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Add a forgotten in r283424 .eh_frame section with CFI & FDE records to allow

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stack unwinding through signal handler.

Reported by:	Dmitry Sivachenko
MFC after:	2 weeks
This commit is contained in:
dchagin 2016-05-09 07:38:47 +00:00
parent b816032a05
commit c62a8ee2d0
1 changed files with 32 additions and 0 deletions
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32
sys/amd64/linux/linux_locore.s
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@ -29,6 +29,7 @@ NON_GPROF_ENTRY(linux_rt_sigcode)
movq $LINUX_SYS_linux_rt_sigreturn,%rax /* linux_rt_sigreturn() */
syscall /* enter kernel with args */
hlt
.endrtsigcode:
0: jmp 0b
NON_GPROF_ENTRY(__vdso_clock_gettime)
@ -74,3 +75,34 @@ NON_GPROF_ENTRY(__vdso_getcpu)
.balign 4
.previous
#endif
.section .eh_frame,"a",@progbits
.LSTARTFRAMEDLSI0:
.long .LENDCIEDLSI0-.LSTARTCIEDLSI0
.LSTARTCIEDLSI0:
.long 0 /* CIE ID */
.byte 1 /* Version number */
.string "zR" /* NULL-terminated
* augmentation string
*/
.uleb128 1 /* Code alignment factor */
.sleb128 -4 /* Data alignment factor */
.byte 8 /* Return address register column */
.uleb128 1 /* Augmentation value length */
.byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
.byte 0x0c /* DW_CFA_def_cfa */
.uleb128 4
.uleb128 4
.byte 0x88 /* DW_CFA_offset, column 0x8 */
.uleb128 1
.align 4
.LENDCIEDLSI0:
.long .LENDFDEDLSI0-.LSTARTFDEDLSI0 /* Length FDE */
.LSTARTFDEDLSI0:
.long .LSTARTFDEDLSI0-.LSTARTFRAMEDLSI0 /* CIE pointer */
.long .startrtsigcode-. /* PC-relative start address */
.long .endrtsigcode-.startrtsigcode
.uleb128 0
.align 4
.LENDFDEDLSI0:
.previous