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dde_linux: save and restore ARM FPU state in setjmp.S

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Fixes #4161
This commit is contained in:
Christian Prochaska 2021-05-27 05:12:58 +02:00 committed by Christian Helmuth
parent 4383579db6
commit f2ff1a6d52
1 changed files with 31 additions and 29 deletions
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60
repos/dde_linux/src/lx_kit/spec/arm/setjmp.S
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@ -38,8 +38,10 @@
#define WEAK_ALIAS(x,y)
#define RET mov pc, lr
#define _JB_MAGIC__SETJMP 0x4278f500
#define _JB_REG_FPSCR 13
#define _JB_REG_R4 14
#define _JB_REG_D8 32
#define __SOFTFP__ 1
#define _STANDALONE
/* end of <machine/asm.h> */
@ -60,20 +62,21 @@ __FBSDID("$FreeBSD: release/8.2.0/lib/libc/arm/gen/_setjmp.S 193145 2009-05-31 0
ENTRY(_setjmp)
ldr r1, .L_setjmp_magic
str r1, [r0], #4
#ifdef __SOFTFP__
add r0, r0, #52
#else
/* Store fp registers */
sfm f4, 4, [r0], #48
/* Store fpsr */
rfs r1
str r1, [r0], #0x0004
#endif /* __SOFTFP__ */
/* Store integer registers */
stmia r0, {r4-r14}
mov r0, #0x00000000
#if __ARM_ARCH >= 6
add r2, r0, #(_JB_REG_D8 * 4)
vstmia r2, {d8-d15}
vmrs r2, fpscr
str r2, [r0, #(_JB_REG_FPSCR * 4)]
#endif
str r1, [r0]
add r0, r0, #(_JB_REG_R4 * 4)
/* Store integer registers */
stmia r0, {r4-r14}
mov r0, #0x00000000
RET
.L_setjmp_magic:
@ -81,22 +84,21 @@ ENTRY(_setjmp)
WEAK_ALIAS(___longjmp, _longjmp)
ENTRY(_longjmp)
ldr r2, .L_setjmp_magic
ldr r3, [r0], #4
teq r2, r3
bne botch
ldr r2, [r0] /* get magic from jmp_buf */
ldr ip, .L_setjmp_magic /* load magic */
teq ip, r2 /* magic correct? */
bne botch /* no, botch */
#ifdef __SOFTFP__
add r0, r0, #52
#else
/* Restore fp registers */
lfm f4, 4, [r0], #48
/* Restore fpsr */
ldr r4, [r0], #0x0004
wfs r4
#endif /* __SOFTFP__ */
/* Restore integer registers */
ldmia r0, {r4-r14}
#if __ARM_ARCH >= 6
add ip, r0, #(_JB_REG_D8 * 4)
vldmia ip, {d8-d15}
ldr ip, [r0, #(_JB_REG_FPSCR * 4)]
vmsr fpscr, ip
#endif
add r0, r0, #(_JB_REG_R4 * 4)
/* Restore integer registers */
ldmia r0, {r4-r14}
/* Validate sp and r14 */
teq sp, #0