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Save call-clobbered registers in _mcount on 32-bit Solaris/x86 (PR target/38239)

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PR target/38239
	* config/sol2/gmon.c [__i386__] (_mcount): Save and restore
	call-clobbered registers.
	(internal_mcount): Remove __i386__ handling.

From-SVN: r234256
This commit is contained in:
Rainer Orth 2016-03-16 11:57:02 +00:00 committed by Rainer Orth
parent 197adb6983
commit a5046f48b3
2 changed files with 19 additions and 24 deletions
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7
libgcc/ChangeLog
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@ -1,3 +1,10 @@
2016-03-16 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
PR target/38239
* config/sol2/gmon.c [__i386__] (_mcount): Save and restore
call-clobbered registers.
(internal_mcount): Remove __i386__ handling.
2016-02-26 Joel Sherrill <joel@rtems.org>
* config.host: Add x86_64-*-rtems*.

36
libgcc/config/sol2/gmon.c
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@ -44,11 +44,7 @@
extern void monstartup (char *, char *);
extern void _mcleanup (void);
#ifdef __i386__
static void internal_mcount (void) __attribute__ ((used));
#else
static void internal_mcount (char *, unsigned short *) __attribute__ ((used));
#endif
static void moncontrol (int);
struct phdr {
@ -223,8 +219,19 @@ _mcleanup (void)
/* Solaris 2 libraries use _mcount. */
#if defined __i386__
asm(".globl _mcount\n"
" .type _mcount, @function\n"
"_mcount:\n"
" jmp internal_mcount\n");
/* Save and restore the call-clobbered registers. */
" pushl %eax\n"
" pushl %ecx\n"
" pushl %edx\n"
" movl 12(%esp), %edx\n"
" movl 4(%ebp), %eax\n"
" call internal_mcount\n"
" popl %edx\n"
" popl %ecx\n"
" popl %eax\n"
" ret\n");
#elif defined __x86_64__
/* See GLIBC for additional information about this technique. */
asm(".globl _mcount\n"
@ -299,32 +306,13 @@ asm(".global _mcount\n"
#endif
static void
#ifdef __i386__
internal_mcount (void)
#else
internal_mcount (char *selfpc, unsigned short *frompcindex)
#endif
{
struct tostruct *top;
struct tostruct *prevtop;
long toindex;
static char already_setup;
#ifdef __i386__
char *selfpc;
unsigned short *frompcindex;
/* Find the return address for mcount and the return address for mcount's
caller. */
/* selfpc = pc pushed by mcount call.
This identifies the function that was just entered. */
selfpc = (void *) __builtin_return_address (0);
/* frompcindex = pc in preceding frame.
This identifies the caller of the function just entered. */
frompcindex = (void *) __builtin_return_address (1);
#endif
/* Only necessary without the Solaris CRTs or a proper gcrt1.o, otherwise
crtpg.o or gcrt1.o take care of that.