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/* SPDX-License-Identifier: MIT */
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/* Copyright (c) 2021 Winlin */
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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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#if 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 /* The first six integer or pointer arguments are passed in registers RDI, RSI, RDX, RCX, R8, R9. */
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#define JB_R13 3 /* If the callee wishes to use registers RBX, RSP, RBP, and R12–R15, it must restore their original values before returning control to the caller. */
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#define JB_R14 4 /* @see https://en.wikipedia.org/wiki/X86_calling_conventions */
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#define JB_R15 5 /* @see https://www.cnblogs.com/Five100Miles/p/8458561.html */
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#define JB_RSP 6
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#define JB_PC 7
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.file "md_darwin.S"
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.text
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/* _st_md_cxt_save(__jmp_buf env) */ /* The env is rdi, https://en.wikipedia.org/wiki/X86_calling_conventions */
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.globl __st_md_cxt_save
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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) /* Save rbx to env[0], *(int64_t*)(rdi+0)=rbx */
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movq %rbp, (JB_RBP*8)(%rdi) /* Save rbp to env[1], *(int64_t*)(rdi+1)=rbp */
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movq %r12, (JB_R12*8)(%rdi) /* Save r12 to env[2], *(int64_t*)(rdi+2)=r12 */
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movq %r13, (JB_R13*8)(%rdi) /* Save r13 to env[3], *(int64_t*)(rdi+3)=r13 */
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movq %r14, (JB_R14*8)(%rdi) /* Save r14 to env[4], *(int64_t*)(rdi+4)=r14 */
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movq %r15, (JB_R15*8)(%rdi) /* Save r15 to env[5], *(int64_t*)(rdi+5)=r15 */
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/* Save SP */
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leaq 8(%rsp), %r8 /* Save *(int64_t*)(rsp+8) to r8, https://github.com/ossrs/state-threads/issues/11#issuecomment-888709759 */
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movq %r8, (JB_RSP*8)(%rdi) /* Save r8(rsp) to env[6], *(int64_t*)(rdi+6)=r8 */
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/* Save PC we are returning to */
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movq (%rsp), %r9 /* Save PC(parent function address) %(rsp) to r9 */
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movq %r9, (JB_PC*8)(%rdi) /* Save r9(PC) to env[7], *(int64_t*)(rdi+7)=r9 */
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xorq %rax, %rax /* Reset rax to 0 */
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ret
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/****************************************************************/
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/* _st_md_cxt_restore(__jmp_buf env, int val) */ /* The env is rdi, val is esi/rsi, https://en.wikipedia.org/wiki/X86_calling_conventions */
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.globl __st_md_cxt_restore
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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 /* Load rbx from env[0] */
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movq (JB_RBP*8)(%rdi), %rbp /* Load rbp from env[1] */
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movq (JB_R12*8)(%rdi), %r12 /* Load r12 from env[2] */
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movq (JB_R13*8)(%rdi), %r13 /* Load r13 from env[3] */
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movq (JB_R14*8)(%rdi), %r14 /* Load r14 from env[4] */
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movq (JB_R15*8)(%rdi), %r15 /* Load r15 from env[5] */
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/* Set return value */ /* The esi is param1 val, the eax is return value */
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test %esi, %esi /* if (!val) { */
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mov $01, %eax /* val=1; */
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cmove %eax, %esi /* } */
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mov %esi, %eax /* return val; */
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/* Restore PC and RSP */
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movq (JB_PC*8)(%rdi), %r8 /* Load r8(PC) from env[7] */
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movq (JB_RSP*8)(%rdi), %rsp /* Load rsp from env[6] */
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/* Jump to saved PC */
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jmpq *%r8 /* Jump to r8(PC) */
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/****************************************************************/
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#endif
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#endif
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