diff options
Diffstat (limited to 'arch/x86/um/setjmp_32.S')
| -rw-r--r-- | arch/x86/um/setjmp_32.S | 59 |
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 |