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authorRoland McGrath <roland@gnu.org>1995-08-31 17:33:01 +0000
committerRoland McGrath <roland@gnu.org>1995-08-31 17:33:01 +0000
commite3726b056b3b1cfde7019e29d5d3c50ce70e08e9 (patch)
tree97695fe42ef6e492efc0d3b728218746d4ccae7e /sysdeps/unix
parenta993273c0d4d1907028adee7a2ae012826fd316c (diff)
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Rewrote i386 setjmp in assembly.
Thu Aug 31 13:23:35 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>

	* sysdeps/unix/i386/brk.S [PIC]: Set __curbrk through the GOT.

	Rewrote i386 setjmp code in assembly, so as to avoid fighting
	with the compiler for the register values.
	* sysdeps/i386/setjmp.S, sysdeps/i386/__longjmp.S: New files.
	* sysdeps/i386/setjmp.c, sysdeps/i386/__longjmp.c: Files removed.
	* sysdeps/i386/jmp_buf.h [! _ASM] (__jmp_buf): Define as array of ints.
	[__USE_MISC || _ASM] (JB_*): New macros, for indices therein.
	(_JMPBUF_UNWINDS): Use JB_SP.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/i386/brk.S9
1 files changed, 9 insertions, 0 deletions
diff --git a/sysdeps/unix/i386/brk.S b/sysdeps/unix/i386/brk.S
index f55ac7c775..f1717bbf8e 100644
--- a/sysdeps/unix/i386/brk.S
+++ b/sysdeps/unix/i386/brk.S
@@ -34,7 +34,16 @@ C_LABEL(__curbrk)
 .text
 SYSCALL__ (brk, 1)
 	movl 4(%esp), %eax
+#ifdef	PIC
+	/* Standard PIC nonsense to store into `__curbrk' through the GOT.  */
+	call here
+here:	popl %ecx
+	addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx
+	movl C_SYMBOL_NAME(__curbrk@GOT)(%ecx), %ecx
+	movl %eax, (%ecx)
+#else
 	movl %eax, C_SYMBOL_NAME(__curbrk)
+#endif
 	xorl %eax, %eax
 	ret