mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 12:39:23 +00:00
13c06be399
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>
59 lines
963 B
ArmAsm
59 lines
963 B
ArmAsm
#
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# arch/i386/setjmp.S
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#
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# setjmp/longjmp for the i386 architecture
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#
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#
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# The jmp_buf is assumed to contain the following, in order:
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# %ebx
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# %esp
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# %ebp
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# %esi
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# %edi
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# <return address>
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#
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.text
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.align 4
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.globl setjmp
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.type setjmp, @function
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setjmp:
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#ifdef _REGPARM
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movl %eax,%edx
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#else
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movl 4(%esp),%edx
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#endif
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popl %ecx # Return address, and adjust the stack
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xorl %eax,%eax # Return value
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movl %ebx,(%edx)
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movl %esp,4(%edx) # Post-return %esp!
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pushl %ecx # Make the call/return stack happy
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movl %ebp,8(%edx)
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movl %esi,12(%edx)
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movl %edi,16(%edx)
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movl %ecx,20(%edx) # Return address
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ret
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.size setjmp,.-setjmp
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.text
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.align 4
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.globl longjmp
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.type longjmp, @function
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longjmp:
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#ifdef _REGPARM
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xchgl %eax,%edx
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#else
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movl 4(%esp),%edx # jmp_ptr address
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movl 8(%esp),%eax # Return value
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#endif
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movl (%edx),%ebx
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movl 4(%edx),%esp
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movl 8(%edx),%ebp
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movl 12(%edx),%esi
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movl 16(%edx),%edi
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jmp *20(%edx)
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.size longjmp,.-longjmp
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