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Add longjmp support for Thumb-2 

When a Thumb-2 kernel is being used, then longjmp must be implemented
using the Thumb-2 instruction set in module/lua/setjmp/setjmp_arm.S.

Original-patch-by: @jsrlabs
Reviewed-by: @awehrfritz
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #7408 
Closes #9957 
Closes #9967
This commit is contained in:
Brian Behlendorf 2020-04-29 17:30:13 -07:00 committed by GitHub
parent c14ca1456e
commit ab16c87e55
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1 changed files with 18 additions and 1 deletions
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19
module/lua/setjmp/setjmp_arm.S
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@ -31,12 +31,19 @@
#if defined(__arm__) && !defined(__aarch64__)
#if defined(__thumb2__)
#define _FUNC_MODE .code 16; .thumb_func
#else
#define _FUNC_MODE .code 32
#endif
#define ENTRY(x) \
.text; \
.syntax unified; \
.align 2; \
.global x; \
.type x,#function; \
.code 32; \
_FUNC_MODE; \
x:
#define END(x) \
@ -49,13 +56,23 @@ x:
* setjump + longjmp
*/
ENTRY(setjmp)
#if defined(__thumb2__)
mov ip, sp
stmia r0, {r4-r12,r14}
#else
stmia r0, {r4-r14}
#endif
mov r0, #0x00000000
RET
END(setjmp)
ENTRY(longjmp)
#if defined(__thumb2__)
ldmia r0, {r4-r12,r14}
mov sp, ip
#else
ldmia r0, {r4-r14}
#endif
mov r0, #0x00000001
RET
END(longjmp)