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aarch64: fix unwinding in longjmp 

Previously, longjmp() on aarch64 was using CFI directives around the
call to __libc_arm_za_disable() after CFA was redefined at the start
of longjmp(). This may result in unwinding issues. Move the call and
surrounding CFI directives to the beginning of longjmp().

Suggested-by: Wilco Dijkstra <wilco.dijkstra@arm.com>
This commit is contained in:
Yury Khrustalev 2025-05-08 13:53:38 +01:00
parent 2d9f479f37
commit 691edbdf77
1 changed files with 23 additions and 22 deletions
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45
sysdeps/aarch64/__longjmp.S
View File

@ -24,28 +24,6 @@
/* __longjmp(jmpbuf, val) */
ENTRY (__longjmp)
cfi_def_cfa(x0, 0)
cfi_offset(x19, JB_X19<<3)
cfi_offset(x20, JB_X20<<3)
cfi_offset(x21, JB_X21<<3)
cfi_offset(x22, JB_X22<<3)
cfi_offset(x23, JB_X23<<3)
cfi_offset(x24, JB_X24<<3)
cfi_offset(x25, JB_X25<<3)
cfi_offset(x26, JB_X26<<3)
cfi_offset(x27, JB_X27<<3)
cfi_offset(x28, JB_X28<<3)
cfi_offset(x29, JB_X29<<3)
cfi_offset(x30, JB_LR<<3)
cfi_offset( d8, JB_D8<<3)
cfi_offset( d9, JB_D9<<3)
cfi_offset(d10, JB_D10<<3)
cfi_offset(d11, JB_D11<<3)
cfi_offset(d12, JB_D12<<3)
cfi_offset(d13, JB_D13<<3)
cfi_offset(d14, JB_D14<<3)
cfi_offset(d15, JB_D15<<3)
#if IS_IN(libc)
/* Disable ZA state of SME in libc.a and libc.so, but not in ld.so. */
@ -69,6 +47,29 @@ ENTRY (__longjmp)
# endif
#endif
cfi_def_cfa (x0, 0)
cfi_offset (x19, JB_X19<<3)
cfi_offset (x20, JB_X20<<3)
cfi_offset (x21, JB_X21<<3)
cfi_offset (x22, JB_X22<<3)
cfi_offset (x23, JB_X23<<3)
cfi_offset (x24, JB_X24<<3)
cfi_offset (x25, JB_X25<<3)
cfi_offset (x26, JB_X26<<3)
cfi_offset (x27, JB_X27<<3)
cfi_offset (x28, JB_X28<<3)
cfi_offset (x29, JB_X29<<3)
cfi_offset (x30, JB_LR<<3)
cfi_offset ( d8, JB_D8<<3)
cfi_offset ( d9, JB_D9<<3)
cfi_offset (d10, JB_D10<<3)
cfi_offset (d11, JB_D11<<3)
cfi_offset (d12, JB_D12<<3)
cfi_offset (d13, JB_D13<<3)
cfi_offset (d14, JB_D14<<3)
cfi_offset (d15, JB_D15<<3)
ldp x19, x20, [x0, #JB_X19<<3]
ldp x21, x22, [x0, #JB_X21<<3]
ldp x23, x24, [x0, #JB_X23<<3]