diff options
Diffstat (limited to 'libc/sysdeps/linux/mips/sigaction.c')
| -rw-r--r-- | libc/sysdeps/linux/mips/sigaction.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/mips/sigaction.c b/libc/sysdeps/linux/mips/sigaction.c index e1eca78fe..f4b5167d6 100644 --- a/libc/sysdeps/linux/mips/sigaction.c +++ b/libc/sysdeps/linux/mips/sigaction.c @@ -33,6 +33,16 @@ extern __typeof(sigaction) __libc_sigaction; libc_hidden_proto(memcpy) +#if _MIPS_SIM != _ABIO32 + +# ifdef __NR_rt_sigreturn +static void restore_rt (void) asm ("__restore_rt"); +# endif +# ifdef __NR_sigreturn +static void restore (void) asm ("__restore"); +# endif +#endif + /* If ACT is not NULL, change the action for SIG to *ACT. If OACT is not NULL, put the old action for SIG in *OACT. */ int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact) @@ -119,3 +129,31 @@ libc_hidden_proto(sigaction) weak_alias(__libc_sigaction,sigaction) libc_hidden_weak(sigaction) #endif + +/* NOTE: Please think twice before making any changes to the bits of + code below. GDB needs some intimate knowledge about it to + recognize them as signal trampolines, and make backtraces through + signal handlers work right. Important are both the names + (__restore_rt) and the exact instruction sequence. + If you ever feel the need to make any changes, please notify the + appropriate GDB maintainer. */ + +#define RESTORE(name, syscall) RESTORE2 (name, syscall) +#define RESTORE2(name, syscall) \ +asm \ + ( \ + ".align 4\n" \ + "__" #name ":\n" \ + " li $2, " #syscall "\n" \ + " syscall\n" \ + ); + +/* The return code for realtime-signals. */ +#if _MIPS_SIM != _ABIO32 +# ifdef __NR_rt_sigreturn +RESTORE (restore_rt, __NR_rt_sigreturn) +# endif +# ifdef __NR_sigreturn +RESTORE (restore, __NR_sigreturn) +# endif +#endif |