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Diffstat (limited to 'lib/libc/arm/gen/_setjmp.S')
| -rw-r--r-- | lib/libc/arm/gen/_setjmp.S | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/lib/libc/arm/gen/_setjmp.S b/lib/libc/arm/gen/_setjmp.S new file mode 100644 index 000000000000..9e655d2e9e2e --- /dev/null +++ b/lib/libc/arm/gen/_setjmp.S @@ -0,0 +1,135 @@ +/* $NetBSD: _setjmp.S,v 1.12 2013/04/19 13:45:45 matt Exp $ */ + +/* + * Copyright (c) 1997 Mark Brinicombe + * All rights reserved. + * + * 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 Mark Brinicombe + * 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 AUTHOR 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 AUTHOR 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. + */ + +#if !defined(__SOFTFP__) && !defined(__VFP_FP__) && !defined(__ARM_PCS) +#error FPA is not supported anymore +#endif + +#if !defined(_STANDALONE) + .fpu vfp +#endif + +#include <machine/asm.h> +#include <machine/setjmp.h> +/* + * 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. + * The previous signal state is NOT restored. + * + * Note: r0 is the return value + * r1-r3,ip are scratch registers in functions + */ + +ENTRY(_setjmp) + ldr r1, .L_setjmp_magic + +#if !defined(_STANDALONE) && !defined(SOFTFLOAT_FOR_GCC) + add r2, r0, #(_JB_REG_D8 * 4) + vstmia r2, {d8-d15} + vmrs r2, fpscr + str r2, [r0, #(_JB_REG_FPSCR * 4)] +#endif /* !_STANDALONE && !SOFTFLOAT_FOR_GCC */ + + str r1, [r0] + + add r0, r0, #(_JB_REG_R4 * 4) + /* Store integer registers */ +#ifndef __thumb__ + stmia r0, {r4-r14} +#else + stmia r0, {r4-r12} + str r13, [r0, #((_JB_REG_R13 - _JB_REG_R4) * 4)] + str r14, [r0, #((_JB_REG_R14 - _JB_REG_R4) * 4)] +#endif + + mov r0, #0x00000000 + RET +END(_setjmp) + +.L_setjmp_magic: + .word _JB_MAGIC__SETJMP + +WEAK_ALIAS(___longjmp, _longjmp) +ENTRY(_longjmp) + ldr r2, [r0] /* get magic from jmp_buf */ + ldr ip, .L_setjmp_magic /* load magic */ + teq ip, r2 /* magic correct? */ + bne botch /* no, botch */ + +#if !defined(_STANDALONE) && !defined(SOFTFLOAT_FOR_GCC) + add ip, r0, #(_JB_REG_D8 * 4) + vldmia ip, {d8-d15} + ldr ip, [r0, #(_JB_REG_FPSCR * 4)] + vmsr fpscr, ip +#endif /* !_STANDALONE && !SOFTFLOAT_FOR_GCC */ + + add r0, r0, #(_JB_REG_R4 * 4) + /* Restore integer registers */ +#ifndef __thumb__ + ldmia r0, {r4-r14} +#else + ldmia r0, {r4-r12} + ldr r13, [r0, #((_JB_REG_R13 - _JB_REG_R4) * 4)] + ldr r14, [r0, #((_JB_REG_R14 - _JB_REG_R4) * 4)] +#endif + + /* Validate sp and r14 */ + teq sp, #0 + it ne + teqne r14, #0 + it eq + beq botch + + /* Set return value */ + movs r0, r1 + it eq + moveq r0, #0x00000001 + RET + + /* validation failed, die die die. */ +botch: +#if !defined(_STANDALONE) + bl PIC_SYM(_C_LABEL(longjmperror), PLT) + bl PIC_SYM(_C_LABEL(abort), PLT) +1: b 1b /* Cannot get here */ +#else + b . +#endif +END(_longjmp) + + .section .note.GNU-stack,"",%progbits |