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Pointed out by Anton Blanchard <anton@samba.org>.

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* ppc-linux-tdep.c (insn_is_sigreturn): New function.
	(ppc_linux_at_sigtramp_return_path): Use it.
This commit is contained in:
Daniel Jacobowitz 2003-02-04 18:21:29 +00:00
parent 2de7ced707
commit a2d356b075
2 changed files with 32 additions and 6 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2003-02-04 Daniel Jacobowitz <drow@mvista.com>
Pointed out by Anton Blanchard <anton@samba.org>.
* ppc-linux-tdep.c (insn_is_sigreturn): New function.
(ppc_linux_at_sigtramp_return_path): Use it.
2003-02-04 Daniel Jacobowitz <drow@mvista.com> 2003-02-04 Daniel Jacobowitz <drow@mvista.com>
* defs.h (streq): Add prototype. * defs.h (streq): Add prototype.

32
gdb/ppc-linux-tdep.c
View file

@ -36,10 +36,15 @@
#include "solib-svr4.h" #include "solib-svr4.h"
#include "ppc-tdep.h" #include "ppc-tdep.h"
/* The following two instructions are used in the signal trampoline /* The following instructions are used in the signal trampoline code
code on GNU/Linux PPC. */ on GNU/Linux PPC. The kernel used to use magic syscalls 0x6666 and
#define INSTR_LI_R0_0x7777 0x38007777 0x7777 but now uses the sigreturn syscalls. We check for both. */
#define INSTR_SC 0x44000002 #define INSTR_LI_R0_0x6666 0x38006666
#define INSTR_LI_R0_0x7777 0x38007777
#define INSTR_LI_R0_NR_sigreturn 0x38000077
#define INSTR_LI_R0_NR_rt_sigreturn 0x380000AC
#define INSTR_SC 0x44000002
/* Since the *-tdep.c files are platform independent (i.e, they may be /* Since the *-tdep.c files are platform independent (i.e, they may be
used to build cross platform debuggers), we can't include system used to build cross platform debuggers), we can't include system
@ -183,6 +188,21 @@ ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
return (pc == handler || pc == handler + 4); return (pc == handler || pc == handler + 4);
} }
static inline int
insn_is_sigreturn (unsigned long pcinsn)
{
switch(pcinsn)
{
case INSTR_LI_R0_0x6666:
case INSTR_LI_R0_0x7777:
case INSTR_LI_R0_NR_sigreturn:
case INSTR_LI_R0_NR_rt_sigreturn:
return 1;
default:
return 0;
}
}
/* /*
* The signal handler trampoline is on the stack and consists of exactly * The signal handler trampoline is on the stack and consists of exactly
* two instructions. The easiest and most accurate way of determining * two instructions. The easiest and most accurate way of determining
@ -202,11 +222,11 @@ ppc_linux_at_sigtramp_return_path (CORE_ADDR pc)
pcinsn = extract_unsigned_integer (buf + 4, 4); pcinsn = extract_unsigned_integer (buf + 4, 4);
return ( return (
(pcinsn == INSTR_LI_R0_0x7777 (insn_is_sigreturn (pcinsn)
&& extract_unsigned_integer (buf + 8, 4) == INSTR_SC) && extract_unsigned_integer (buf + 8, 4) == INSTR_SC)
|| ||
(pcinsn == INSTR_SC (pcinsn == INSTR_SC
&& extract_unsigned_integer (buf, 4) == INSTR_LI_R0_0x7777)); && insn_is_sigreturn (extract_unsigned_integer (buf, 4))));
} }
CORE_ADDR CORE_ADDR