minix/lib/libc/arch/arm/gen/setjmp.S
Ben Gras 57bab02d57 kernel, libc: signals fixes
. kernel: signal handler args for ARM
	. kernel: sanity check return address (LSB indicates thumb mode)
	. libc: properly retrieve signal mask for ARM

together fix test37 on ARM.

Change-Id: I4e00f754c50104ed85c7fdf8ec5ad54568f20a81
2013-02-04 12:03:46 +01:00

129 lines
3.6 KiB
ArmAsm

/* $NetBSD: setjmp.S,v 1.9 2012/08/01 06:02:13 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.
*/
#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 restored.
*/
ENTRY(__setjmp14)
/* Get the signal mask. */
stmfd sp!, {r0-r2, r14}
add r2, r0, #(_JB_SIGMASK * 4)
mov r1, #0x00000000
mov r0, #0x00000000
bl PIC_SYM(_C_LABEL(__sigprocmask14), PLT)
ldmfd sp!, {r0-r2, r14}
ldr r1, .Lsetjmp_magic
str r1, [r0], #4
#ifdef SOFTFLOAT
add r0, r0, #52
#elif defined(__VFP_FP__)
#error __setjmp14 VFP support missing
#else
/* Store fp registers */
sfm f4, 4, [r0], #48
/* Store fpsr */
rfs r1
str r1, [r0], #0x0004
#endif /*SOFTFLOAT*/
/* Store integer registers */
stmia r0, {r4-r14}
mov r0, #0x00000000
RET
.Lsetjmp_magic:
.word _JB_MAGIC_SETJMP
ENTRY(__longjmp14)
ldr r2, .Lsetjmp_magic
ldr r3, [r0]
teq r2, r3
bne .Lbotch
/* Restore the signal mask. */
stmfd sp!, {r0-r2, r14}
mov r2, #0x00000000
add r1, r0, #(_JB_SIGMASK * 4)
#ifdef __minix
mov r0, #2 /* SIG_SETMASK */
#else
mov r0, #3 /* SIG_SETMASK */
#endif
bl PIC_SYM(_C_LABEL(__sigprocmask14), PLT)
ldmfd sp!, {r0-r2, r14}
add r0, r0, #4
#ifdef SOFTFLOAT
add r0, r0, #52
#elif defined(__VFP_FP__)
#error __longjmp14 VFP support missing
#else
/* Restore fp registers */
lfm f4, 4, [r0], #48
/* Restore FPSR */
ldr r4, [r0], #0x0004
wfs r4
#endif /* SOFTFLOAT */
/* Restore integer registers */
ldmia r0, {r4-r14}
/* Validate sp and r14 */
teq sp, #0
teqne r14, #0
beq .Lbotch
/* Set return value */
mov r0, r1
teq r0, #0x00000000
moveq r0, #0x00000001
RET
/* validation failed, die die die. */
.Lbotch:
bl PIC_SYM(_C_LABEL(longjmperror), PLT)
bl PIC_SYM(_C_LABEL(abort), PLT)
b . - 8 /* Cannot get here */