diff options
Diffstat (limited to 'lib/libc/mips/gen/makecontext.c')
| -rw-r--r-- | lib/libc/mips/gen/makecontext.c | 99 |
1 files changed, 68 insertions, 31 deletions
diff --git a/lib/libc/mips/gen/makecontext.c b/lib/libc/mips/gen/makecontext.c index 01d88bf..f2a826e 100644 --- a/lib/libc/mips/gen/makecontext.c +++ b/lib/libc/mips/gen/makecontext.c @@ -1,4 +1,4 @@ -/* $NetBSD: makecontext.c,v 1.3 2003/01/19 08:53:36 matt Exp $ */ +/* $NetBSD: makecontext.c,v 1.5 2009/12/14 01:07:42 matt Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. @@ -15,13 +15,6 @@ * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the NetBSD - * Foundation, Inc. and its contributors. - * 4. Neither the name of The NetBSD Foundation nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED @@ -39,48 +32,92 @@ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #if defined(LIBC_SCCS) && !defined(lint) -__RCSID("$NetBSD: makecontext.c,v 1.3 2003/01/19 08:53:36 matt Exp $"); +__RCSID("$NetBSD: makecontext.c,v 1.5 2009/12/14 01:07:42 matt Exp $"); #endif -#include <sys/types.h> -#include <ucontext.h> +#include <sys/param.h> +#include <machine/regnum.h> + #include <stdarg.h> +#include <stdlib.h> +#include <unistd.h> +#include <stdio.h> +#include <ucontext.h> + +__weak_reference(__makecontext, makecontext); + +void _ctx_done(ucontext_t *); +void _ctx_start(void); void -makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) +__makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) { - /* XXXMIPS: Implement me */ -#if 0 - __greg_t *gr = ucp->uc_mcontext.__gregs; - uintptr_t *sp; + mcontext_t *mc; + register_t *sp; int i; va_list ap; - void __resumecontext(void); + /* + * XXX/juli + * We need an mc_len or mc_flags like other architectures + * so that we can mark a context as invalid. Store it in + * mc->mc_regs[ZERO] perhaps? + */ + if (argc < 0 || argc > 6 || ucp == NULL || + ucp->uc_stack.ss_sp == NULL || + ucp->uc_stack.ss_size < MINSIGSTKSZ) + return; + mc = &ucp->uc_mcontext; - /* LINTED uintptr_t is safe */ - sp = (uintptr_t *) + sp = (register_t *) ((uintptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size); - /* LINTED uintptr_t is safe */ +#if defined(__mips_o32) || defined(__mips_o64) sp -= (argc >= 4 ? argc : 4); /* Make room for >=4 arguments. */ - sp = (uintptr_t *) - ((uintptr_t)sp & ~0x7); /* Align on double-word boundary. */ + sp = (register_t *) + ((uintptr_t)sp & ~0x7); /* Align on double-word boundary. */ +#elif defined(__mips_n32) || defined(__mips_n64) + sp -= (argc > 8 ? argc - 8 : 0); /* Make room for > 8 arguments. */ + sp = (register_t *) + ((uintptr_t)sp & ~0xf); /* Align on quad-word boundary. */ +#endif - gr[_REG_SP] = (__greg_t)sp; - gr[_REG_RA] = (__greg_t)__resumecontext; - gr[_REG_T9] = (__greg_t)func; /* required for .abicalls */ - gr[_REG_EPC] = (__greg_t)func; + mc->mc_regs[SP] = (intptr_t)sp; + mc->mc_regs[S0] = (intptr_t)ucp; + mc->mc_regs[T9] = (intptr_t)func; + mc->mc_pc = (intptr_t)_ctx_start; /* Construct argument list. */ va_start(ap, argc); +#if defined(__mips_o32) || defined(__mips_o64) /* Up to the first four arguments are passed in $a0-3. */ for (i = 0; i < argc && i < 4; i++) - /* LINTED uintptr_t is safe */ - gr[_REG_A0 + i] = va_arg(ap, uintptr_t); + /* LINTED register_t is safe */ + mc->mc_regs[A0 + i] = va_arg(ap, register_t); + /* Pass remaining arguments on the stack above the $a0-3 gap. */ + sp += i; +#endif +#if defined(__mips_n32) || defined(__mips_n64) + /* Up to the first 8 arguments are passed in $a0-7. */ + for (i = 0; i < argc && i < 8; i++) + /* LINTED register_t is safe */ + mc->mc_regs[A0 + i] = va_arg(ap, register_t); /* Pass remaining arguments on the stack above the $a0-3 gap. */ - for (sp += 4; i < argc; i++) +#endif + /* Pass remaining arguments on the stack above the $a0-3 gap. */ + for (; i < argc; i++) /* LINTED uintptr_t is safe */ - *sp++ = va_arg(ap, uintptr_t); + *sp++ = va_arg(ap, register_t); va_end(ap); -#endif +} + +void +_ctx_done(ucontext_t *ucp) +{ + + if (ucp->uc_link == NULL) + exit(0); + else { + setcontext((const ucontext_t *)ucp->uc_link); + abort(); + } } |
