-/* Native-dependent code for Linux running on i386's, for GDB.
- Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+/* Native-dependent code for GNU/Linux x86.
+
+ Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
+#include "regcache.h"
-/* For i386_linux_skip_solib_resolver. */
-#include "symtab.h"
-#include "symfile.h"
-#include "objfiles.h"
-
+#include "gdb_assert.h"
+#include "gdb_string.h"
#include <sys/ptrace.h>
#include <sys/user.h>
#include <sys/procfs.h>
#include <sys/reg.h>
#endif
-/* Prototypes for supply_gregset etc. */
-#include "gregset.h"
+#ifndef ORIG_EAX
+#define ORIG_EAX -1
+#endif
-/* On Linux, threads are implemented as pseudo-processes, in which
- case we may be tracing more than one process at a time. In that
- case, inferior_pid will contain the main process ID and the
- individual thread (process) ID mashed together. These macros are
- used to separate them out. These definitions should be overridden
- if thread support is included. */
+#ifdef HAVE_SYS_DEBUGREG_H
+#include <sys/debugreg.h>
+#endif
+
+#ifndef DR_FIRSTADDR
+#define DR_FIRSTADDR 0
+#endif
-#if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */
-#define PIDGET(PID) PID
-#define TIDGET(PID) 0
+#ifndef DR_LASTADDR
+#define DR_LASTADDR 3
#endif
+#ifndef DR_STATUS
+#define DR_STATUS 6
+#endif
+
+#ifndef DR_CONTROL
+#define DR_CONTROL 7
+#endif
+
+/* Prototypes for supply_gregset etc. */
+#include "gregset.h"
+
+/* Prototypes for i387_supply_fsave etc. */
+#include "i387-tdep.h"
+
+/* Defines for XMM0_REGNUM etc. */
+#include "i386-tdep.h"
+
+/* Defines I386_LINUX_ORIG_EAX_REGNUM. */
+#include "i386-linux-tdep.h"
-/* The register sets used in Linux ELF core-dumps are identical to the
- register sets in `struct user' that is used for a.out core-dumps,
- and is also used by `ptrace'. The corresponding types are
- `elf_gregset_t' for the general-purpose registers (with
+/* Prototypes for local functions. */
+static void dummy_sse_values (void);
+
+\f
+
+/* The register sets used in GNU/Linux ELF core-dumps are identical to
+ the register sets in `struct user' that is used for a.out
+ core-dumps, and is also used by `ptrace'. The corresponding types
+ are `elf_gregset_t' for the general-purpose registers (with
`elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
for the floating-point registers.
EAX, ECX, EDX, EBX,
UESP, EBP, ESI, EDI,
EIP, EFL, CS, SS,
- DS, ES, FS, GS
+ DS, ES, FS, GS,
+ -1, -1, -1, -1, /* st0, st1, st2, st3 */
+ -1, -1, -1, -1, /* st4, st5, st6, st7 */
+ -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */
+ -1, -1, -1, -1, /* fioff, foseg, fooff, fop */
+ -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */
+ -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */
+ -1, /* mxcsr */
+ ORIG_EAX
};
/* Which ptrace request retrieves which registers?
These apply to the corresponding SET requests as well. */
#define GETREGS_SUPPLIES(regno) \
- (0 <= (regno) && (regno) <= 15)
+ ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM)
#define GETFPREGS_SUPPLIES(regno) \
(FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM)
-#define GETXFPREGS_SUPPLIES(regno) \
+#define GETFPXREGS_SUPPLIES(regno) \
(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
/* Does the current host support the GETREGS request? */
#endif
;
-/* Does the current host support the GETXFPREGS request? The header
+/* Does the current host support the GETFPXREGS request? The header
file may or may not define it, and even if it is defined, the
kernel will return EIO if it's running on a pre-SSE processor.
- PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own
- Linux kernel patch for SSE support. That patch may or may not
- actually make it into the official distribution. If you find that
- years have gone by since this stuff was added, and Linux isn't
- using PTRACE_GETXFPREGS, that means that our patch didn't make it,
- and you can delete this, and the related code.
-
My instinct is to attach this to some architecture- or
target-specific data structure, but really, a particular GDB
process can only run on top of one kernel at a time. So it's okay
for this to be a simple variable. */
-int have_ptrace_getxfpregs =
-#ifdef HAVE_PTRACE_GETXFPREGS
+int have_ptrace_getfpxregs =
+#ifdef HAVE_PTRACE_GETFPXREGS
1
#else
0
#endif
;
-
\f
-/* Fetching registers directly from the U area, one at a time. */
-
-/* FIXME: kettenis/2000-03-05: This duplicates code from `inptrace.c'.
- The problem is that we define FETCH_INFERIOR_REGISTERS since we
- want to use our own versions of {fetch,store}_inferior_registers
- that use the GETREGS request. This means that the code in
- `infptrace.c' is #ifdef'd out. But we need to fall back on that
- code when GDB is running on top of a kernel that doesn't support
- the GETREGS request. I want to avoid changing `infptrace.c' right
- now. */
-
-#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
-
-/* Registers we shouldn't try to fetch. */
-#if !defined (CANNOT_FETCH_REGISTER)
-#define CANNOT_FETCH_REGISTER(regno) 0
-#endif
+/* Support for the user struct. */
-/* Fetch one register. */
+/* Return the address of register REGNUM. BLOCKEND is the value of
+ u.u_ar0, which should point to the registers. */
-static void
-fetch_register (int regno)
+CORE_ADDR
+register_u_addr (CORE_ADDR blockend, int regnum)
{
- /* This isn't really an address. But ptrace thinks of it as one. */
- CORE_ADDR regaddr;
- char mess[128]; /* For messages */
- register int i;
- unsigned int offset; /* Offset of registers within the u area. */
- char buf[MAX_REGISTER_RAW_SIZE];
- int tid;
-
- if (CANNOT_FETCH_REGISTER (regno))
- {
- memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
- supply_register (regno, buf);
- return;
- }
-
- /* Overload thread id onto process id */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* no thread id, just use process id */
-
- offset = U_REGS_OFFSET;
-
- regaddr = register_addr (regno, offset);
- for (i = 0; i < 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);
+ return (blockend + 4 * regmap[regnum]);
}
-/* Fetch register values from the inferior.
- If REGNO is negative, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
+/* Return the size of the user struct. */
-void
-old_fetch_inferior_registers (int regno)
+int
+kernel_u_size (void)
{
- if (regno >= 0)
- {
- fetch_register (regno);
- }
- else
- {
- for (regno = 0; regno < ARCH_NUM_REGS; regno++)
- {
- fetch_register (regno);
- }
- }
+ return (sizeof (struct user));
}
+\f
-/* Registers we shouldn't try to store. */
-#if !defined (CANNOT_STORE_REGISTER)
-#define CANNOT_STORE_REGISTER(regno) 0
-#endif
+/* Accessing registers through the U area, one at a time. */
-/* Store one register. */
+/* Fetch one register. */
static void
-store_register (int regno)
+fetch_register (int regno)
{
- /* This isn't really an address. But ptrace thinks of it as one. */
- CORE_ADDR regaddr;
- char mess[128]; /* For messages */
- register int i;
- unsigned int offset; /* Offset of registers within the u area. */
int tid;
+ int val;
- if (CANNOT_STORE_REGISTER (regno))
+ gdb_assert (!have_ptrace_getregs);
+ if (cannot_fetch_register (regno))
{
+ supply_register (regno, NULL);
return;
}
- /* Overload thread id onto process id */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* no thread id, just use process id */
+ /* GNU/Linux LWP ID's are process ID's. */
+ if ((tid = TIDGET (inferior_ptid)) == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
- offset = U_REGS_OFFSET;
+ errno = 0;
+ val = ptrace (PTRACE_PEEKUSER, tid, register_addr (regno, 0), 0);
+ if (errno != 0)
+ error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno),
+ regno, safe_strerror (errno));
- regaddr = register_addr (regno, offset);
- for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
- *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]);
- regaddr += sizeof (PTRACE_XFER_TYPE);
- if (errno != 0)
- {
- sprintf (mess, "writing register %s (#%d)",
- REGISTER_NAME (regno), regno);
- perror_with_name (mess);
- }
- }
+ supply_register (regno, &val);
}
-/* Store our register values back into the inferior.
- If REGNO is negative, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
+/* Store one register. */
-void
-old_store_inferior_registers (int regno)
+static void
+store_register (int regno)
{
- if (regno >= 0)
- {
- store_register (regno);
- }
- else
- {
- for (regno = 0; regno < ARCH_NUM_REGS; regno++)
- {
- store_register (regno);
- }
- }
+ int tid;
+ int val;
+
+ gdb_assert (!have_ptrace_getregs);
+ if (cannot_store_register (regno))
+ return;
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ if ((tid = TIDGET (inferior_ptid)) == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+
+ errno = 0;
+ regcache_collect (regno, &val);
+ ptrace (PTRACE_POKEUSER, tid, register_addr (regno, 0), val);
+ if (errno != 0)
+ error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno),
+ regno, safe_strerror (errno));
}
-
\f
+
/* Transfering the general-purpose registers between GDB, inferiors
and core files. */
-/* Fill GDB's register array with the genereal-purpose register values
+/* Fill GDB's register array with the general-purpose register values
in *GREGSETP. */
void
supply_gregset (elf_gregset_t *gregsetp)
{
elf_greg_t *regp = (elf_greg_t *) gregsetp;
- int regi;
-
- for (regi = 0; regi < NUM_GREGS; regi++)
- supply_register (regi, (char *) (regp + regmap[regi]));
-}
+ int i;
-/* Convert the valid general-purpose register values in GDB's register
- array to `struct user' format and store them in *GREGSETP. The
- array VALID indicates which register values are valid. If VALID is
- NULL, all registers are assumed to be valid. */
+ for (i = 0; i < I386_NUM_GREGS; i++)
+ supply_register (i, (char *) (regp + regmap[i]));
-static void
-convert_to_gregset (elf_gregset_t *gregsetp, signed char *valid)
-{
- elf_greg_t *regp = (elf_greg_t *) gregsetp;
- int regi;
-
- for (regi = 0; regi < NUM_GREGS; regi++)
- if (! valid || valid[regi])
- *(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)];
+ if (I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS)
+ supply_register (I386_LINUX_ORIG_EAX_REGNUM, (char *) (regp + ORIG_EAX));
}
/* Fill register REGNO (if it is a general-purpose register) in
*GREGSETPS with the value in GDB's register array. If REGNO is -1,
do this for all registers. */
+
void
fill_gregset (elf_gregset_t *gregsetp, int regno)
{
- if (regno == -1)
- {
- convert_to_gregset (gregsetp, NULL);
- return;
- }
-
- if (GETREGS_SUPPLIES (regno))
- {
- signed char valid[NUM_GREGS];
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ int i;
- memset (valid, 0, sizeof (valid));
- valid[regno] = 1;
+ for (i = 0; i < I386_NUM_GREGS; i++)
+ if (regno == -1 || regno == i)
+ regcache_collect (i, regp + regmap[i]);
- convert_to_gregset (gregsetp, valid);
- }
+ if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM)
+ && I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS)
+ regcache_collect (I386_LINUX_ORIG_EAX_REGNUM, regp + ORIG_EAX);
}
#ifdef HAVE_PTRACE_GETREGS
fetch_regs (int tid)
{
elf_gregset_t regs;
- int ret;
- ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s);
- if (ret < 0)
+ if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
{
if (errno == EIO)
{
return;
}
- warning ("Couldn't get registers.");
- return;
+ perror_with_name ("Couldn't get registers");
}
supply_gregset (®s);
into the process/thread specified by TID. */
static void
-store_regs (int tid)
+store_regs (int tid, int regno)
{
elf_gregset_t regs;
- int ret;
- ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s);
- if (ret < 0)
- {
- warning ("Couldn't get registers.");
- return;
- }
+ if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name ("Couldn't get registers");
- convert_to_gregset (®s, register_valid);
-
- ret = ptrace (PTRACE_SETREGS, tid, 0, (int) ®s);
- if (ret < 0)
- {
- warning ("Couldn't write registers.");
- return;
- }
+ fill_gregset (®s, regno);
+
+ if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name ("Couldn't write registers");
}
#else
static void fetch_regs (int tid) {}
-static void store_regs (int tid) {}
+static void store_regs (int tid, int regno) {}
#endif
-
\f
-/* Transfering floating-point registers between GDB, inferiors and cores. */
-/* What is the address of st(N) within the floating-point register set F? */
-#define FPREG_ADDR(f, n) ((char *) &(f)->st_space + (n) * 10)
+/* Transfering floating-point registers between GDB, inferiors and cores. */
/* Fill GDB's register array with the floating-point register values in
*FPREGSETP. */
void
supply_fpregset (elf_fpregset_t *fpregsetp)
{
- int reg;
- long l;
-
- /* Supply the floating-point registers. */
- for (reg = 0; reg < 8; reg++)
- supply_register (FP0_REGNUM + reg, FPREG_ADDR (fpregsetp, reg));
-
- /* We have to mask off the reserved bits in *FPREGSETP before
- storing the values in GDB's register file. */
-#define supply(REGNO, MEMBER) \
- l = fpregsetp->MEMBER & 0xffff; \
- supply_register (REGNO, (char *) &l)
-
- supply (FCTRL_REGNUM, cwd);
- supply (FSTAT_REGNUM, swd);
- supply (FTAG_REGNUM, twd);
- supply_register (FCOFF_REGNUM, (char *) &fpregsetp->fip);
- supply (FDS_REGNUM, fos);
- supply_register (FDOFF_REGNUM, (char *) &fpregsetp->foo);
-
-#undef supply
-
- /* Extract the code segment and opcode from the "fcs" member. */
- l = fpregsetp->fcs & 0xffff;
- supply_register (FCS_REGNUM, (char *) &l);
-
- l = (fpregsetp->fcs >> 16) & ((1 << 11) - 1);
- supply_register (FOP_REGNUM, (char *) &l);
-}
-
-/* Convert the valid floating-point register values in GDB's register
- array to `struct user' format and store them in *FPREGSETP. The
- array VALID indicates which register values are valid. If VALID is
- NULL, all registers are assumed to be valid. */
-
-static void
-convert_to_fpregset (elf_fpregset_t *fpregsetp, signed char *valid)
-{
- int reg;
-
- /* Fill in the floating-point registers. */
- for (reg = 0; reg < 8; reg++)
- if (!valid || valid[reg])
- memcpy (FPREG_ADDR (fpregsetp, reg),
- ®isters[REGISTER_BYTE (FP0_REGNUM + reg)],
- REGISTER_RAW_SIZE(FP0_REGNUM + reg));
-
- /* We're not supposed to touch the reserved bits in *FPREGSETP. */
-
-#define fill(MEMBER, REGNO) \
- if (! valid || valid[(REGNO)]) \
- fpregsetp->MEMBER \
- = ((fpregsetp->MEMBER & ~0xffff) \
- | (* (int *) ®isters[REGISTER_BYTE (REGNO)] & 0xffff))
-
-#define fill_register(MEMBER, REGNO) \
- if (! valid || valid[(REGNO)]) \
- memcpy (&fpregsetp->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \
- sizeof (fpregsetp->MEMBER))
-
- fill (cwd, FCTRL_REGNUM);
- fill (swd, FSTAT_REGNUM);
- fill (twd, FTAG_REGNUM);
- fill_register (fip, FCOFF_REGNUM);
- fill (foo, FDOFF_REGNUM);
- fill_register (fos, FDS_REGNUM);
-
-#undef fill
-#undef fill_register
-
- if (! valid || valid[FCS_REGNUM])
- fpregsetp->fcs
- = ((fpregsetp->fcs & ~0xffff)
- | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff));
-
- if (! valid || valid[FOP_REGNUM])
- fpregsetp->fcs
- = ((fpregsetp->fcs & 0xffff)
- | ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))
- << 16));
+ i387_supply_fsave ((char *) fpregsetp);
+ dummy_sse_values ();
}
/* Fill register REGNO (if it is a floating-point register) in
void
fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
{
- if (regno == -1)
- {
- convert_to_fpregset (fpregsetp, NULL);
- return;
- }
-
- if (GETFPREGS_SUPPLIES(regno))
- {
- signed char valid[MAX_NUM_REGS];
-
- memset (valid, 0, sizeof (valid));
- valid[regno] = 1;
-
- convert_to_fpregset (fpregsetp, valid);
- }
+ i387_fill_fsave ((char *) fpregsetp, regno);
}
#ifdef HAVE_PTRACE_GETREGS
fetch_fpregs (int tid)
{
elf_fpregset_t fpregs;
- int ret;
- ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs);
- if (ret < 0)
- {
- warning ("Couldn't get floating point status.");
- return;
- }
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name ("Couldn't get floating point status");
supply_fpregset (&fpregs);
}
into the process/thread specified by TID. */
static void
-store_fpregs (int tid)
+store_fpregs (int tid, int regno)
{
elf_fpregset_t fpregs;
- int ret;
- ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs);
- if (ret < 0)
- {
- warning ("Couldn't get floating point status.");
- return;
- }
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name ("Couldn't get floating point status");
- convert_to_fpregset (&fpregs, register_valid);
+ fill_fpregset (&fpregs, regno);
- ret = ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs);
- if (ret < 0)
- {
- warning ("Couldn't write floating point status.");
- return;
- }
+ if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name ("Couldn't write floating point status");
}
#else
static void fetch_fpregs (int tid) {}
-static void store_fpregs (int tid) {}
+static void store_fpregs (int tid, int regno) {}
#endif
-
\f
-/* Transfering floating-point and SSE registers to and from GDB. */
-/* PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own
- Linux kernel patch for SSE support. That patch may or may not
- actually make it into the official distribution. If you find that
- years have gone by since this code was added, and Linux isn't using
- PTRACE_GETXFPREGS, that means that our patch didn't make it, and
- you can delete this code. */
+/* Transfering floating-point and SSE registers to and from GDB. */
-#ifdef HAVE_PTRACE_GETXFPREGS
+#ifdef HAVE_PTRACE_GETFPXREGS
/* Fill GDB's register array with the floating-point and SSE register
- values in *XFPREGS. */
+ values in *FPXREGSETP. */
-static void
-supply_xfpregset (struct user_xfpregs_struct *xfpregs)
+void
+supply_fpxregset (elf_fpxregset_t *fpxregsetp)
{
- int reg;
-
- /* Supply the floating-point registers. */
- for (reg = 0; reg < 8; reg++)
- supply_register (FP0_REGNUM + reg, (char *) &xfpregs->st_space[reg]);
-
- {
- supply_register (FCTRL_REGNUM, (char *) &xfpregs->cwd);
- supply_register (FSTAT_REGNUM, (char *) &xfpregs->swd);
- supply_register (FTAG_REGNUM, (char *) &xfpregs->twd);
- supply_register (FCOFF_REGNUM, (char *) &xfpregs->fip);
- supply_register (FDS_REGNUM, (char *) &xfpregs->fos);
- supply_register (FDOFF_REGNUM, (char *) &xfpregs->foo);
-
- /* Extract the code segment and opcode from the "fcs" member. */
- {
- long l;
-
- l = xfpregs->fcs & 0xffff;
- supply_register (FCS_REGNUM, (char *) &l);
-
- l = (xfpregs->fcs >> 16) & ((1 << 11) - 1);
- supply_register (FOP_REGNUM, (char *) &l);
- }
- }
-
- /* Supply the SSE registers. */
- for (reg = 0; reg < 8; reg++)
- supply_register (XMM0_REGNUM + reg, (char *) &xfpregs->xmm_space[reg]);
- supply_register (MXCSR_REGNUM, (char *) &xfpregs->mxcsr);
+ i387_supply_fxsave ((char *) fpxregsetp);
}
-/* Convert the valid floating-point and SSE registers in GDB's
- register array to `struct user' format and store them in *XFPREGS.
- The array VALID indicates which registers are valid. If VALID is
- NULL, all registers are assumed to be valid. */
+/* Fill register REGNO (if it is a floating-point or SSE register) in
+ *FPXREGSETP with the value in GDB's register array. If REGNO is
+ -1, do this for all registers. */
-static void
-convert_to_xfpregset (struct user_xfpregs_struct *xfpregs,
- signed char *valid)
+void
+fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno)
{
- int reg;
-
- /* Fill in the floating-point registers. */
- for (reg = 0; reg < 8; reg++)
- if (!valid || valid[reg])
- memcpy (&xfpregs->st_space[reg],
- ®isters[REGISTER_BYTE (FP0_REGNUM + reg)],
- REGISTER_RAW_SIZE(FP0_REGNUM + reg));
-
-#define fill(MEMBER, REGNO) \
- if (! valid || valid[(REGNO)]) \
- memcpy (&xfpregs->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \
- sizeof (xfpregs->MEMBER))
-
- fill (cwd, FCTRL_REGNUM);
- fill (swd, FSTAT_REGNUM);
- fill (twd, FTAG_REGNUM);
- fill (fip, FCOFF_REGNUM);
- fill (foo, FDOFF_REGNUM);
- fill (fos, FDS_REGNUM);
-
-#undef fill
-
- if (! valid || valid[FCS_REGNUM])
- xfpregs->fcs
- = ((xfpregs->fcs & ~0xffff)
- | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff));
-
- if (! valid || valid[FOP_REGNUM])
- xfpregs->fcs
- = ((xfpregs->fcs & 0xffff)
- | ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))
- << 16));
-
- /* Fill in the XMM registers. */
- for (reg = 0; reg < 8; reg++)
- if (! valid || valid[reg])
- memcpy (&xfpregs->xmm_space[reg],
- ®isters[REGISTER_BYTE (XMM0_REGNUM + reg)],
- REGISTER_RAW_SIZE (XMM0_REGNUM + reg));
+ i387_fill_fxsave ((char *) fpxregsetp, regno);
}
-/* Fetch all registers covered by the PTRACE_SETXFPREGS request from
+/* Fetch all registers covered by the PTRACE_GETFPXREGS request from
process/thread TID and store their values in GDB's register array.
Return non-zero if successful, zero otherwise. */
static int
-fetch_xfpregs (int tid)
+fetch_fpxregs (int tid)
{
- struct user_xfpregs_struct xfpregs;
- int ret;
+ elf_fpxregset_t fpxregs;
- if (! have_ptrace_getxfpregs)
+ if (! have_ptrace_getfpxregs)
return 0;
- ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs);
- if (ret == -1)
+ if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
{
if (errno == EIO)
{
- have_ptrace_getxfpregs = 0;
+ have_ptrace_getfpxregs = 0;
return 0;
}
- warning ("Couldn't read floating-point and SSE registers.");
- return 0;
+ perror_with_name ("Couldn't read floating-point and SSE registers");
}
- supply_xfpregset (&xfpregs);
+ supply_fpxregset (&fpxregs);
return 1;
}
/* Store all valid registers in GDB's register array covered by the
- PTRACE_SETXFPREGS request into the process/thread specified by TID.
+ PTRACE_SETFPXREGS request into the process/thread specified by TID.
Return non-zero if successful, zero otherwise. */
static int
-store_xfpregs (int tid)
+store_fpxregs (int tid, int regno)
{
- struct user_xfpregs_struct xfpregs;
- int ret;
+ elf_fpxregset_t fpxregs;
- if (! have_ptrace_getxfpregs)
+ if (! have_ptrace_getfpxregs)
return 0;
-
- ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs);
- if (ret == -1)
+
+ if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1)
{
if (errno == EIO)
{
- have_ptrace_getxfpregs = 0;
+ have_ptrace_getfpxregs = 0;
return 0;
}
- warning ("Couldn't read floating-point and SSE registers.");
- return 0;
+ perror_with_name ("Couldn't read floating-point and SSE registers");
}
- convert_to_xfpregset (&xfpregs, register_valid);
+ fill_fpxregset (&fpxregs, regno);
- if (ptrace (PTRACE_SETXFPREGS, tid, 0, &xfpregs) < 0)
- {
- warning ("Couldn't write floating-point and SSE registers.");
- return 0;
- }
+ if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1)
+ perror_with_name ("Couldn't write floating-point and SSE registers");
return 1;
}
static void
dummy_sse_values (void)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
/* C doesn't have a syntax for NaN's, so write it out as an array of
longs. */
static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff };
static long mxcsr = 0x1f80;
int reg;
- for (reg = 0; reg < 8; reg++)
+ for (reg = 0; reg < tdep->num_xmm_regs; reg++)
supply_register (XMM0_REGNUM + reg, (char *) dummy);
- supply_register (MXCSR_REGNUM, (char *) &mxcsr);
+ if (tdep->num_xmm_regs > 0)
+ supply_register (MXCSR_REGNUM, (char *) &mxcsr);
}
#else
-/* Stub versions of the above routines, for systems that don't have
- PTRACE_GETXFPREGS. */
-static int store_xfpregs (int tid) { return 0; }
-static int fetch_xfpregs (int tid) { return 0; }
+static int fetch_fpxregs (int tid) { return 0; }
+static int store_fpxregs (int tid, int regno) { return 0; }
static void dummy_sse_values (void) {}
-#endif
-
+#endif /* HAVE_PTRACE_GETFPXREGS */
\f
+
/* Transferring arbitrary registers between GDB and inferior. */
+/* Check if register REGNO in the child process is accessible.
+ If we are accessing registers directly via the U area, only the
+ general-purpose registers are available.
+ All registers should be accessible if we have GETREGS support. */
+
+int
+cannot_fetch_register (int regno)
+{
+ gdb_assert (regno >= 0 && regno < NUM_REGS);
+ return (!have_ptrace_getregs && regmap[regno] == -1);
+}
+
+int
+cannot_store_register (int regno)
+{
+ gdb_assert (regno >= 0 && regno < NUM_REGS);
+ return (!have_ptrace_getregs && regmap[regno] == -1);
+}
+
/* Fetch register REGNO from the child process. If REGNO is -1, do
this for all registers (including the floating point and SSE
registers). */
/* Use the old method of peeking around in `struct user' if the
GETREGS request isn't available. */
- if (! have_ptrace_getregs)
+ if (!have_ptrace_getregs)
{
- old_fetch_inferior_registers (regno);
+ int i;
+
+ for (i = 0; i < NUM_REGS; i++)
+ if (regno == -1 || regno == i)
+ fetch_register (i);
+
return;
}
- /* Linux LWP ID's are process ID's. */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* Not a threaded program. */
+ /* GNU/Linux LWP ID's are process ID's. */
+ if ((tid = TIDGET (inferior_ptid)) == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
- /* Use the PTRACE_GETXFPREGS request whenever possible, since it
+ /* Use the PTRACE_GETFPXREGS request whenever possible, since it
transfers more registers in one system call, and we'll cache the
- results. But remember that fetch_xfpregs can fail, and return
+ results. But remember that fetch_fpxregs can fail, and return
zero. */
if (regno == -1)
{
fetch_regs (tid);
/* The call above might reset `have_ptrace_getregs'. */
- if (! have_ptrace_getregs)
+ if (!have_ptrace_getregs)
{
- old_fetch_inferior_registers (-1);
+ fetch_inferior_registers (regno);
return;
}
- if (fetch_xfpregs (tid))
+ if (fetch_fpxregs (tid))
return;
fetch_fpregs (tid);
return;
return;
}
- if (GETXFPREGS_SUPPLIES (regno))
+ if (GETFPXREGS_SUPPLIES (regno))
{
- if (fetch_xfpregs (tid))
+ if (fetch_fpxregs (tid))
return;
/* Either our processor or our kernel doesn't support the SSE
gdbarch. Until then, this will at least make things work
plausibly. */
fetch_fpregs (tid);
- dummy_sse_values ();
return;
}
- internal_error ("i386-linux-nat.c (fetch_inferior_registers): "
- "got request for bad register number %d", regno);
+ internal_error (__FILE__, __LINE__,
+ "Got request for bad register number %d.", regno);
}
/* Store register REGNO back into the child process. If REGNO is -1,
/* Use the old method of poking around in `struct user' if the
SETREGS request isn't available. */
- if (! have_ptrace_getregs)
+ if (!have_ptrace_getregs)
{
- old_store_inferior_registers (regno);
+ int i;
+
+ for (i = 0; i < NUM_REGS; i++)
+ if (regno == -1 || regno == i)
+ store_register (i);
+
return;
}
- /* Linux LWP ID's are process ID's. */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* Not a threaded program. */
+ /* GNU/Linux LWP ID's are process ID's. */
+ if ((tid = TIDGET (inferior_ptid)) == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
- /* Use the PTRACE_SETXFPREGS requests whenever possibl, since it
+ /* Use the PTRACE_SETFPXREGS requests whenever possible, since it
transfers more registers in one system call. But remember that
- store_xfpregs can fail, and return zero. */
+ store_fpxregs can fail, and return zero. */
if (regno == -1)
{
- store_regs (tid);
- if (store_xfpregs (tid))
+ store_regs (tid, regno);
+ if (store_fpxregs (tid, regno))
return;
- store_fpregs (tid);
+ store_fpregs (tid, regno);
return;
}
if (GETREGS_SUPPLIES (regno))
{
- store_regs (tid);
+ store_regs (tid, regno);
return;
}
- if (GETXFPREGS_SUPPLIES (regno))
+ if (GETFPXREGS_SUPPLIES (regno))
{
- if (store_xfpregs (tid))
+ if (store_fpxregs (tid, regno))
return;
/* Either our processor or our kernel doesn't support the SSE
registers, so just write the FP registers in the traditional
way. */
- store_fpregs (tid);
+ store_fpregs (tid, regno);
return;
}
- internal_error ("Got request to store bad register number %d.", regno);
+ internal_error (__FILE__, __LINE__,
+ "Got request to store bad register number %d.", regno);
+}
+\f
+
+static unsigned long
+i386_linux_dr_get (int regnum)
+{
+ int tid;
+ unsigned long value;
+
+ /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
+ multi-threaded processes here. For now, pretend there is just
+ one thread. */
+ tid = PIDGET (inferior_ptid);
+
+ /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
+ ptrace call fails breaks debugging remote targets. The correct
+ way to fix this is to add the hardware breakpoint and watchpoint
+ stuff to the target vectore. For now, just return zero if the
+ ptrace call fails. */
+ errno = 0;
+ value = ptrace (PTRACE_PEEKUSER, tid,
+ offsetof (struct user, u_debugreg[regnum]), 0);
+ if (errno != 0)
+#if 0
+ perror_with_name ("Couldn't read debug register");
+#else
+ return 0;
+#endif
+
+ return value;
+}
+
+static void
+i386_linux_dr_set (int regnum, unsigned long value)
+{
+ int tid;
+
+ /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
+ multi-threaded processes here. For now, pretend there is just
+ one thread. */
+ tid = PIDGET (inferior_ptid);
+
+ errno = 0;
+ ptrace (PTRACE_POKEUSER, tid,
+ offsetof (struct user, u_debugreg[regnum]), value);
+ if (errno != 0)
+ perror_with_name ("Couldn't write debug register");
+}
+
+void
+i386_linux_dr_set_control (unsigned long control)
+{
+ i386_linux_dr_set (DR_CONTROL, control);
+}
+
+void
+i386_linux_dr_set_addr (int regnum, CORE_ADDR addr)
+{
+ gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
+
+ i386_linux_dr_set (DR_FIRSTADDR + regnum, addr);
}
+void
+i386_linux_dr_reset_addr (int regnum)
+{
+ gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
+
+ i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
+}
+
+unsigned long
+i386_linux_dr_get_status (void)
+{
+ return i386_linux_dr_get (DR_STATUS);
+}
\f
+
/* Interpreting register set info found in core files. */
/* Provide registers to GDB from a core file.
(We can't use the generic version of this function in
- core-regset.c, because Linux has *three* different kinds of
+ core-regset.c, because GNU/Linux has *three* different kinds of
register set notes. core-regset.c would have to call
- supply_xfpregset, which most platforms don't have.)
+ supply_fpxregset, which most platforms don't have.)
CORE_REG_SECT points to an array of bytes, which are the contents
of a `note' from a core file which BFD thinks might contain
WHICH says which register set corelow suspects this is:
0 --- the general-purpose register set, in elf_gregset_t format
2 --- the floating-point register set, in elf_fpregset_t format
- 3 --- the extended floating-point register set, in struct
- user_xfpregs_struct format
+ 3 --- the extended floating-point register set, in elf_fpxregset_t format
- REG_ADDR isn't used on Linux. */
+ REG_ADDR isn't used on GNU/Linux. */
static void
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
}
break;
-#ifdef HAVE_PTRACE_GETXFPREGS
+#ifdef HAVE_PTRACE_GETFPXREGS
{
- struct user_xfpregs_struct xfpregset;
+ elf_fpxregset_t fpxregset;
case 3:
- if (core_reg_size != sizeof (xfpregset))
- warning ("Wrong size user_xfpregs_struct in core file.");
+ if (core_reg_size != sizeof (fpxregset))
+ warning ("Wrong size fpxregset in core file.");
else
{
- memcpy (&xfpregset, core_reg_sect, sizeof (xfpregset));
- supply_xfpregset (&xfpregset);
+ memcpy (&fpxregset, core_reg_sect, sizeof (fpxregset));
+ supply_fpxregset (&fpxregset);
}
break;
}
break;
}
}
-
\f
-/* The instruction for a Linux system call is:
+
+/* The instruction for a GNU/Linux system call is:
int $0x80
or 0xcd 0x80. */
If SIGNAL is nonzero, give it that signal. */
void
-child_resume (int pid, int step, enum target_signal signal)
+child_resume (ptid_t ptid, int step, enum target_signal signal)
{
+ int pid = PIDGET (ptid);
+
int request = PTRACE_CONT;
if (pid == -1)
/* Resume all threads. */
/* I think this only gets used in the non-threaded case, where "resume
- all threads" and "resume inferior_pid" are the same. */
- pid = inferior_pid;
+ all threads" and "resume inferior_ptid" are the same. */
+ pid = PIDGET (inferior_ptid);
if (step)
{
- CORE_ADDR pc = read_pc_pid (pid);
+ CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid));
unsigned char buf[LINUX_SYSCALL_LEN];
request = PTRACE_SINGLESTEP;
if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0
&& memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0)
{
- int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, pid);
+ int syscall = read_register_pid (LINUX_SYSCALL_REGNUM,
+ pid_to_ptid (pid));
/* Then check the system call number. */
if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn)
CORE_ADDR sp = read_register (SP_REGNUM);
CORE_ADDR addr = sp;
unsigned long int eflags;
-
+
if (syscall == SYS_rt_sigreturn)
addr = read_memory_integer (sp + 8, 4) + 20;
if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
perror_with_name ("ptrace");
}
-
\f
-/* Calling functions in shared libraries. */
-/* FIXME: kettenis/2000-03-05: Doesn't this belong in a
- target-dependent file? The function
- `i386_linux_skip_solib_resolver' is mentioned in
- `config/i386/tm-linux.h'. */
-
-/* Find the minimal symbol named NAME, and return both the minsym
- struct and its objfile. This probably ought to be in minsym.c, but
- everything there is trying to deal with things like C++ and
- SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may
- be considered too special-purpose for general consumption. */
-
-static struct minimal_symbol *
-find_minsym_and_objfile (char *name, struct objfile **objfile_p)
-{
- struct objfile *objfile;
- ALL_OBJFILES (objfile)
- {
- struct minimal_symbol *msym;
-
- ALL_OBJFILE_MSYMBOLS (objfile, msym)
- {
- if (SYMBOL_NAME (msym)
- && STREQ (SYMBOL_NAME (msym), name))
- {
- *objfile_p = objfile;
- return msym;
- }
- }
- }
-
- return 0;
-}
-
-
-static CORE_ADDR
-skip_hurd_resolver (CORE_ADDR pc)
-{
- /* The HURD dynamic linker is part of the GNU C library, so many
- GNU/Linux distributions use it. (All ELF versions, as far as I
- know.) An unresolved PLT entry points to "_dl_runtime_resolve",
- which calls "fixup" to patch the PLT, and then passes control to
- the function.
-
- We look for the symbol `_dl_runtime_resolve', and find `fixup' in
- the same objfile. If we are at the entry point of `fixup', then
- we set a breakpoint at the return address (at the top of the
- stack), and continue.
-
- It's kind of gross to do all these checks every time we're
- called, since they don't change once the executable has gotten
- started. But this is only a temporary hack --- upcoming versions
- of Linux will provide a portable, efficient interface for
- debugging programs that use shared libraries. */
-
- struct objfile *objfile;
- struct minimal_symbol *resolver
- = find_minsym_and_objfile ("_dl_runtime_resolve", &objfile);
-
- if (resolver)
- {
- struct minimal_symbol *fixup
- = lookup_minimal_symbol ("fixup", 0, objfile);
-
- if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc)
- return (SAVED_PC_AFTER_CALL (get_current_frame ()));
- }
-
- return 0;
-}
-
-/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c.
- This function:
- 1) decides whether a PLT has sent us into the linker to resolve
- a function reference, and
- 2) if so, tells us where to set a temporary breakpoint that will
- trigger when the dynamic linker is done. */
-
-CORE_ADDR
-i386_linux_skip_solib_resolver (CORE_ADDR pc)
-{
- CORE_ADDR result;
-
- /* Plug in functions for other kinds of resolvers here. */
- result = skip_hurd_resolver (pc);
- if (result)
- return result;
-
- return 0;
-}
-
-\f
-/* Register that we are able to handle Linux ELF core file formats. */
+/* Register that we are able to handle GNU/Linux ELF core file
+ formats. */
static struct core_fns linux_elf_core_fns =
{
projects / deliverable / binutils-gdb.git / blobdiff