch_link_map_offsets
function descriptors). */
set_gdbarch_convert_from_func_ptr_addr
(gdbarch, ppc64_linux_convert_from_func_ptr_addr);
-
- set_gdbarch_in_solib_call_trampoline
- (gdbarch, ppc64_in_solib_call_trampoline);
set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);
/* PPC64 malloc's entry-point is called ".malloc". */
set_gdbarch_name_of_malloc (gdbarch, ".malloc");
}
+ set_gdbarch_regset_from_core_section (gdbarch, ppc_linux_regset_from_core_section);
+ frame_unwind_append_sniffer (gdbarch, ppc_linux_sigtramp_sniffer);
}
void
ppc_linux_init_abi);
gdbarch_register_osabi (bfd_arch_rs6000, bfd_mach_rs6k, GDB_OSABI_LINUX,
ppc_linux_init_abi);
- add_core_fns (&ppc_linux_regset_core_fns);
}
projects / deliverable / binutils-gdb.git / blobdiff