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authorJeff Dike <jdike@addtoit.com>2006-09-26 02:32:59 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-26 11:49:05 -0400
commit13c06be399902c9ebda08e092edb1614bb4a3761 (patch)
treec67134cfb7efd23ab7017fde32657fa3a7e58154 /arch/um/sys-x86_64/setjmp.S
parentc5c6ba4e08ab9c9e390a0f3a7d9a5c332f5cc6ef (diff)
[PATCH] uml: Use klibc setjmp/longjmp
This patch adds an implementation of setjmp and longjmp to UML, allowing access to the inside of a jmpbuf without needing the access macros formerly provided by libc. The implementation is stolen from klibc. I copy the relevant files into arch/um. I have another patch which avoids the copying, but requires klibc be in the tree. setjmp and longjmp users required some tweaking. Includes of <setjmp.h> were removed and includes of the UML longjmp.h were added where necessary. There are also replacements of siglongjmp with UML_LONGJMP which I somehow missed earlier. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/sys-x86_64/setjmp.S')
-rw-r--r--arch/um/sys-x86_64/setjmp.S54
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/um/sys-x86_64/setjmp.S b/arch/um/sys-x86_64/setjmp.S
new file mode 100644
index 000000000000..45f547b4043e
--- /dev/null
+++ b/arch/um/sys-x86_64/setjmp.S
@@ -0,0 +1,54 @@
1#
2# arch/x86_64/setjmp.S
3#
4# setjmp/longjmp for the x86-64 architecture
5#
6
7#
8# The jmp_buf is assumed to contain the following, in order:
9# %rbx
10# %rsp (post-return)
11# %rbp
12# %r12
13# %r13
14# %r14
15# %r15
16# <return address>
17#
18
19 .text
20 .align 4
21 .globl setjmp
22 .type setjmp, @function
23setjmp:
24 pop %rsi # Return address, and adjust the stack
25 xorl %eax,%eax # Return value
26 movq %rbx,(%rdi)
27 movq %rsp,8(%rdi) # Post-return %rsp!
28 push %rsi # Make the call/return stack happy
29 movq %rbp,16(%rdi)
30 movq %r12,24(%rdi)
31 movq %r13,32(%rdi)
32 movq %r14,40(%rdi)
33 movq %r15,48(%rdi)
34 movq %rsi,56(%rdi) # Return address
35 ret
36
37 .size setjmp,.-setjmp
38
39 .text
40 .align 4
41 .globl longjmp
42 .type longjmp, @function
43longjmp:
44 movl %esi,%eax # Return value (int)
45 movq (%rdi),%rbx
46 movq 8(%rdi),%rsp
47 movq 16(%rdi),%rbp
48 movq 24(%rdi),%r12
49 movq 32(%rdi),%r13
50 movq 40(%rdi),%r14
51 movq 48(%rdi),%r15
52 jmp *56(%rdi)
53
54 .size longjmp,.-longjmp