1/* $NetBSD: setjmp.S,v 1.14 2013/04/19 13:45:45 matt 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

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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#if !defined(__SOFTFP__) && !defined(__VFP_FP__) && !defined(__ARM_PCS)
36#error FPA is not supported anymore
37#endif
38
39#include <machine/asm.h>
40#include <machine/setjmp.h>
41
42__FBSDID("$FreeBSD: head/lib/libc/arm/gen/setjmp.S 251405 2013-06-05 07:37:45Z andrew $");
43
44/*
45 * C library -- setjmp, longjmp
46 *
47 * longjmp(a,v)
48 * will generate a "return(v)" from the last call to
49 * setjmp(a)
50 * by restoring registers from the stack.

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56 stmfd sp!, {r0, r14}
57 add r2, r0, #(_JB_SIGMASK * 4) /* oset */
58 mov r1, #0x00000000 /* set */
59 mov r0, #0x00000001 /* SIG_BLOCK */
60 bl PIC_SYM(_C_LABEL(sigprocmask), PLT)
61 ldmfd sp!, {r0, r14}
62
63 ldr r1, .Lsetjmp_magic
64 str r1, [r0] /* store magic */
65
66 /* Store integer registers */
67 add r0, r0, #(_JB_REG_R4 * 4)
68 stmia r0, {r4-r14}
69 mov r0, #0x00000000
70 RET
71
72.Lsetjmp_magic:
73 .word _JB_MAGIC_SETJMP
74
75
76.weak _C_LABEL(longjmp)
77.set _C_LABEL(longjmp), _C_LABEL(__longjmp)
78ENTRY(__longjmp)
79 ldr r2, [r0]
80 ldr ip, .Lsetjmp_magic
81 teq r2, ip
82 bne .Lbotch
83
84 /* Restore the signal mask. */
85 stmfd sp!, {r0-r2, r14}
86 mov r2, #0x00000000
87 add r1, r0, #(_JB_SIGMASK * 4) /* Signal mask */
88 mov r0, #3 /* SIG_SETMASK */
89 bl PIC_SYM(_C_LABEL(sigprocmask), PLT)
90 ldmfd sp!, {r0-r2, r14}
91
92 add r0, r0, #(_JB_REG_R4 * 4)
93 /* Restore integer registers */
94 ldmia r0, {r4-r14}
95
96 /* Validate sp and r14 */
97 teq sp, #0
98 teqne r14, #0
99 beq .Lbotch
100
101 /* Set return value */
102 movs r0, r1
103 moveq r0, #0x00000001
104 RET
105
106 /* validation failed, die die die. */
107.Lbotch:
108 bl PIC_SYM(_C_LABEL(longjmperror), PLT)
109 bl PIC_SYM(_C_LABEL(abort), PLT)
110 b . - 8 /* Cannot get here */