/* Native-dependent code for GNU/Linux x86-64.
- Copyright 2001, 2002 Free Software Foundation, Inc.
+ Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
Contributed by Jiri Smid, SuSE Labs.
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
-#include "i387-nat.h"
-#include "gdb_assert.h"
-#include "x86-64-tdep.h"
+#include "linux-nat.h"
+#include "gdb_assert.h"
+#include "gdb_string.h"
#include <sys/ptrace.h>
#include <sys/debugreg.h>
#include <sys/syscall.h>
#include <sys/procfs.h>
+#include <asm/prctl.h>
+/* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
+ <asm/ptrace.h> because the latter redefines FS and GS for no apparent
+ reason, and those definitions don't match the ones that libpthread_db
+ uses, which come from <sys/reg.h>. */
+/* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
+ been removed from ptrace.h in the kernel. However, better safe than
+ sorry. */
+#include <asm/ptrace.h>
#include <sys/reg.h>
+#include "gdb_proc_service.h"
-/* Mapping between the general-purpose registers in `struct user'
- format and GDB's register array layout. */
-
-static int x86_64_regmap[] = {
- RAX, RDX, RCX, RBX,
- RSI, RDI, RBP, RSP,
- R8, R9, R10, R11,
- R12, R13, R14, R15,
- RIP, EFLAGS
-};
-
-static unsigned long
-x86_64_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 (PT_READ_U, 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
-x86_64_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 (PT_WRITE_U, tid,
- offsetof (struct user, u_debugreg[regnum]), value);
- if (errno != 0)
- perror_with_name ("Couldn't write debug register");
-}
-
-void
-x86_64_linux_dr_set_control (unsigned long control)
-{
- x86_64_linux_dr_set (DR_CONTROL, control);
-}
-
-void
-x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
-{
- gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
+/* Prototypes for supply_gregset etc. */
+#include "gregset.h"
- x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
-}
-
-void
-x86_64_linux_dr_reset_addr (int regnum)
-{
- gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
-
- x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
-}
-
-unsigned long
-x86_64_linux_dr_get_status (void)
-{
- return x86_64_linux_dr_get (DR_STATUS);
-}
-\f
+#include "x86-64-tdep.h"
+#include "x86-64-linux-tdep.h"
-/* The register sets used in GNU/Linux ELF core-dumps are identical to
- the register sets used by `ptrace'. */
+/* Which ptrace request retrieves which registers?
+ These apply to the corresponding SET requests as well. */
#define GETREGS_SUPPLIES(regno) \
- (0 <= (regno) && (regno) <= 17)
+ (0 <= (regno) && (regno) < X86_64_NUM_GREGS)
+
#define GETFPREGS_SUPPLIES(regno) \
(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
-
-#define PTRACE_XFER_TYPE unsigned long
\f
/* Transfering the general-purpose registers between GDB, inferiors
in *GREGSETP. */
void
-supply_gregset (elf_gregset_t * gregsetp)
+supply_gregset (elf_gregset_t *gregsetp)
{
- elf_greg_t *regp = (elf_greg_t *) gregsetp;
- int i;
-
- for (i = 0; i < X86_64_NUM_GREGS; i++)
- supply_register (i, (char *) (regp + x86_64_regmap[i]));
+ x86_64_linux_supply_gregset ((char *) gregsetp);
}
/* Fill register REGNO (if it is a general-purpose register) in
do this for all registers. */
void
-fill_gregset (elf_gregset_t * gregsetp, int regno)
+fill_gregset (elf_gregset_t *gregsetp, int regno)
{
- elf_greg_t *regp = (elf_greg_t *) gregsetp;
- int i;
-
- for (i = 0; i < X86_64_NUM_GREGS; i++)
- if ((regno == -1 || regno == i))
- read_register_gen (i, regp + x86_64_regmap[i]);
+ x86_64_linux_fill_gregset ((char *) gregsetp, regno);
}
/* Fetch all general-purpose registers from process/thread TID and
elf_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
- perror_with_name ("Couldn't get registers");
+ perror_with_name ("Couldn't get registers");
supply_gregset (®s);
}
/* Transfering floating-point registers between GDB, inferiors and cores. */
-/* Fill GDB's register array with the floating-point register values in
- *FPREGSETP. */
+/* Fill GDB's register array with the floating-point and SSE register
+ values in *FPREGSETP. */
void
-supply_fpregset (elf_fpregset_t * fpregsetp)
+supply_fpregset (elf_fpregset_t *fpregsetp)
{
- i387_supply_fxsave ((char *) fpregsetp);
+ x86_64_supply_fxsave ((char *) fpregsetp);
}
-/* Fill register REGNO (if it is a floating-point register) in
- *FPREGSETP with the value in GDB's register array. If REGNO is -1,
- do this for all registers. */
+/* Fill register REGNUM (if it is a floating-point or SSE register) in
+ *FPREGSETP with the value in GDB's register array. If REGNUM is
+ -1, do this for all registers. */
void
-fill_fpregset (elf_fpregset_t * fpregsetp, int regno)
+fill_fpregset (elf_fpregset_t *fpregsetp, int regnum)
{
- i387_fill_fxsave ((char *) fpregsetp, regno);
+ x86_64_fill_fxsave ((char *) fpregsetp, regnum);
}
/* Fetch all floating-point registers from process/thread TID and store
int tid;
/* GNU/Linux LWP ID's are process ID's. */
- if ((tid = TIDGET (inferior_ptid)) == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
if (regno == -1)
{
}
/* Store register REGNO back into the child process. If REGNO is -1,
- do this for all registers (including the floating point and SSE
+ do this for all registers (including the floating-point and SSE
registers). */
+
void
store_inferior_registers (int regno)
{
int tid;
/* GNU/Linux LWP ID's are process ID's. */
- if ((tid = TIDGET (inferior_ptid)) == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
if (regno == -1)
{
}
\f
-static const unsigned char linux_syscall[] = { 0x0f, 0x05 };
-
-#define LINUX_SYSCALL_LEN (sizeof linux_syscall)
-
-/* The system call number is stored in the %rax register. */
-#define LINUX_SYSCALL_REGNUM 0 /* %rax */
+static unsigned long
+x86_64_linux_dr_get (int regnum)
+{
+ int tid;
+ unsigned long value;
-/* We are specifically interested in the sigreturn and rt_sigreturn
- system calls. */
+ /* 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);
-#ifndef SYS_sigreturn
-#define SYS_sigreturn __NR_sigreturn
-#endif
-#ifndef SYS_rt_sigreturn
-#define SYS_rt_sigreturn __NR_rt_sigreturn
+ /* 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 (PT_READ_U, 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
-/* Offset to saved processor flags, from <asm/sigcontext.h>. */
-#define LINUX_SIGCONTEXT_EFLAGS_OFFSET (152)
-/* Offset to saved processor registers from <asm/ucontext.h> */
-#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36)
-
-/* Resume execution of the inferior process.
- If STEP is nonzero, single-step it.
- If SIGNAL is nonzero, give it that signal. */
+ return value;
+}
-void
-child_resume (ptid_t ptid, int step, enum target_signal signal)
+static void
+x86_64_linux_dr_set (int regnum, unsigned long value)
{
- 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_ptid" are the same. */
- pid = PIDGET (inferior_ptid);
+ int tid;
- if (step)
- {
- CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid));
- unsigned char buf[LINUX_SYSCALL_LEN];
-
- request = PTRACE_SINGLESTEP;
-
- /* Returning from a signal trampoline is done by calling a
- special system call (sigreturn or rt_sigreturn, see
- i386-linux-tdep.c for more information). This system call
- restores the registers that were saved when the signal was
- raised, including %eflags. That means that single-stepping
- won't work. Instead, we'll have to modify the signal context
- that's about to be restored, and set the trace flag there. */
-
- /* First check if PC is at a system call. */
- 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_to_ptid (pid));
-
- /* Then check the system call number. */
- if (syscall == SYS_rt_sigreturn)
- {
- CORE_ADDR sp = read_register (SP_REGNUM);
- CORE_ADDR addr = sp;
- unsigned long int eflags;
-
- addr +=
- sizeof (struct siginfo) + LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
-
- /* Set the trace flag in the context that's about to be
- restored. */
- addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET;
- read_memory (addr, (char *) &eflags, 8);
- eflags |= 0x0100;
- write_memory (addr, (char *) &eflags, 8);
- }
- }
- }
+ /* 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);
- if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
- perror_with_name ("ptrace");
+ errno = 0;
+ ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value);
+ if (errno != 0)
+ perror_with_name ("Couldn't write debug register");
}
-\f
-
-/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
- to debugger memory starting at MYADDR. Copy to inferior if
- WRITE is nonzero. TARGET is ignored.
-
- Returns the length copied, which is either the LEN argument or zero.
- This xfer function does not do partial moves, since child_ops
- doesn't allow memory operations to cross below us in the target stack
- anyway. */
-int
-child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
- struct mem_attrib *attrib, struct target_ops *target)
+void
+x86_64_linux_dr_set_control (unsigned long control)
{
- register int i;
- /* Round starting address down to longword boundary. */
- register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE);
- /* Round ending address up; get number of longwords that makes. */
- register int count
- = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
- / sizeof (PTRACE_XFER_TYPE);
- /* Allocate buffer of that many longwords. */
- /* FIXME (alloca): This code, cloned from infptrace.c, is unsafe
- because it uses alloca to allocate a buffer of arbitrary size.
- For very large xfers, this could crash GDB's stack. */
- register PTRACE_XFER_TYPE *buffer
- = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
-
- if (write)
- {
- /* Fill start and end extra bytes of buffer with existing memory data. */
- if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE))
- {
- /* Need part of initial word -- fetch it. */
- ptrace (PT_READ_I, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) addr, buffer);
- }
-
- if (count > 1) /* FIXME, avoid if even boundary */
- {
- ptrace (PT_READ_I, PIDGET (inferior_ptid),
- ((PTRACE_ARG3_TYPE)
- (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))),
- buffer + count - 1);
- }
-
- /* Copy data to be written over corresponding part of buffer */
-
- memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
- myaddr, len);
-
- /* Write the entire buffer. */
-
- for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) addr, buffer[i]);
- if (errno)
- {
- /* Using the appropriate one (I or D) is necessary for
- Gould NP1, at least. */
- errno = 0;
- ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) addr, buffer[i]);
- }
- if (errno)
- return 0;
- }
-#ifdef CLEAR_INSN_CACHE
- CLEAR_INSN_CACHE ();
-#endif
- }
- else
- {
- /* Read all the longwords */
- for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- ptrace (PT_READ_I, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) addr, buffer + i);
- if (errno)
- return 0;
- }
-
- /* Copy appropriate bytes out of the buffer. */
- memcpy (myaddr,
- (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
- len);
- }
- return len;
+ x86_64_linux_dr_set (DR_CONTROL, control);
}
-/* Interpreting register set info found in core files. */
-
-/* Provide registers to GDB from a core file.
-
- 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
- register contents. CORE_REG_SIZE is its size.
-
- 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
+void
+x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
+{
+ gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- REG_ADDR isn't used on GNU/Linux. */
+ x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
+}
-static void
-fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
- int which, CORE_ADDR reg_addr)
+void
+x86_64_linux_dr_reset_addr (int regnum)
{
- elf_gregset_t gregset;
- elf_fpregset_t fpregset;
- switch (which)
- {
- case 0:
- if (core_reg_size != sizeof (gregset))
- warning ("Wrong size gregset in core file.");
- else
- {
- memcpy (&gregset, core_reg_sect, sizeof (gregset));
- supply_gregset (&gregset);
- }
- break;
-
- case 2:
- if (core_reg_size != sizeof (fpregset))
- warning ("Wrong size fpregset in core file.");
- else
- {
- memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
- supply_fpregset (&fpregset);
- }
- break;
+ gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- default:
- /* We've covered all the kinds of registers we know about here,
- so this must be something we wouldn't know what to do with
- anyway. Just ignore it. */
- break;
- }
+ x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
}
-/* Register that we are able to handle GNU/Linux ELF core file formats. */
+unsigned long
+x86_64_linux_dr_get_status (void)
+{
+ return x86_64_linux_dr_get (DR_STATUS);
+}
-static struct core_fns linux_elf_core_fns = {
- bfd_target_elf_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_core_registers, /* core_read_registers */
- NULL /* next */
-};
-\f
+extern ps_err_e
+ps_get_thread_area (const struct ps_prochandle *ph,
+ lwpid_t lwpid, int idx, void **base)
+{
-#if !defined (offsetof)
-#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
+/* This definition comes from prctl.h, but some kernels may not have it. */
+#ifndef PTRACE_ARCH_PRCTL
+#define PTRACE_ARCH_PRCTL 30
#endif
-/* Record the value of the debug control register. */
-static long debug_control_mirror;
-
-/* Record which address associates with which register. */
-static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
-
-/* Return the address of register REGNUM. BLOCKEND is the value of
- u.u_ar0, which should point to the registers. */
-CORE_ADDR
-x86_64_register_u_addr (CORE_ADDR blockend, int regnum)
-{
- struct user u;
- CORE_ADDR fpstate;
- CORE_ADDR ubase;
- ubase = blockend;
- if (IS_FP_REGNUM(regnum))
- {
- fpstate = ubase + ((char *) &u.i387.st_space - (char *) &u);
- return (fpstate + 16 * (regnum - FP0_REGNUM));
- }
- else if (IS_SSE_REGNUM(regnum))
+ /* FIXME: ezannoni-2003-07-09 see comment above about include file order.
+ We could be getting bogus values for these two. */
+ gdb_assert (FS < ELF_NGREG);
+ gdb_assert (GS < ELF_NGREG);
+ switch (idx)
{
- fpstate = ubase + ((char *) &u.i387.xmm_space - (char *) &u);
- return (fpstate + 16 * (regnum - XMM0_REGNUM));
+ case FS:
+ if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
+ return PS_OK;
+ break;
+ case GS:
+ if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
+ return PS_OK;
+ break;
+ default: /* Should not happen. */
+ return PS_BADADDR;
}
- else
- return (ubase + 8 * x86_64_regmap[regnum]);
+ return PS_ERR; /* ptrace failed. */
}
void
-_initialize_x86_64_linux_nat (void)
+child_post_startup_inferior (ptid_t ptid)
{
- add_core_fns (&linux_elf_core_fns);
+ i386_cleanup_dregs ();
+ linux_child_post_startup_inferior (ptid);
}
projects / deliverable / binutils-gdb.git / blobdiff