-/* PPC linux native support.
- Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996 Free Software Foundation, Inc.
+/* PPC GNU/Linux native support.
+
+ Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002,
+ 2003 Free Software Foundation, Inc.
This file is part of GDB.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
+#include "gdb_string.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
+#include "regcache.h"
#include <sys/types.h>
#include <sys/param.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
-#include <sys/wait.h>
+#include "gdb_wait.h"
#include <fcntl.h>
#include <sys/procfs.h>
+#include <sys/ptrace.h>
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
+#include "ppc-tdep.h"
+
+#ifndef PT_READ_U
+#define PT_READ_U PTRACE_PEEKUSR
+#endif
+#ifndef PT_WRITE_U
+#define PT_WRITE_U PTRACE_POKEUSR
+#endif
+
+/* Default the type of the ptrace transfer to int. */
+#ifndef PTRACE_XFER_TYPE
+#define PTRACE_XFER_TYPE int
+#endif
+
+/* 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
+
+/* 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
+ the vrsave as an extra 4 bytes at the end. I opted for creating a
+ flat array of chars, so that it is easier to manipulate for gdb.
+
+ 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.
+ 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* */
+/*
+ |.|.|.|.|.....|.|.|.|.||.|.|.|x||.|
+ <-------> <-------><-------><->
+ VR0 VR31 VSCR VRSAVE
+*/
+/* *INDENT-ON* */
+
+#define SIZEOF_VRREGS 33*16+4
+
+typedef char gdb_vrregset_t[SIZEOF_VRREGS];
+
+/* For runtime check of ptrace support for VRREGS. */
+int have_ptrace_getvrregs = 1;
int
-kernel_u_size ()
+kernel_u_size (void)
{
return (sizeof (struct user));
}
-static int regmap[] =
-{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_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ};
+/* *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_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */
+/* *INDENT_ON * */
+
+static int
+ppc_register_u_addr (int regno)
+{
+ int u_addr = -1;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ int wordsize = tdep->wordsize;
+
+ /* General purpose registers occupy 1 slot each in the buffer */
+ if (regno >= tdep->ppc_gp0_regnum && regno <= tdep->ppc_gplast_regnum )
+ u_addr = ((PT_R0 + regno) * wordsize);
+
+ /* Floating point regs: eight bytes each in both 32- and 64-bit
+ ptrace interfaces. Thus, two slots each in 32-bit interface, one
+ slot each in 64-bit interface. */
+ if (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)
+ u_addr = (PT_FPR0 * wordsize) + ((regno - FP0_REGNUM) * 8);
+
+ /* UISA special purpose registers: 1 slot each */
+ if (regno == PC_REGNUM)
+ u_addr = PT_NIP * wordsize;
+ if (regno == tdep->ppc_lr_regnum)
+ u_addr = PT_LNK * wordsize;
+ if (regno == tdep->ppc_cr_regnum)
+ u_addr = PT_CCR * wordsize;
+ if (regno == tdep->ppc_xer_regnum)
+ u_addr = PT_XER * wordsize;
+ if (regno == tdep->ppc_ctr_regnum)
+ u_addr = PT_CTR * wordsize;
+#ifdef PT_MQ
+ if (regno == tdep->ppc_mq_regnum)
+ u_addr = PT_MQ * wordsize;
+#endif
+ if (regno == tdep->ppc_ps_regnum)
+ u_addr = PT_MSR * wordsize;
+ if (regno == tdep->ppc_fpscr_regnum)
+ u_addr = PT_FPSCR * wordsize;
+
+ return u_addr;
+}
+
+static int
+ppc_ptrace_cannot_fetch_store_register (int regno)
+{
+ return (ppc_register_u_addr (regno) == -1);
+}
+
+/* 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 (int tid, int regno)
+{
+ int ret;
+ int offset = 0;
+ gdb_vrregset_t regs;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ int vrregsize = DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+
+ ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_getvrregs = 0;
+ return;
+ }
+ perror_with_name ("Unable to fetch AltiVec register");
+ }
+
+ /* 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 - DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
+
+ supply_register (regno,
+ regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset);
+}
+
+static void
+fetch_register (int tid, int regno)
+{
+ /* This isn't really an address. But ptrace thinks of it as one. */
+ char mess[128]; /* For messages */
+ int i;
+ unsigned int offset; /* Offset of registers within the u area. */
+ char buf[MAX_REGISTER_SIZE];
+ CORE_ADDR regaddr = ppc_register_u_addr (regno);
+
+ if (altivec_register_p (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
+ support for such a ptrace request, then go and fetch the
+ register. */
+ if (have_ptrace_getvrregs)
+ {
+ fetch_altivec_register (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. */
+ }
+
+ if (regaddr == -1)
+ {
+ memset (buf, '\0', DEPRECATED_REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
+ supply_register (regno, buf);
+ return;
+ }
+
+ for (i = 0; i < DEPRECATED_REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
+ {
+ errno = 0;
+ *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid,
+ (PTRACE_ARG3_TYPE) regaddr, 0);
+ regaddr += sizeof (PTRACE_XFER_TYPE);
+ if (errno != 0)
+ {
+ sprintf (mess, "reading register %s (#%d)",
+ REGISTER_NAME (regno), regno);
+ perror_with_name (mess);
+ }
+ }
+ supply_register (regno, buf);
+}
+
+static void
+supply_vrregset (gdb_vrregset_t *vrregsetp)
+{
+ 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 = DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+ int offset = vrregsize - DEPRECATED_REGISTER_RAW_SIZE (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))
+ supply_register (tdep->ppc_vr0_regnum + i,
+ *vrregsetp + i * vrregsize + offset);
+ else
+ supply_register (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize);
+ }
+}
+
+static void
+fetch_altivec_registers (int tid)
+{
+ int ret;
+ gdb_vrregset_t regs;
+
+ ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_getvrregs = 0;
+ return;
+ }
+ perror_with_name ("Unable to fetch AltiVec registers");
+ }
+ supply_vrregset (®s);
+}
+
+static void
+fetch_ppc_registers (int tid)
+{
+ int i;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ for (i = 0; i <= tdep->ppc_fpscr_regnum; i++)
+ fetch_register (tid, i);
+ if (tdep->ppc_mq_regnum != -1)
+ fetch_register (tid, tdep->ppc_mq_regnum);
+ if (have_ptrace_getvrregs)
+ if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
+ fetch_altivec_registers (tid);
+}
+
+/* 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. */
+void
+fetch_inferior_registers (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);
+
+ if (regno == -1)
+ fetch_ppc_registers (tid);
+ else
+ fetch_register (tid, regno);
+}
+
+/* Store one register. */
+static void
+store_altivec_register (int tid, int regno)
+{
+ int ret;
+ int offset = 0;
+ gdb_vrregset_t regs;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ int vrregsize = DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+
+ ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_getvrregs = 0;
+ return;
+ }
+ perror_with_name ("Unable to fetch AltiVec register");
+ }
+
+ /* 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 - DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
+
+ regcache_collect (regno,
+ regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset);
+
+ ret = ptrace (PTRACE_SETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ perror_with_name ("Unable to store AltiVec register");
+}
+
+static void
+store_register (int tid, int regno)
+{
+ /* This isn't really an address. But ptrace thinks of it as one. */
+ CORE_ADDR regaddr = ppc_register_u_addr (regno);
+ char mess[128]; /* For messages */
+ int i;
+ unsigned int offset; /* Offset of registers within the u area. */
+ char buf[MAX_REGISTER_SIZE];
+
+ if (altivec_register_p (regno))
+ {
+ store_altivec_register (tid, regno);
+ return;
+ }
+
+ if (regaddr == -1)
+ return;
+
+ regcache_collect (regno, buf);
+ for (i = 0; i < DEPRECATED_REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
+ {
+ errno = 0;
+ ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
+ *(PTRACE_XFER_TYPE *) & buf[i]);
+ regaddr += sizeof (PTRACE_XFER_TYPE);
+
+ if (errno == EIO
+ && regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
+ {
+ /* Some older kernel versions don't allow fpscr to be written. */
+ continue;
+ }
+
+ if (errno != 0)
+ {
+ sprintf (mess, "writing register %s (#%d)",
+ REGISTER_NAME (regno), regno);
+ perror_with_name (mess);
+ }
+ }
+}
+
+static void
+fill_vrregset (gdb_vrregset_t *vrregsetp)
+{
+ 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 = DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+ int offset = vrregsize - DEPRECATED_REGISTER_RAW_SIZE (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_collect (tdep->ppc_vr0_regnum + i,
+ *vrregsetp + i * vrregsize + offset);
+ else
+ regcache_collect (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize);
+ }
+}
+
+static void
+store_altivec_registers (int tid)
+{
+ int ret;
+ gdb_vrregset_t regs;
+
+ ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s);
+ if (ret < 0)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_getvrregs = 0;
+ return;
+ }
+ perror_with_name ("Couldn't get AltiVec registers");
+ }
+
+ fill_vrregset (®s);
+
+ if (ptrace (PTRACE_SETVRREGS, tid, 0, ®s) < 0)
+ perror_with_name ("Couldn't write AltiVec registers");
+}
+
+static void
+store_ppc_registers (int tid)
+{
+ int i;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ for (i = 0; i <= tdep->ppc_fpscr_regnum; i++)
+ store_register (tid, i);
+ if (tdep->ppc_mq_regnum != -1)
+ store_register (tid, tdep->ppc_mq_regnum);
+ if (have_ptrace_getvrregs)
+ if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
+ store_altivec_registers (tid);
+}
+
+void
+store_inferior_registers (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);
+
+ if (regno >= 0)
+ store_register (tid, regno);
+ else
+ store_ppc_registers (tid);
+}
-int
-ppc_register_u_addr (int ustart, int regnum)
+void
+supply_gregset (gdb_gregset_t *gregsetp)
{
- return (ustart + 4 * regmap[regnum]);
+ ppc_linux_supply_gregset ((char *) gregsetp);
}
void
-supply_gregset (gregset_t * gregsetp)
+fill_gregset (gdb_gregset_t *gregsetp, int regno)
{
int regi;
- register greg_t *regp = (greg_t *) gregsetp;
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
for (regi = 0; regi < 32; regi++)
- supply_register (regi, (char *) (regp + regi));
+ {
+ if ((regno == -1) || regno == regi)
+ regcache_collect (regi, regp + PT_R0 + regi);
+ }
- for (regi = FIRST_UISA_SP_REGNUM; regi <= LAST_UISA_SP_REGNUM; regi++)
- supply_register (regi, (char *) (regp + regmap[regi]));
+ if ((regno == -1) || regno == PC_REGNUM)
+ regcache_collect (PC_REGNUM, regp + PT_NIP);
+ if ((regno == -1) || regno == tdep->ppc_lr_regnum)
+ regcache_collect (tdep->ppc_lr_regnum, regp + PT_LNK);
+ if ((regno == -1) || regno == tdep->ppc_cr_regnum)
+ regcache_collect (tdep->ppc_cr_regnum, regp + PT_CCR);
+ if ((regno == -1) || regno == tdep->ppc_xer_regnum)
+ regcache_collect (tdep->ppc_xer_regnum, regp + PT_XER);
+ if ((regno == -1) || regno == tdep->ppc_ctr_regnum)
+ regcache_collect (tdep->ppc_ctr_regnum, regp + PT_CTR);
+#ifdef PT_MQ
+ if (((regno == -1) || regno == tdep->ppc_mq_regnum)
+ && (tdep->ppc_mq_regnum != -1))
+ regcache_collect (tdep->ppc_mq_regnum, regp + PT_MQ);
+#endif
+ if ((regno == -1) || regno == tdep->ppc_ps_regnum)
+ regcache_collect (tdep->ppc_ps_regnum, regp + PT_MSR);
+}
+
+void
+supply_fpregset (gdb_fpregset_t * fpregsetp)
+{
+ ppc_linux_supply_fpregset ((char *) 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
-supply_fpregset (fpregset_t * fpregsetp)
+fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
{
int regi;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
for (regi = 0; regi < 32; regi++)
{
- supply_register (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
+ if ((regno == -1) || (regno == FP0_REGNUM + regi))
+ regcache_collect (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
}
+ if ((regno == -1) || regno == tdep->ppc_fpscr_regnum)
+ regcache_collect (tdep->ppc_fpscr_regnum, (char *) (*fpregsetp + regi));
}
projects / deliverable / binutils-gdb.git / blobdiff