106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/* Copyright (c) 2005-2006 Russ Cox, MIT; see COPYRIGHT */
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#include "taskimpl.h"
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#if defined(__APPLE__)
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#if defined(__i386__)
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#define NEEDX86MAKECONTEXT
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#define NEEDSWAPCONTEXT
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#elif defined(__x86_64__)
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#define NEEDAMD64MAKECONTEXT
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#define NEEDSWAPCONTEXT
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#else
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#define NEEDPOWERMAKECONTEXT
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#define NEEDSWAPCONTEXT
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#endif
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#endif
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#if defined(__FreeBSD__) && defined(__i386__) && __FreeBSD__ < 5
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#define NEEDX86MAKECONTEXT
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#define NEEDSWAPCONTEXT
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#endif
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#if defined(__OpenBSD__) && defined(__i386__)
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#define NEEDX86MAKECONTEXT
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#define NEEDSWAPCONTEXT
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#endif
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#if defined(__linux__) && defined(__arm__)
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#define NEEDSWAPCONTEXT
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#define NEEDARMMAKECONTEXT
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#endif
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#ifdef NEEDPOWERMAKECONTEXT
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void makecontext(ucontext_t* ucp, void (*func)(void), int argc, ...) {
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ulong *sp, *tos;
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va_list arg;
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tos = (ulong*)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size / sizeof(ulong);
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sp = tos - 16;
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ucp->mc.pc = (long)func;
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ucp->mc.sp = (long)sp;
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va_start(arg, argc);
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ucp->mc.r3 = va_arg(arg, long);
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va_end(arg);
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}
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#endif
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#ifdef NEEDX86MAKECONTEXT
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void makecontext(ucontext_t* ucp, void (*func)(void), int argc, ...) {
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int* sp;
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sp = (int*)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size / 4;
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sp -= argc;
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sp = (void*)((uintptr_t)sp - (uintptr_t)sp % 16); /* 16-align for OS X */
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memmove(sp, &argc + 1, argc * sizeof(int));
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*--sp = 0; /* return address */
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ucp->uc_mcontext.mc_eip = (long)func;
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ucp->uc_mcontext.mc_esp = (int)sp;
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}
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#endif
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#ifdef NEEDAMD64MAKECONTEXT
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void makecontext(ucontext_t* ucp, void (*func)(void), int argc, ...) {
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long* sp;
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va_list va;
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memset(&ucp->uc_mcontext, 0, sizeof ucp->uc_mcontext);
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if (argc != 2)
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__builtin_trap();
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va_start(va, argc);
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ucp->uc_mcontext.mc_rdi = va_arg(va, int);
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ucp->uc_mcontext.mc_rsi = va_arg(va, int);
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va_end(va);
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sp = (long*)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size / sizeof(long);
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sp -= argc;
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sp = (void*)((uintptr_t)sp - (uintptr_t)sp % 16); /* 16-align for OS X */
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*--sp = 0; /* return address */
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ucp->uc_mcontext.mc_rip = (long)func;
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ucp->uc_mcontext.mc_rsp = (long)sp;
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}
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#endif
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#ifdef NEEDARMMAKECONTEXT
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void makecontext(ucontext_t* uc, void (*fn)(void), int argc, ...) {
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int i, *sp;
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va_list arg;
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sp = (int*)uc->uc_stack.ss_sp + uc->uc_stack.ss_size / 4;
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va_start(arg, argc);
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for (i = 0; i < 4 && i < argc; i++)
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uc->uc_mcontext.gregs[i] = va_arg(arg, uint);
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va_end(arg);
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uc->uc_mcontext.gregs[13] = (uint)sp;
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uc->uc_mcontext.gregs[14] = (uint)fn;
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}
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#endif
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#ifdef NEEDSWAPCONTEXT
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int swapcontext(ucontext_t* oucp, const ucontext_t* ucp) {
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if (getcontext(oucp) == 0)
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setcontext(ucp);
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return 0;
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}
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#endif
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