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| build-shared and build-static successful for i686.
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| No binary differences.
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| OK?
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| 2000-06-29 Greg McGary <greg@mcgary.org>
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|
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| * sysdeps/i386/bp-asm.h (PCOFF): New constant.
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| (POP_ERRNO_LOCATION_RETURN): Fold insns.
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| * sysdeps/i386/bits/setjmp.h (JB_SIZE): New constant.
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| (PUSH_SIGNAL_MASK): New macro.
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| * sysdeps/i386/__longjmp.S (__longjmp): Wrap symbol in BP_SYM ().
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| LEAVE is unnecessary. Check bounds of jmp_buf.
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| * sysdeps/i386/elf/setjmp.S: Call PUSH_SIGNAL_MASK.
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| Wrap symbols in BP_SYM (). Check bounds of jmp_buf.
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| Don't call LEAVE until immediately before tail-call.
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| * sysdeps/i386/setjmp.S: Likewise.
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| * sysdeps/i386/bsd-_setjmp.S: Likewise.
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| * sysdeps/i386/bsd-setjmp.S: Likewise.
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|
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| Index: sysdeps/i386/__longjmp.S
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| ===================================================================
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| ===================================================================
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| ===================================================================
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| ===================================================================
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| ===================================================================
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| ===================================================================
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| ===================================================================
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| RCS file: /cvs/glibc/libc/sysdeps/i386/elf/setjmp.S,v
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| retrieving revision 1.4
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| diff -u -p -r1.4 setjmp.S
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| --- setjmp.S 2000/06/09 06:14:39 1.4
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| +++ setjmp.S 2000/06/29 22:38:49
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| @@ -21,50 +21,49 @@
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| #define _ASM
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| #define _SETJMP_H
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| #include <bits/setjmp.h>
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| +#include "bp-sym.h"
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| #include "bp-asm.h"
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|
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| -#define PARMS LINKAGE /* no space for saved regs */
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| -#define JBUF PARMS
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| -#define SGMSK JBUF+PRT_SIZE
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| -
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| /* We include the BSD entry points here as well but we make
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| them weak. */
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| -ENTRY (setjmp)
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| - .weak C_SYMBOL_NAME (setjmp)
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| - popl %eax /* Pop return PC. */
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| - popl %ecx /* Pop jmp_buf argument. */
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| - pushl $1 /* Push second argument of zero. */
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| - pushl %ecx /* Push back first argument. */
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| - pushl %eax /* Push back return PC. */
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| +ENTRY (BP_SYM (setjmp))
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| + .weak C_SYMBOL_NAME (BP_SYM (setjmp))
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| + PUSH_SIGNAL_MASK (1)
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| /* Note that we have to use a non-exported symbol in the next
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| jump since otherwise gas will emit it as a jump through the
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| PLT which is what we cannot use here. */
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| jmp .Linternal_sigsetjmp
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| -END (setjmp)
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| +END (BP_SYM (setjmp))
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|
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| /* Binary compatibility entry point. */
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| -ENTRY (_setjmp)
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| - .weak C_SYMBOL_NAME (_setjmp)
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| -ENTRY (__setjmp)
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| - popl %eax /* Pop return address. */
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| - popl %ecx /* Pop jmp_buf. */
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| - pushl $0 /* Push zero argument. */
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| - pushl %ecx /* Push jmp_buf. */
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| - pushl %eax /* Push back return address. */
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| -
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| -ENTRY (__sigsetjmp)
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| -.Linternal_sigsetjmp = __sigsetjmp
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| - movl 4(%esp), %eax /* User's jmp_buf in %eax. */
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| +ENTRY (BP_SYM (_setjmp))
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| + .weak C_SYMBOL_NAME (BP_SYM (_setjmp))
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| +ENTRY (BP_SYM (__setjmp))
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| + PUSH_SIGNAL_MASK (0)
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| + /* FALL THROUGH */
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| +
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| +#define PARMS LINKAGE /* no space for saved regs */
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| +#define JMPBUF PARMS
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| +#define SIGMSK JMPBUF+PTR_SIZE
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| +
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| +ENTRY (BP_SYM (__sigsetjmp))
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| +.Linternal_sigsetjmp = BP_SYM (__sigsetjmp)
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| + ENTER
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| +
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| + movl JMPBUF(%esp), %eax
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| + CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE)
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| +
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| /* Save registers. */
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| movl %ebx, (JB_BX*4)(%eax)
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| movl %esi, (JB_SI*4)(%eax)
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| movl %edi, (JB_DI*4)(%eax)
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| movl %ebp, (JB_BP*4)(%eax)
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| - leal JBUF(%esp), %ecx /* Save SP as it will be after we return. */
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| + leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
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| movl %ecx, (JB_SP*4)(%eax)
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| - movl 0(%esp), %ecx /* Save PC we are returning to now. */
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| + movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
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| movl %ecx, (JB_PC*4)(%eax)
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|
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| + LEAVE /* pop frame pointer to prepare for tail-call. */
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| /* Make a tail call to __sigjmp_save; it takes the same args. */
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| #ifdef PIC
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| /* We cannot use the PLT, because it requires that %ebx be set, but
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| @@ -74,9 +73,9 @@ ENTRY (__sigsetjmp)
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| call here
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| here: popl %ecx
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| addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx
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| - movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx
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| + movl C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOT)(%ecx), %ecx
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| jmp *%ecx
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| #else
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| - jmp __sigjmp_save
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| + jmp BP_SYM (__sigjmp_save)
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| #endif
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| -END (__sigsetjmp)
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| +END (BP_SYM (__sigsetjmp))
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|
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|
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| --------------------------------------------------------------------------------
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|
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| Follow-Ups:
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| Re: PATCH: BPs for ix86 setjmp/longjmp
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| From: Ulrich Drepper
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