mirror of https://github.com/0intro/libtask
91 lines
1.9 KiB
C
91 lines
1.9 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__) && 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(__APPLE__) && !defined(__i386__)
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#define NEEDPOWERMAKECONTEXT
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#define NEEDSWAPCONTEXT
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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
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makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
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{
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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
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makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
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{
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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 NEEDARMMAKECONTEXT
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void
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makecontext(ucontext_t *uc, void (*fn)(void), int argc, ...)
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{
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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
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swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
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{
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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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