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https://github.com/ossrs/srs.git
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168 lines
4 KiB
ArmAsm
168 lines
4 KiB
ArmAsm
/* SPDX-License-Identifier: MPL-1.1 OR GPL-2.0-or-later */
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/* If user disable the ASM, such as avoiding bugs in ASM, donot compile it. */
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#if !defined(MD_ST_NO_ASM)
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/*
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* Portions created by SGI are Copyright (C) 2000 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#if defined(__i386__)
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/****************************************************************/
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/*
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* Internal __jmp_buf layout
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*/
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#define JB_BX 0
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#define JB_SI 1
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#define JB_DI 2
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#define JB_BP 3
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#define JB_SP 4
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#define JB_PC 5
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.file "md.S"
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.text
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/* _st_md_cxt_save(__jmp_buf env) */
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.globl _st_md_cxt_save
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.type _st_md_cxt_save, @function
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.align 16
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_st_md_cxt_save:
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movl 4(%esp), %eax
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/*
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* Save registers.
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*/
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movl %ebx, (JB_BX*4)(%eax)
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movl %esi, (JB_SI*4)(%eax)
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movl %edi, (JB_DI*4)(%eax)
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/* Save SP */
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leal 4(%esp), %ecx
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movl %ecx, (JB_SP*4)(%eax)
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/* Save PC we are returning to */
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movl 0(%esp), %ecx
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movl %ecx, (JB_PC*4)(%eax)
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/* Save caller frame pointer */
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movl %ebp, (JB_BP*4)(%eax)
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xorl %eax, %eax
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ret
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.size _st_md_cxt_save, .-_st_md_cxt_save
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/****************************************************************/
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/* _st_md_cxt_restore(__jmp_buf env, int val) */
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.globl _st_md_cxt_restore
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.type _st_md_cxt_restore, @function
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.align 16
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_st_md_cxt_restore:
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/* First argument is jmp_buf */
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movl 4(%esp), %ecx
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/* Second argument is return value */
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movl 8(%esp), %eax
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/* Set the return address */
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movl (JB_PC*4)(%ecx), %edx
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/*
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* Restore registers.
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*/
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movl (JB_BX*4)(%ecx), %ebx
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movl (JB_SI*4)(%ecx), %esi
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movl (JB_DI*4)(%ecx), %edi
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movl (JB_BP*4)(%ecx), %ebp
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movl (JB_SP*4)(%ecx), %esp
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testl %eax, %eax
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jnz 1f
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incl %eax
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/* Jump to saved PC */
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1: jmp *%edx
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.size _st_md_cxt_restore, .-_st_md_cxt_restore
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/****************************************************************/
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#elif defined(__amd64__) || defined(__x86_64__)
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/****************************************************************/
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/*
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* Internal __jmp_buf layout
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*/
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#define JB_RBX 0
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#define JB_RBP 1
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#define JB_R12 2
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#define JB_R13 3
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#define JB_R14 4
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#define JB_R15 5
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#define JB_RSP 6
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#define JB_PC 7
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.file "md.S"
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.text
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/* _st_md_cxt_save(__jmp_buf env) */
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.globl _st_md_cxt_save
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.type _st_md_cxt_save, @function
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.align 16
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_st_md_cxt_save:
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/*
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* Save registers.
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*/
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movq %rbx, (JB_RBX*8)(%rdi)
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movq %rbp, (JB_RBP*8)(%rdi)
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movq %r12, (JB_R12*8)(%rdi)
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movq %r13, (JB_R13*8)(%rdi)
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movq %r14, (JB_R14*8)(%rdi)
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movq %r15, (JB_R15*8)(%rdi)
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/* Save SP */
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leaq 8(%rsp), %rdx
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movq %rdx, (JB_RSP*8)(%rdi)
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/* Save PC we are returning to */
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movq (%rsp), %rax
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movq %rax, (JB_PC*8)(%rdi)
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xorq %rax, %rax
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ret
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.size _st_md_cxt_save, .-_st_md_cxt_save
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/****************************************************************/
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/* _st_md_cxt_restore(__jmp_buf env, int val) */
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.globl _st_md_cxt_restore
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.type _st_md_cxt_restore, @function
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.align 16
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_st_md_cxt_restore:
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/*
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* Restore registers.
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*/
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movq (JB_RBX*8)(%rdi), %rbx
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movq (JB_RBP*8)(%rdi), %rbp
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movq (JB_R12*8)(%rdi), %r12
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movq (JB_R13*8)(%rdi), %r13
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movq (JB_R14*8)(%rdi), %r14
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movq (JB_R15*8)(%rdi), %r15
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/* Set return value */
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test %esi, %esi
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mov $01, %eax
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cmove %eax, %esi
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mov %esi, %eax
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movq (JB_PC*8)(%rdi), %rdx
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movq (JB_RSP*8)(%rdi), %rsp
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/* Jump to saved PC */
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jmpq *%rdx
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.size _st_md_cxt_restore, .-_st_md_cxt_restore
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/****************************************************************/
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#endif
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#endif
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