1/* $NetBSD: setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $ */ 2 3/* 4 * Copyright (c) 1997 Mark Brinicombe 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Mark Brinicombe 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <machine/asm.h> 36__FBSDID("$FreeBSD$"); 37/* 38 * C library -- setjmp, longjmp 39 * 40 * longjmp(a,v) 41 * will generate a "return(v)" from the last call to 42 * setjmp(a) 43 * by restoring registers from the stack. 44 * The previous signal state is restored. 45 */ 46 47ENTRY(setjmp) 48 /* Block all signals and retrieve the old signal mask */ 49 stmfd sp!, {r0, r14} 50 add r2, r0, #(25 * 4) /* oset */ 51 mov r0, #0x00000001 /* SIG_BLOCK */ 52 mov r1, #0 /* set */ 53 54 bl PIC_SYM(_C_LABEL(sigprocmask), PLT) 55 56 ldmfd sp!, {r0, r14} 57 58 ldr r1, .Lsetjmp_magic 59 str r1, [r0], #4 60 61#ifdef __SOFTFP__ 62 add r0, r0, #52 63#else 64 /* Store fp registers */ 65 sfm f4, 4, [r0], #48 66 /* Store fpsr */ 67 rfs r1 68 str r1, [r0], #0x0004 69#endif /* __SOFTFP__ */ 70 /* Store integer registers */ 71 stmia r0, {r4-r14} 72 mov r0, #0x00000000 73 RET 74 75.Lsetjmp_magic: 76 .word _JB_MAGIC_SETJMP 77 78 79.weak _C_LABEL(longjmp) 80.set _C_LABEL(longjmp), _C_LABEL(__longjmp) 81ENTRY(__longjmp) 82 ldr r2, .Lsetjmp_magic 83 ldr r3, [r0] 84 teq r2, r3 85 bne botch 86 87 88 /* Set signal mask */ 89 stmfd sp!, {r0, r1, r14} 90 sub sp, sp, #4 /* align the stack */ 91 92 add r1, r0, #(25 * 4) /* Signal mask */ 93 mov r0, #3 /* SIG_SETMASK */ 94 mov r2, #0 95 bl PIC_SYM(_C_LABEL(sigprocmask), PLT) 96 97 add sp, sp, #4 /* unalign the stack */ 98 ldmfd sp!, {r0, r1, r14} 99 100 add r0, r0, #4 101#ifdef __SOFTFP__ 102 add r0, r0, #52 103#else 104 /* Restore fp registers */ 105 lfm f4, 4, [r0], #48 106 /* Restore FPSR */ 107 ldr r4, [r0], #0x0004 108 wfs r4 109#endif /* __SOFTFP__ */ 110 /* Restore integer registers */ 111 ldmia r0, {r4-r14} 112 113 /* Validate sp and r14 */ 114 teq sp, #0 115 teqne r14, #0 116 beq botch 117 118 /* Set return value */ 119 120 mov r0, r1 121 teq r0, #0x00000000 122 moveq r0, #0x00000001 123 RET 124 125 /* validation failed, die die die. */ 126botch: 127 bl PIC_SYM(_C_LABEL(longjmperror), PLT) 128 bl PIC_SYM(_C_LABEL(abort), PLT) 129 b . - 8 /* Cannot get here */ 130