summaryrefslogtreecommitdiffstats
path: root/arch/x86/um/setjmp_32.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/um/setjmp_32.S')
-rw-r--r--arch/x86/um/setjmp_32.S59
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/x86/um/setjmp_32.S b/arch/x86/um/setjmp_32.S
new file mode 100644
index 000000000..2d991ddbc
--- /dev/null
+++ b/arch/x86/um/setjmp_32.S
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#
+# arch/i386/setjmp.S
+#
+# setjmp/longjmp for the i386 architecture
+#
+
+#
+# The jmp_buf is assumed to contain the following, in order:
+# %ebx
+# %esp
+# %ebp
+# %esi
+# %edi
+# <return address>
+#
+
+ .text
+ .align 4
+ .globl kernel_setjmp
+ .type kernel_setjmp, @function
+kernel_setjmp:
+#ifdef _REGPARM
+ movl %eax,%edx
+#else
+ movl 4(%esp),%edx
+#endif
+ popl %ecx # Return address, and adjust the stack
+ xorl %eax,%eax # Return value
+ movl %ebx,(%edx)
+ movl %esp,4(%edx) # Post-return %esp!
+ pushl %ecx # Make the call/return stack happy
+ movl %ebp,8(%edx)
+ movl %esi,12(%edx)
+ movl %edi,16(%edx)
+ movl %ecx,20(%edx) # Return address
+ RET
+
+ .size kernel_setjmp,.-kernel_setjmp
+
+ .text
+ .align 4
+ .globl kernel_longjmp
+ .type kernel_longjmp, @function
+kernel_longjmp:
+#ifdef _REGPARM
+ xchgl %eax,%edx
+#else
+ movl 4(%esp),%edx # jmp_ptr address
+ movl 8(%esp),%eax # Return value
+#endif
+ movl (%edx),%ebx
+ movl 4(%edx),%esp
+ movl 8(%edx),%ebp
+ movl 12(%edx),%esi
+ movl 16(%edx),%edi
+ jmp *20(%edx)
+
+ .size kernel_longjmp,.-kernel_longjmp