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Add support for "orig_eax" pseudo register on Linux/x86.

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* i386-linux-tdep.c: Include "inferior.h".
(i386_linux_register_name, i386_linux_register_byte,
i386_linux_register_raw_size): New functions.
(i386_linux_write_pc): New function.
* config/i386/tm-linux.h (I386_LINUX_ORIG_EAX_REGNUM): New define.
(NUM_REGS, MAX_NUM_REGS, REGISTER_BYTES, REGISTER_NAME,
REGISTER_BYTE, REGISTER_RAW_SIZE): Define to deal with additional
register.
(i386_linux_register_name, i386_linux_register_byte,
i386_linux_register_raw_size): New prototypes.
(TARGET_WRITE_PC): New define.
(i386_linux_write_pc): New prototype.
This commit is contained in:
Mark Kettenis
2001-11-04 14:06:16 +00:00
parent 1a11ba71e2
commit 6441c4a026
3 changed files with 104 additions and 1 deletions
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59
gdb/i386-linux-tdep.c
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@@ -23,6 +23,7 @@
#include "frame.h"
#include "value.h"
#include "regcache.h"
#include "inferior.h"
/* For i386_linux_skip_solib_resolver. */
#include "symtab.h"
@@ -31,6 +32,38 @@
#include "solib-svr4.h" /* For struct link_map_offsets. */
/* Return the name of register REG. */
char *
i386_linux_register_name (int reg)
{
/* Deal with the extra "orig_eax" pseudo register. */
if (reg == I386_LINUX_ORIG_EAX_REGNUM)
return "orig_eax";
return i386_register_name (reg);
}
int
i386_linux_register_byte (int reg)
{
/* Deal with the extra "orig_eax" pseudo register. */
if (reg == I386_LINUX_ORIG_EAX_REGNUM)
return (i386_register_byte (I386_LINUX_ORIG_EAX_REGNUM - 1)
+ i386_register_raw_size (I386_LINUX_ORIG_EAX_REGNUM - 1));
return i386_register_byte (reg);
}
int
i386_linux_register_raw_size (int reg)
{
/* Deal with the extra "orig_eax" pseudo register. */
if (reg == I386_LINUX_ORIG_EAX_REGNUM)
return 4;
return i386_register_raw_size (reg);
}
/* Recognizing signal handler frames. */
@@ -342,9 +375,33 @@ i386_linux_saved_pc_after_call (struct frame_info *frame)
return read_memory_unsigned_integer (read_register (SP_REGNUM), 4);
}
/* Set the program counter for process PTID to PC. */
void
i386_linux_write_pc (CORE_ADDR pc, ptid_t ptid)
{
write_register_pid (PC_REGNUM, pc, ptid);
/* We must be careful with modifying the program counter. If we
just interrupted a system call, the kernel might try to restart
it when we resume the inferior. On restarting the system call,
the kernel will try backing up the program counter even though it
no longer points at the system call. This typically results in a
SIGSEGV or SIGILL. We can prevent this by writing `-1' in the
"orig_eax" pseudo-register.
Note that "orig_eax" is saved when setting up a dummy call frame.
This means that it is properly restored when that frame is
popped, and that the interrupted system call will be restarted
when we resume the inferior on return from a function call from
within GDB. In all other cases the system call will not be
restarted. */
write_register_pid (I386_LINUX_ORIG_EAX_REGNUM, -1, ptid);
}
/* Calling functions in shared libraries. */
/* 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