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authorH. Peter Anvin <hpa@zytor.com>2008-03-26 16:25:35 -0700
committerH. Peter Anvin <hpa@zytor.com>2008-03-26 16:25:35 -0700
commit9eddd22a7b53b1d02fbae0d987df8af122924248 (patch)
tree882f5152880b0b1aa2d7a0619d30065acc69fb16 /gpxe/src/arch/i386/core/setjmp.S
parentbbb8f15936b851e6a0ef6f7bb2c95197bff35994 (diff)
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Add gPXE into the source tree; build unified imagesyslinux-3.70-pre7
Diffstat (limited to 'gpxe/src/arch/i386/core/setjmp.S')
-rw-r--r--gpxe/src/arch/i386/core/setjmp.S40
1 files changed, 40 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/core/setjmp.S b/gpxe/src/arch/i386/core/setjmp.S
new file mode 100644
index 00000000..59a1b7cb
--- /dev/null
+++ b/gpxe/src/arch/i386/core/setjmp.S
@@ -0,0 +1,40 @@
+/* setjmp and longjmp. Use of these functions is deprecated. */
+
+ .text
+ .arch i386
+ .code32
+
+/**************************************************************************
+SETJMP - Save stack context for non-local goto
+**************************************************************************/
+ .globl setjmp
+setjmp:
+ movl 4(%esp),%ecx /* jmpbuf */
+ movl 0(%esp),%edx /* return address */
+ movl %edx,0(%ecx)
+ movl %ebx,4(%ecx)
+ movl %esp,8(%ecx)
+ movl %ebp,12(%ecx)
+ movl %esi,16(%ecx)
+ movl %edi,20(%ecx)
+ movl $0,%eax
+ ret
+
+/**************************************************************************
+LONGJMP - Non-local jump to a saved stack context
+**************************************************************************/
+ .globl longjmp
+longjmp:
+ movl 4(%esp),%edx /* jumpbuf */
+ movl 8(%esp),%eax /* result */
+ movl 0(%edx),%ecx
+ movl 4(%edx),%ebx
+ movl 8(%edx),%esp
+ movl 12(%edx),%ebp
+ movl 16(%edx),%esi
+ movl 20(%edx),%edi
+ cmpl $0,%eax
+ jne 1f
+ movl $1,%eax
+1: movl %ecx,0(%esp)
+ ret