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[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.
This commit is contained in:
Szabolcs Nagy
parent
daa9bdb607
commit
e535139e82
@ -4,6 +4,12 @@
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* misc/tst-preadvwritev2.c (do_test): Add test for invalid flag.
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* misc/tst-preadvwritev64v2.c (do_test): Likewise.
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2017-06-21 Szabolcs Nagy <szabolcs.nagy@arm.com>
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* sysdeps/aarch64/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Add cfi
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annotation.
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(_dl_tlsdesc_resolve_rela, _dl_tlsdesc_resolve_hold): Likewise.
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2017-06-21 Szabolcs Nagy <szabolcs.nagy@arm.com>
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* sysdeps/aarch64/dl-machine.h (RTLD_START_1): Change _dl_argv to the
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@ -176,6 +176,8 @@ _dl_tlsdesc_dynamic:
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# define NSAVEXREGPAIRS 2
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stp x29, x30, [sp,#-(32+16*NSAVEXREGPAIRS)]!
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cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS)
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cfi_rel_offset (x29, 0)
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cfi_rel_offset (x30, 8)
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mov x29, sp
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DELOUSE (0)
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@ -184,6 +186,10 @@ _dl_tlsdesc_dynamic:
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stp x1, x2, [sp, #32+16*0]
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stp x3, x4, [sp, #32+16*1]
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cfi_rel_offset (x1, 32)
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cfi_rel_offset (x2, 32+8)
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cfi_rel_offset (x3, 32+16)
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cfi_rel_offset (x4, 32+24)
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mrs x4, tpidr_el0
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/* The ldar here happens after the load from [x0] at the call site
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@ -213,6 +219,8 @@ _dl_tlsdesc_dynamic:
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ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS)
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cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS)
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cfi_restore (x29)
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cfi_restore (x30)
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# undef NSAVEXREGPAIRS
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RET
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2:
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@ -230,6 +238,20 @@ _dl_tlsdesc_dynamic:
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stp x13, x14, [sp, #16*4]
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stp x15, x16, [sp, #16*5]
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stp x17, x18, [sp, #16*6]
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cfi_rel_offset (x5, 0)
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cfi_rel_offset (x6, 8)
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cfi_rel_offset (x7, 16)
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cfi_rel_offset (x8, 16+8)
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cfi_rel_offset (x9, 16*2)
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cfi_rel_offset (x10, 16*2+8)
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cfi_rel_offset (x11, 16*3)
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cfi_rel_offset (x12, 16*3+8)
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cfi_rel_offset (x13, 16*4)
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cfi_rel_offset (x14, 16*4+8)
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cfi_rel_offset (x15, 16*5)
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cfi_rel_offset (x16, 16*5+8)
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cfi_rel_offset (x17, 16*6)
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cfi_rel_offset (x18, 16*6+8)
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SAVE_Q_REGISTERS
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@ -268,8 +290,14 @@ _dl_tlsdesc_dynamic:
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.align 2
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_dl_tlsdesc_resolve_rela:
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#define NSAVEXREGPAIRS 9
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/* The tlsdesc PLT entry pushes x2 and x3 to the stack. */
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cfi_adjust_cfa_offset (16)
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cfi_rel_offset (x2, 0)
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cfi_rel_offset (x3, 8)
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stp x29, x30, [sp, #-(32+16*NSAVEXREGPAIRS)]!
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cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS)
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cfi_rel_offset (x29, 0)
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cfi_rel_offset (x30, 8)
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mov x29, sp
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stp x1, x4, [sp, #32+16*0]
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stp x5, x6, [sp, #32+16*1]
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@ -280,6 +308,23 @@ _dl_tlsdesc_resolve_rela:
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stp x15, x16, [sp, #32+16*6]
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stp x17, x18, [sp, #32+16*7]
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str x0, [sp, #32+16*8]
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cfi_rel_offset (x1, 32)
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cfi_rel_offset (x4, 32+8)
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cfi_rel_offset (x5, 32+16)
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cfi_rel_offset (x6, 32+16+8)
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cfi_rel_offset (x7, 32+16*2)
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cfi_rel_offset (x8, 32+16*2+8)
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cfi_rel_offset (x9, 32+16*3)
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cfi_rel_offset (x10, 32+16*3+8)
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cfi_rel_offset (x11, 32+16*4)
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cfi_rel_offset (x12, 32+16*4+8)
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cfi_rel_offset (x13, 32+16*5)
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cfi_rel_offset (x14, 32+16*5+8)
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cfi_rel_offset (x15, 32+16*6)
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cfi_rel_offset (x16, 32+16*6+8)
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cfi_rel_offset (x17, 32+16*7)
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cfi_rel_offset (x18, 32+16*7+8)
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cfi_rel_offset (x0, 32+16*8)
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SAVE_Q_REGISTERS
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@ -304,6 +349,8 @@ _dl_tlsdesc_resolve_rela:
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ldp x17, x18, [sp, #32+16*7]
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ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS)
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cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS)
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cfi_restore (x29)
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cfi_restore (x30)
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ldp x2, x3, [sp], #16
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cfi_adjust_cfa_offset (-16)
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RET
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@ -332,6 +379,8 @@ _dl_tlsdesc_resolve_hold:
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1:
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stp x29, x30, [sp, #-(32+16*NSAVEXREGPAIRS)]!
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cfi_adjust_cfa_offset (32+16*NSAVEXREGPAIRS)
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cfi_rel_offset (x29, 0)
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cfi_rel_offset (x30, 8)
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mov x29, sp
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stp x1, x2, [sp, #32+16*0]
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stp x3, x4, [sp, #32+16*1]
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@ -343,6 +392,25 @@ _dl_tlsdesc_resolve_hold:
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stp x15, x16, [sp, #32+16*7]
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stp x17, x18, [sp, #32+16*8]
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str x0, [sp, #32+16*9]
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cfi_rel_offset (x1, 32)
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cfi_rel_offset (x2, 32+8)
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cfi_rel_offset (x3, 32+16)
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cfi_rel_offset (x4, 32+16+8)
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cfi_rel_offset (x5, 32+16*2)
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cfi_rel_offset (x6, 32+16*2+8)
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cfi_rel_offset (x7, 32+16*3)
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cfi_rel_offset (x8, 32+16*3+8)
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cfi_rel_offset (x9, 32+16*4)
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cfi_rel_offset (x10, 32+16*4+8)
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cfi_rel_offset (x11, 32+16*5)
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cfi_rel_offset (x12, 32+16*5+8)
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cfi_rel_offset (x13, 32+16*6)
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cfi_rel_offset (x14, 32+16*6+8)
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cfi_rel_offset (x15, 32+16*7)
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cfi_rel_offset (x16, 32+16*7+8)
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cfi_rel_offset (x17, 32+16*8)
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cfi_rel_offset (x18, 32+16*8+8)
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cfi_rel_offset (x0, 32+16*9)
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SAVE_Q_REGISTERS
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@ -367,6 +435,8 @@ _dl_tlsdesc_resolve_hold:
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ldp x17, x18, [sp, #32+16*8]
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ldp x29, x30, [sp], #(32+16*NSAVEXREGPAIRS)
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cfi_adjust_cfa_offset (-32-16*NSAVEXREGPAIRS)
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cfi_restore (x29)
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cfi_restore (x30)
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RET
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cfi_endproc
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.size _dl_tlsdesc_resolve_hold, .-_dl_tlsdesc_resolve_hold
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