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x86: Add 64-bit setjmp/longjmp implementation

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Add setjmp/longjmp functions for x86_64.

Signed-off-by: Ivan Gorinov <ivan.gorinov@intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Ivan Gorinov 2018-06-19 11:40:42 -07:00 committed by Bin Meng
parent cbd29ef9f1
commit 964927323f
3 changed files with 66 additions and 19 deletions
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49
arch/x86/cpu/x86_64/setjmp.S Normal file
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@ -0,0 +1,49 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2018 Intel Corporation
*
* See arch/x86/include/asm/setjmp.h for jmp_buf format
*/
#include <linux/linkage.h>
.text
.align 8
ENTRY(setjmp)
pop %rcx
movq %rcx, (%rdi) /* Return address */
movq %rsp, 8(%rdi)
movq %rbp, 16(%rdi)
movq %rbx, 24(%rdi)
movq %r12, 32(%rdi)
movq %r13, 40(%rdi)
movq %r14, 48(%rdi)
movq %r15, 56(%rdi)
xorq %rax, %rax /* Direct invocation returns 0 */
jmpq *%rcx
ENDPROC(setjmp)
.align 8
ENTRY(longjmp)
movq (%rdi), %rcx /* Return address */
movq 8(%rdi), %rsp
movq 16(%rdi), %rbp
movq 24(%rdi), %rbx
movq 32(%rdi), %r12
movq 40(%rdi), %r13
movq 48(%rdi), %r14
movq 56(%rdi), %r15
movq %rsi, %rax /* Value to be returned by setjmp() */
testq %rax, %rax /* cannot be 0 in this case */
jnz 1f
incq %rax /* Return 1 instead */
1:
jmpq *%rcx
ENDPROC(longjmp)

19
arch/x86/cpu/x86_64/setjmp.c
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@ -1,19 +0,0 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2016 Google, Inc
*/
#include <common.h>
#include <asm/setjmp.h>
int setjmp(struct jmp_buf_data *jmp_buf)
{
printf("WARNING: setjmp() is not supported\n");
return 0;
}
void longjmp(struct jmp_buf_data *jmp_buf, int val)
{
printf("WARNING: longjmp() is not supported\n");
}

17
arch/x86/include/asm/setjmp.h
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@ -8,6 +8,21 @@
#ifndef __setjmp_h
#define __setjmp_h
#ifdef CONFIG_X86_64
struct jmp_buf_data {
unsigned long __rip;
unsigned long __rsp;
unsigned long __rbp;
unsigned long __rbx;
unsigned long __r12;
unsigned long __r13;
unsigned long __r14;
unsigned long __r15;
};
#else
struct jmp_buf_data {
unsigned int __ebx;
unsigned int __esp;
@ -17,6 +32,8 @@ struct jmp_buf_data {
unsigned int __eip;
};
#endif
int setjmp(struct jmp_buf_data *jmp_buf);
void longjmp(struct jmp_buf_data *jmp_buf, int val);