espressif/binutils-gdb
1
0
Fork 0
mirror of https://github.com/espressif/binutils-gdb.git synced 2025-10-16 12:24:19 +08:00
Code Issues Packages Projects Releases Wiki Activity

2000-03-05 Mark Kettenis <kettenis@gnu.org>

Browse Source 
Allow GDB to run on Linux 2.0 again.
	* config.in: Add HAVE_PTRACE_GETREGS.
	* configure.in: Check if <sys/ptrace.h> defines PTRACE_GETREGS.
	* configure: Regenerated.
	* config/i386/nm-linux.h (CANNOT_FETCH_REGISTER,
	CANNOT_STORE_REGISTER): New defines.
	* i386-linux-nat.c (have_ptrace_getregs): New variable.
	(PTRACE_XFER_TYPE, CANNOT_FETCH_REGISTER, fetch_register,
	old_fetch_inferior_registers, CANNOT_STORE_REGISTER,
	store_register, old_store_inferior_registers): Copied over from
	`inptrace.c' as a temporary measure.
	(fetch_regs, store_regs, fetch_fpregs, store_fpregs):
	Conditionalize on HAVE_PTRACE_GETREGS.  Define stubs if
	HAVE_PTRACE_GETREGS isn't defined.
	(fetch_regs): Reset `have_ptrace_getregs' if ptrace call fails
	with EIO.
	(fetch_inferior_registers, store_inferior_registers): Fall back on
	the method use in `infptrace.c' (by calling
	old_fetch_inferior_registers and old_store_inferior_registers) if
	`have_ptrace_getregs' isn't set.
This commit is contained in:
Mark Kettenis
2000-03-05 22:57:06 +00:00
parent 04cd15b61d
commit f60300e72c
4 changed files with 234 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

210
gdb/i386-linux-nat.c
View File

@ -79,6 +79,15 @@ static int regmap[] =
#define GETXFPREGS_SUPPLIES(regno) \
(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
/* Does the current host support the GETREGS request? */
int have_ptrace_getregs =
#ifdef HAVE_PTRACE_GETREGS
1
#else
0
#endif
;
/* Does the current host support the GETXFPREGS 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.
@ -102,6 +111,157 @@ int have_ptrace_getxfpregs =
#endif
;
/* 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. */
/* 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
/* Fetch one register. */
static void
fetch_register (regno)
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. */
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);
}
/* 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). */
void
old_fetch_inferior_registers (regno)
int regno;
{
if (regno >= 0)
{
fetch_register (regno);
}
else
{
for (regno = 0; regno < ARCH_NUM_REGS; regno++)
{
fetch_register (regno);
}
}
}
/* Registers we shouldn't try to store. */
#if !defined (CANNOT_STORE_REGISTER)
#define CANNOT_STORE_REGISTER(regno) 0
#endif
/* Store one register. */
static void
store_register (regno)
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;
if (CANNOT_STORE_REGISTER (regno))
{
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 (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);
}
}
}
/* 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). */
void
old_store_inferior_registers (regno)
int regno;
{
if (regno >= 0)
{
store_register (regno);
}
else
{
for (regno = 0; regno < ARCH_NUM_REGS; regno++)
{
store_register (regno);
}
}
}
/* Transfering the general-purpose registers between GDB, inferiors
and core files. */
@ -158,6 +318,8 @@ fill_gregset (elf_gregset_t *gregsetp, int regno)
}
}
#ifdef HAVE_PTRACE_GETREGS
/* Fetch all general-purpose registers from process/thread TID and
store their values in GDB's register array. */
@ -170,6 +332,14 @@ fetch_regs (int tid)
ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &regs);
if (ret < 0)
{
if (errno == EIO)
{
/* The kernel we're running on doesn't support the GETREGS
request. Reset `have_ptrace_getregs'. */
have_ptrace_getregs = 0;
return;
}
warning ("Couldn't get registers.");
return;
}
@ -203,6 +373,13 @@ store_regs (int tid)
}
}
#else
static void fetch_regs (int tid) {}
static void store_regs (int tid) {}
#endif
/* Transfering floating-point registers between GDB, inferiors and cores. */
@ -307,6 +484,8 @@ fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
}
}
#ifdef HAVE_PTRACE_GETREGS
/* Fetch all floating-point registers from process/thread TID and store
thier values in GDB's register array. */
@ -352,6 +531,13 @@ store_fpregs (int tid)
}
}
#else
static void fetch_fpregs (int tid) {}
static void store_fpregs (int tid) {}
#endif
/* Transfering floating-point and SSE registers to and from GDB. */
@ -561,6 +747,14 @@ fetch_inferior_registers (int regno)
{
int tid;
/* Use the old method of peeking around in `struct user' if the
GETREGS request isn't available. */
if (! have_ptrace_getregs)
{
old_fetch_inferior_registers (regno);
return;
}
/* Linux LWP ID's are process ID's. */
if ((tid = TIDGET (inferior_pid)) == 0)
tid = inferior_pid; /* Not a threaded program. */
@ -572,6 +766,14 @@ fetch_inferior_registers (int regno)
if (regno == -1)
{
fetch_regs (tid);
/* The call above might reset `have_ptrace_getregs'. */
if (! have_ptrace_getregs)
{
old_fetch_inferior_registers (-1);
return;
}
if (fetch_xfpregs (tid))
return;
fetch_fpregs (tid);
@ -612,6 +814,14 @@ store_inferior_registers (int regno)
{
int tid;
/* Use the old method of poking around in `struct user' if the
SETREGS request isn't available. */
if (! have_ptrace_getregs)
{
old_store_inferior_registers (regno);
return;
}
/* Linux LWP ID's are process ID's. */
if ((tid = TIDGET (inferior_pid)) == 0)
tid = inferior_pid; /* Not a threaded program. */