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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2017-06-21 15:01:18 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2017-06-21 15:04:37 +0100 |
| commit | e535139e82e5a4bb0ed63b0b5165f03a9b2d0e52 (patch) | |
| tree | 1202f987433478e8056bc83273ce2a80cf1e2d44 /sysdeps | |
| parent | daa9bdb607e962726cc733c9b82c01bd68765736 (diff) | |
| download | glibc-e535139e82e5a4bb0ed63b0b5165f03a9b2d0e52.tar.gz glibc-e535139e82e5a4bb0ed63b0b5165f03a9b2d0e52.tar.xz glibc-e535139e82e5a4bb0ed63b0b5165f03a9b2d0e52.zip | |
[AArch64] Add more cfi annotations to tlsdesc entry points
Backtrace through _dl_tlsdesc_resolve_rela was broken because the offset of x30 from cfa was not in the debug info. Add enough annotation so backtracing from the dynamic linker through tlsdesc entry points works and the debugger shows registers correctly.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/aarch64/dl-tlsdesc.S | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/sysdeps/aarch64/dl-tlsdesc.S b/sysdeps/aarch64/dl-tlsdesc.S index 94679a04ca..a70cfd513c 100644 --- a/sysdeps/aarch64/dl-tlsdesc.S +++ b/sysdeps/aarch64/dl-tlsdesc.S @@ -176,6 +176,8 @@ _dl_tlsdesc_dynamic: # define NSAVEXREGPAIRS 2 stp x29, x30, [sp,#-(32+16*NSAVEXREGPAIRS)]! cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) mov x29, sp DELOUSE (0) @@ -184,6 +186,10 @@ _dl_tlsdesc_dynamic: stp x1, x2, [sp, #32+16*0] stp x3, x4, [sp, #32+16*1] + cfi_rel_offset (x1, 32) + cfi_rel_offset (x2, 32+8) + cfi_rel_offset (x3, 32+16) + cfi_rel_offset (x4, 32+24) mrs x4, tpidr_el0 /* The ldar here happens after the load from [x0] at the call site @@ -213,6 +219,8 @@ _dl_tlsdesc_dynamic: ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS) cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS) + cfi_restore (x29) + cfi_restore (x30) # undef NSAVEXREGPAIRS RET 2: @@ -230,6 +238,20 @@ _dl_tlsdesc_dynamic: stp x13, x14, [sp, #16*4] stp x15, x16, [sp, #16*5] stp x17, x18, [sp, #16*6] + cfi_rel_offset (x5, 0) + cfi_rel_offset (x6, 8) + cfi_rel_offset (x7, 16) + cfi_rel_offset (x8, 16+8) + cfi_rel_offset (x9, 16*2) + cfi_rel_offset (x10, 16*2+8) + cfi_rel_offset (x11, 16*3) + cfi_rel_offset (x12, 16*3+8) + cfi_rel_offset (x13, 16*4) + cfi_rel_offset (x14, 16*4+8) + cfi_rel_offset (x15, 16*5) + cfi_rel_offset (x16, 16*5+8) + cfi_rel_offset (x17, 16*6) + cfi_rel_offset (x18, 16*6+8) SAVE_Q_REGISTERS @@ -268,8 +290,14 @@ _dl_tlsdesc_dynamic: .align 2 _dl_tlsdesc_resolve_rela: #define NSAVEXREGPAIRS 9 + /* The tlsdesc PLT entry pushes x2 and x3 to the stack. */ + cfi_adjust_cfa_offset (16) + cfi_rel_offset (x2, 0) + cfi_rel_offset (x3, 8) stp x29, x30, [sp, #-(32+16*NSAVEXREGPAIRS)]! cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) mov x29, sp stp x1, x4, [sp, #32+16*0] stp x5, x6, [sp, #32+16*1] @@ -280,6 +308,23 @@ _dl_tlsdesc_resolve_rela: stp x15, x16, [sp, #32+16*6] stp x17, x18, [sp, #32+16*7] str x0, [sp, #32+16*8] + cfi_rel_offset (x1, 32) + cfi_rel_offset (x4, 32+8) + cfi_rel_offset (x5, 32+16) + cfi_rel_offset (x6, 32+16+8) + cfi_rel_offset (x7, 32+16*2) + cfi_rel_offset (x8, 32+16*2+8) + cfi_rel_offset (x9, 32+16*3) + cfi_rel_offset (x10, 32+16*3+8) + cfi_rel_offset (x11, 32+16*4) + cfi_rel_offset (x12, 32+16*4+8) + cfi_rel_offset (x13, 32+16*5) + cfi_rel_offset (x14, 32+16*5+8) + cfi_rel_offset (x15, 32+16*6) + cfi_rel_offset (x16, 32+16*6+8) + cfi_rel_offset (x17, 32+16*7) + cfi_rel_offset (x18, 32+16*7+8) + cfi_rel_offset (x0, 32+16*8) SAVE_Q_REGISTERS @@ -304,6 +349,8 @@ _dl_tlsdesc_resolve_rela: ldp x17, x18, [sp, #32+16*7] ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS) cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS) + cfi_restore (x29) + cfi_restore (x30) ldp x2, x3, [sp], #16 cfi_adjust_cfa_offset (-16) RET @@ -332,6 +379,8 @@ _dl_tlsdesc_resolve_hold: 1: stp x29, x30, [sp, #-(32+16*NSAVEXREGPAIRS)]! cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) mov x29, sp stp x1, x2, [sp, #32+16*0] stp x3, x4, [sp, #32+16*1] @@ -343,6 +392,25 @@ _dl_tlsdesc_resolve_hold: stp x15, x16, [sp, #32+16*7] stp x17, x18, [sp, #32+16*8] str x0, [sp, #32+16*9] + cfi_rel_offset (x1, 32) + cfi_rel_offset (x2, 32+8) + cfi_rel_offset (x3, 32+16) + cfi_rel_offset (x4, 32+16+8) + cfi_rel_offset (x5, 32+16*2) + cfi_rel_offset (x6, 32+16*2+8) + cfi_rel_offset (x7, 32+16*3) + cfi_rel_offset (x8, 32+16*3+8) + cfi_rel_offset (x9, 32+16*4) + cfi_rel_offset (x10, 32+16*4+8) + cfi_rel_offset (x11, 32+16*5) + cfi_rel_offset (x12, 32+16*5+8) + cfi_rel_offset (x13, 32+16*6) + cfi_rel_offset (x14, 32+16*6+8) + cfi_rel_offset (x15, 32+16*7) + cfi_rel_offset (x16, 32+16*7+8) + cfi_rel_offset (x17, 32+16*8) + cfi_rel_offset (x18, 32+16*8+8) + cfi_rel_offset (x0, 32+16*9) SAVE_Q_REGISTERS @@ -367,6 +435,8 @@ _dl_tlsdesc_resolve_hold: ldp x17, x18, [sp, #32+16*8] ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS) cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS) + cfi_restore (x29) + cfi_restore (x30) RET cfi_endproc .size _dl_tlsdesc_resolve_hold, .-_dl_tlsdesc_resolve_hold |