diff options
Diffstat (limited to 'lib/libc/mips/gen/setjmp.S')
| -rw-r--r-- | lib/libc/mips/gen/setjmp.S | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/lib/libc/mips/gen/setjmp.S b/lib/libc/mips/gen/setjmp.S new file mode 100644 index 0000000..0abfed8 --- /dev/null +++ b/lib/libc/mips/gen/setjmp.S @@ -0,0 +1,128 @@ +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Ralph Campbell. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 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 University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University 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 REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/syscall.h> +#include <machine/asm.h> +#include <machine/regnum.h> + +#if defined(LIBC_SCCS) + .text + .asciz "$OpenBSD: setjmp.S,v 1.6 1997/07/23 20:55:25 kstailey Exp $" +#endif /* LIBC_SCCS */ + +/* + * C library -- setjmp, longjmp + * + * longjmp(a,v) + * will generate a "return(v)" from + * the last call to + * setjmp(a) + * by restoring registers from the stack, + * and a struct sigcontext, see <signal.h> + */ + +#define SETJMP_FRAME_SIZE (STAND_FRAME_SIZE + 12) + +NON_LEAF(setjmp, SETJMP_FRAME_SIZE, ra) + .mask 0x80000000, (STAND_RA_OFFSET - STAND_FRAME_SIZE) + subu sp, sp, SETJMP_FRAME_SIZE # allocate stack frame +#ifdef ABICALLS + .cprestore 16 +#endif + .set reorder + sw ra, STAND_RA_OFFSET(sp) # save state + sw a0, SETJMP_FRAME_SIZE(sp) + move a0, zero # get current signal mask + jal _C_LABEL(sigblock) + lw v1, SETJMP_FRAME_SIZE(sp) # v1 = jmpbuf + sw v0, (1 * 4)(v1) # save sc_mask = sigblock(0) + move a0, zero + addu a1, sp, STAND_FRAME_SIZE # pointer to struct sigaltstack + jal _C_LABEL(sigaltstack) + lw a0, SETJMP_FRAME_SIZE(sp) # restore jmpbuf + lw v1, STAND_FRAME_SIZE+8(sp) # get old ss_onstack + and v1, v1, 1 # extract onstack flag + sw v1, 0(a0) # save it in sc_onstack + lw ra, STAND_RA_OFFSET(sp) + addu sp, sp, SETJMP_FRAME_SIZE + blt v0, zero, botch # check for sigstack() error + sw ra, (2 * 4)(a0) # sc_pc = return address + li v0, 0xACEDBADE # sigcontext magic number + sw v0, ((ZERO + 3) * 4)(a0) # saved in sc_regs[0] + sw s0, ((S0 + 3) * 4)(a0) + sw s1, ((S1 + 3) * 4)(a0) + sw s2, ((S2 + 3) * 4)(a0) + sw s3, ((S3 + 3) * 4)(a0) + sw s4, ((S4 + 3) * 4)(a0) + sw s5, ((S5 + 3) * 4)(a0) + sw s6, ((S6 + 3) * 4)(a0) + sw s7, ((S7 + 3) * 4)(a0) + sw gp, ((GP + 3) * 4)(a0) + sw sp, ((SP + 3) * 4)(a0) + sw s8, ((S8 + 3) * 4)(a0) + li v0, 1 # be nice if we could tell + sw v0, (37 * 4)(a0) # sc_fpused = 1 + cfc1 v0, $31 + swc1 $f20, ((20 + 38) * 4)(a0) + swc1 $f21, ((21 + 38) * 4)(a0) + swc1 $f22, ((22 + 38) * 4)(a0) + swc1 $f23, ((23 + 38) * 4)(a0) + swc1 $f24, ((24 + 38) * 4)(a0) + swc1 $f25, ((25 + 38) * 4)(a0) + swc1 $f26, ((26 + 38) * 4)(a0) + swc1 $f27, ((27 + 38) * 4)(a0) + swc1 $f28, ((28 + 38) * 4)(a0) + swc1 $f29, ((29 + 38) * 4)(a0) + swc1 $f30, ((30 + 38) * 4)(a0) + swc1 $f31, ((31 + 38) * 4)(a0) + sw v0, ((32 + 38) * 4)(a0) + move v0, zero + j ra +END(setjmp) + +LEAF(longjmp) +#ifdef ABICALLS + subu sp, sp, 32 + .cprestore 16 +#endif + .set reorder + sw a1, ((V0 + 3) * 4)(a0) # save return value in sc_regs[V0] + li v0, SYS_sigreturn + syscall +botch: + jal _C_LABEL(longjmperror) + jal _C_LABEL(abort) +END(longjmp) |
