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nicolasnoblenicolasnoble
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Adding ucontext.
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‎src/mips/common/psxlibc/ucontext.h

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/*
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MIT License
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Copyright (c) 2025 PCSX-Redux authors
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#pragma once
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// This file provides an ersatz for the ucontext.h API, which is otherwise not available on PSX.
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// It defines the necessary structures and function prototypes to allow for context switching,
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// similar to what ucontext.h provides in POSIX systems. It's not strictly compliant with the POSIX standard,
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// but it provides a minimal implementation suitable for coroutine management in a PSX environment.
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#include <stdint.h>
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struct stack_t {
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void *ss_sp;
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unsigned ss_size;
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};
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struct mcontext_t {
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uint32_t reserved[16];
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};
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struct ucontext_t {
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struct mcontext_t uc_mcontext;
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struct ucontext_t *uc_link;
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struct stack_t uc_stack;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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int getcontext(struct ucontext_t *ucp);
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int setcontext(const struct ucontext_t *ucp);
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int makecontext(struct ucontext_t *ucp, void (*func)(void *), void *arg);
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int swapcontext(struct ucontext_t *oucp, const struct ucontext_t *ucp);
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#ifdef __cplusplus
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}
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#endif

‎src/mips/common/psxlibc/ucontext.s

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/*
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MIT License
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Copyright (c) 2025 PCSX-Redux authors
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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.set RAPTR, 0
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.set SPPTR, 4
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.set S8PTR, 8
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.set S0PTR, 12
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.set S1PTR, 16
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.set S2PTR, 20
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.set S3PTR, 24
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.set S4PTR, 28
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.set S5PTR, 32
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.set S6PTR, 36
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.set S7PTR, 40
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.set GPPTR, 44
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.set FUNCPTR, 48
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.set ARGPTR, 52
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.set UNUSED1, 56
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.set UNUSED2, 60
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.set LINKPTR, 64
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.set STACKPTR, 68
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.set STACKSIZE, 72
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.section .text.getcontext, "ax", @progbits
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.align 2
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.global getcontext
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.type getcontext, @function
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getcontext:
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sw $ra, RAPTR($a0)
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sw $sp, SPPTR($a0)
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sw $s8, S8PTR($a0)
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sw $s0, S0PTR($a0)
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sw $s1, S1PTR($a0)
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sw $s2, S2PTR($a0)
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sw $s3, S3PTR($a0)
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sw $s4, S4PTR($a0)
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sw $s5, S5PTR($a0)
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sw $s6, S6PTR($a0)
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sw $s7, S7PTR($a0)
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sw $gp, GPPTR($a0)
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move $v0, $0
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jr $ra
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.section .text.setcontext, "ax", @progbits
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.align 2
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.global setcontext
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.type setcontext, @function
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setcontext:
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lw $ra, RAPTR($a0)
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lw $sp, SPPTR($a0)
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lw $s8, S8PTR($a0)
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lw $s0, S0PTR($a0)
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lw $s1, S1PTR($a0)
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lw $s2, S2PTR($a0)
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lw $s3, S3PTR($a0)
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lw $s4, S4PTR($a0)
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lw $s5, S5PTR($a0)
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lw $s6, S6PTR($a0)
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lw $s7, S7PTR($a0)
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lw $gp, GPPTR($a0)
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move $v0, $0
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jr $ra
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.section .text.makecontext, "ax", @progbits
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.align 2
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.global makecontext
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.type makecontext, @function
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.type contexttrampoline, @function
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contexttrampoline:
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lw $a0, ARGPTR($s0)
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lw $a1, FUNCPTR($s0)
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lw $sp, SPPTR($s0)
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lw $s8, S8PTR($s0)
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lw $gp, GPPTR($s0)
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jalr $a1
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lw $a0, LINKPTR($s0)
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j setcontext
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makecontext:
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lw $v1, STACKPTR($a0)
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lw $t0, STACKSIZE($a0)
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la $v0, contexttrampoline
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sw $v0, RAPTR($a0)
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sw $a1, FUNCPTR($a0)
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sw $a2, ARGPTR($a0)
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sw $a0, S0PTR($a0)
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addu $v1, $t0
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sw $v1, SPPTR($a0)
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jr $ra
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.section .text.swapcontext, "ax", @progbits
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.align 2
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.global swapcontext
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.type swapcontext, @function
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swapcontext:
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sw $ra, RAPTR($a0)
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sw $sp, SPPTR($a0)
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sw $s8, S8PTR($a0)
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sw $s0, S0PTR($a0)
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sw $s1, S1PTR($a0)
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sw $s2, S2PTR($a0)
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sw $s3, S3PTR($a0)
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sw $s4, S4PTR($a0)
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sw $s5, S5PTR($a0)
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sw $s6, S6PTR($a0)
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sw $s7, S7PTR($a0)
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sw $gp, GPPTR($a0)
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lw $ra, RAPTR($a1)
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lw $sp, SPPTR($a1)
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lw $s8, S8PTR($a1)
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lw $s0, S0PTR($a1)
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lw $s1, S1PTR($a1)
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lw $s2, S2PTR($a1)
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lw $s3, S3PTR($a1)
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lw $s4, S4PTR($a1)
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lw $s5, S5PTR($a1)
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lw $s6, S6PTR($a1)
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lw $s7, S7PTR($a1)
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lw $gp, GPPTR($a1)
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move $v0, $0
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jr $ra

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