Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

add ARM buildin setjmp/longjmp support #3

Merged
merged 2 commits into from
Sep 3, 2016
Merged

add ARM buildin setjmp/longjmp support #3

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
2af20a7
add ARMv7 support
Sep 3, 2016
f627803
add ARM buildin setjmp/longjmp support
Sep 3, 2016
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
34 changes: 34 additions & 0 deletions md.S
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -462,6 +462,40 @@
#elif defined(__arm__)

/* TODO: FIXME: implement setjmp and longjmp for ARM */
.globl _st_md_cxt_save
.type _st_md_cxt_save, %function
.align 2
_st_md_cxt_save:
mov ip, r0 // r0 is the param jmpbuf ptr address.
// Save registers like
// *ip++ = v1
// *ip++ = ...
// *ip++ = v6
// *ip++ = sl
// *ip++ = fp
stmia ip!, {v1-v6, sl, fp} // TODO: compatible with other ARM version.
movs r2, sp
stmia ip!, {r2, lr}
mov r0, #0 // r0 save the return value(0) of setjmp.
bx lr // return
.size _st_md_cxt_save, .-_st_md_cxt_save

.globl _st_md_cxt_restore
.type _st_md_cxt_restore, %function
.align 2
_st_md_cxt_restore:
mov ip, r0 // r0 -> jmp_buf
movs r0, r1 // r1 -> return value
// The bellow is a group, that is:
// if (r0 == 0) r0 =1;
ITT eq
moveq r0, #1 // long_jmp should never return 0

ldmia ip!, {v1-v6, sl, fp} // restore registers.
ldr sp, [ip], #4 // restore sp, like: sp=*ip; ip+=4;
ldr lr, [ip], #4
bx lr
.size _st_md_cxt_restore, .-_st_md_cxt_restore

#endif

12 changes: 6 additions & 6 deletions md.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -421,12 +421,12 @@
#elif defined(__arm__)
#define MD_STACK_GROWS_DOWN

#if defined(__GLIBC__) && __GLIBC__ >= 2
/* Merge from https://github.com/michaeltalyansky/state-threads/commit/56554a5c425aee8e7a73782eae23d74d83c4120a */
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[8]
#else
#error "ARM/Linux pre-glibc2 not supported yet"
#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
#define MD_USE_BUILTIN_SETJMP

#ifndef JB_RSP
#define JB_RSP 8 // JB_RSP must be same as the index we save in jmpbuf
#endif
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[JB_RSP]

#elif defined(__s390__)
#define MD_STACK_GROWS_DOWN
Expand Down