u-boot/arch/x86/cpu/i386/setjmp.S
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

60 lines
1.1 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Written by H. Peter Anvin <hpa@zytor.com>
* Brought in from Linux v4.4 and modified for U-Boot
* From Linux arch/um/sys-i386/setjmp.S
*/
#define _REGPARM
/*
* The jmp_buf is assumed to contain the following, in order:
* %ebx
* %esp
* %ebp
* %esi
* %edi
* <return address>
*/
.text
.align 4
.globl setjmp
.type setjmp, @function
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
/* Provide function size if needed */
.size setjmp, .-setjmp
.align 4
.globl longjmp
.type longjmp, @function
longjmp:
#ifdef _REGPARM
xchgl %eax, %edx
#else
movl 4(%esp), %edx /* jmp_ptr address */
#endif
movl (%edx), %ebx
movl 4(%edx), %esp
movl 8(%edx), %ebp
movl 12(%edx), %esi
movl 16(%edx), %edi
jmp *20(%edx)
.size longjmp, .-longjmp