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Make rtld_bind_start() debugger friendly.

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Save link register and annotate call frame structure so debugger can unwind
call frame created by rtld_bind_start().

MFC after:	2 weeks
This commit is contained in:
Michal Meloun 2018-02-27 15:35:11 +00:00
parent 81cb170fea
commit fad101b3f2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=330073
1 changed files with 15 additions and 5 deletions
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20
libexec/rtld-elf/aarch64/rtld_start.S
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@ -55,7 +55,15 @@ END(.rtld_start)
* x17 = &_rtld_bind_start
*/
ENTRY(_rtld_bind_start)
.cfi_startproc
mov x17, sp
/* Save frame pointer and SP */
stp x29, x30, [sp, #-16]!
mov x29, sp
.cfi_def_cfa x29, 16
.cfi_offset x30, -8
.cfi_offset x29, -16
/* Save the arguments */
stp x0, x1, [sp, #-16]!
@ -84,9 +92,6 @@ ENTRY(_rtld_bind_start)
/* Call into rtld */
bl _rtld_bind
/* Restore the registers saved by the plt code */
ldp xzr, x30, [sp, #(5 * 16 + 4 * 32)]
/* Backup the address to branch to */
mov x16, x0
@ -100,11 +105,16 @@ ENTRY(_rtld_bind_start)
ldp x4, x5, [sp], #16
ldp x2, x3, [sp], #16
ldp x0, x1, [sp], #16
/* And the part of the stack the plt entry handled */
add sp, sp, #16
/* Restore frame pointer */
ldp x29, xzr, [sp], #16
/* Restore link register saved by the plt code */
ldp xzr, x30, [sp], #16
/* Call into the correct function */
br x16
.cfi_endproc
END(_rtld_bind_start)
/*