| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | # |
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| 3 | # arch/i386/setjmp.S |
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| 4 | # |
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| 5 | # setjmp/longjmp for the i386 architecture |
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| 6 | # |
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| 7 | |
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| 8 | # |
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| 9 | # The jmp_buf is assumed to contain the following, in order: |
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| 10 | # %ebx |
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| 11 | # %esp |
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| 12 | # %ebp |
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| 13 | # %esi |
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| 14 | # %edi |
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| 15 | # <return address> |
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| 16 | # |
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| 17 | |
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| 18 | .text |
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| 19 | .align 4 |
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| 20 | .globl kernel_setjmp |
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| 21 | .type kernel_setjmp, @function |
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| 22 | kernel_setjmp: |
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| 23 | #ifdef _REGPARM |
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| 24 | movl %eax,%edx |
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| 25 | #else |
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| 26 | movl 4(%esp),%edx |
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| 27 | #endif |
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| 28 | popl %ecx # Return address, and adjust the stack |
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| 29 | xorl %eax,%eax # Return value |
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| 30 | movl %ebx,(%edx) |
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| 31 | movl %esp,4(%edx) # Post-return %esp! |
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| 32 | pushl %ecx # Make the call/return stack happy |
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| 33 | movl %ebp,8(%edx) |
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| 34 | movl %esi,12(%edx) |
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| 35 | movl %edi,16(%edx) |
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| 36 | movl %ecx,20(%edx) # Return address |
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| 37 | RET |
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| 38 | |
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| 39 | .size kernel_setjmp,.-kernel_setjmp |
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| 40 | |
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| 41 | .text |
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| 42 | .align 4 |
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| 43 | .globl kernel_longjmp |
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| 44 | .type kernel_longjmp, @function |
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| 45 | kernel_longjmp: |
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| 46 | #ifdef _REGPARM |
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| 47 | xchgl %eax,%edx |
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| 48 | #else |
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| 49 | movl 4(%esp),%edx # jmp_ptr address |
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| 50 | movl 8(%esp),%eax # Return value |
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| 51 | #endif |
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| 52 | movl (%edx),%ebx |
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| 53 | movl 4(%edx),%esp |
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| 54 | movl 8(%edx),%ebp |
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| 55 | movl 12(%edx),%esi |
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| 56 | movl 16(%edx),%edi |
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| 57 | jmp *20(%edx) |
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| 58 | |
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| 59 | .size kernel_longjmp,.-kernel_longjmp |
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| 60 | |
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