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05c1361283
Add a very simple setjmp/longjmp implementation. No destructors or other cleanup is handled.
77 lines
1.5 KiB
ArmAsm
77 lines
1.5 KiB
ArmAsm
; This file is part of the C standard library for the jsix operating
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; system.
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;
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; This Source Code Form is subject to the terms of the Mozilla Public
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; License, v. 2.0. If a copy of the MPL was not distributed with this
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; file, You can obtain one at https://mozilla.org/MPL/2.0/.
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struc JMPBUF
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.rbx: resq 1
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.rsp: resq 1
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.rbp: resq 1
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.r12: resq 1
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.r13: resq 1
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.r14: resq 1
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.r15: resq 1
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.retaddr: resq 1
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.mxcsr: resd 1
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.fcw: resw 1
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endstruc
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global setjmp: function (setjmp.end - setjmp)
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setjmp:
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push rbp
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mov rbp, rsp
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mov rax, [rsp + 8]
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mov [rdi + JMPBUF.retaddr], rax
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mov [rdi + JMPBUF.rbx], rbx
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mov [rdi + JMPBUF.rsp], rsp
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mov [rdi + JMPBUF.rbp], rbp
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mov [rdi + JMPBUF.r12], r12
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mov [rdi + JMPBUF.r13], r13
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mov [rdi + JMPBUF.r14], r14
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mov [rdi + JMPBUF.r15], r15
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stmxcsr [rdi + JMPBUF.mxcsr]
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fnstcw [rdi + JMPBUF.fcw]
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mov rax, 0 ; actual setjmp returns 0
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pop rbp
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ret
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.end:
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global longjmp: function (longjmp.end - longjmp)
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longjmp:
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push rbp
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mov rbp, rsp
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mov rbx, [rdi + JMPBUF.rbx]
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mov rbp, [rdi + JMPBUF.rbp]
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mov r12, [rdi + JMPBUF.r12]
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mov r13, [rdi + JMPBUF.r13]
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mov r14, [rdi + JMPBUF.r14]
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mov r15, [rdi + JMPBUF.r15]
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ldmxcsr [rdi + JMPBUF.mxcsr]
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fnclex
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fldcw [rdi + JMPBUF.fcw]
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mov rsp, [rdi + JMPBUF.rsp]
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mov rax, rsi
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cmp rax, 0
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jne .done
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mov rax, 1
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.done:
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pop rbp
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ret
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.end:
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