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| author | Florian Weimer <fweimer@redhat.com> | 2016-12-02 16:52:57 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2016-12-02 16:52:57 +0100 |
| commit | 67aae64512cb42332f76a83e84ac2bc608ad4ad2 (patch) | |
| tree | f53b04d34129d9f7b60ce44dfb7c0ac06329ed12 /sysdeps/aarch64 | |
| parent | 8068094f6e2b3d29acbed8d738deaaf5cae5e320 (diff) | |
| download | glibc-67aae64512cb42332f76a83e84ac2bc608ad4ad2.tar.gz glibc-67aae64512cb42332f76a83e84ac2bc608ad4ad2.tar.xz glibc-67aae64512cb42332f76a83e84ac2bc608ad4ad2.zip | |
aarch64: Use explicit offsets in _dl_tlsdesc_dynamic
Commit 389d1f1b232b3d6b9d73ee2c50e543ace6675621 (“Partial ILP32 support for aarch64”) broke dynamic TLS support because a load offset changed: 0000000000000030 <_dl_tlsdesc_dynamic>: 30: a9bc7bfd stp x29, x30, [sp,#-64]! 34: 910003fd mov x29, sp 38: a9020be1 stp x1, x2, [sp,#32] 3c: a90313e3 stp x3, x4, [sp,#48] 40: d53bd044 mrs x4, tpidr_el0 44: c8dffc1f ldar xzr, [x0] 48: f9400401 ldr x1, [x0,#8] 4c: f9400080 ldr x0, [x4] 50: f9400823 ldr x3, [x1,#16] 54: f9400002 ldr x2, [x0] 58: eb02007f cmp x3, x2 5c: 540001a8 b.hi 90 <_dl_tlsdesc_dynamic+0x60> 60: f9400022 ldr x2, [x1] 64: 8b021000 add x0, x0, x2, lsl #4 68: f9400000 ldr x0, [x0] 6c: b100041f cmn x0, #0x1 70: 54000100 b.eq 90 <_dl_tlsdesc_dynamic+0x60> - 74: f9400421 ldr x1, [x1,#8] + 74: f9400821 ldr x1, [x1,#16] 78: 8b010000 add x0, x0, x1 … This commit introduces explicit struct offsets, generated from the C headers, fixing the regression.
Diffstat (limited to 'sysdeps/aarch64')
| -rw-r--r-- | sysdeps/aarch64/dl-tlsdesc.S | 18 | ||||
| -rw-r--r-- | sysdeps/aarch64/tlsdesc.sym | 3 |
2 files changed, 12 insertions, 9 deletions
diff --git a/sysdeps/aarch64/dl-tlsdesc.S b/sysdeps/aarch64/dl-tlsdesc.S index 42fa943859..9e557dd134 100644 --- a/sysdeps/aarch64/dl-tlsdesc.S +++ b/sysdeps/aarch64/dl-tlsdesc.S @@ -154,7 +154,7 @@ _dl_tlsdesc_undefweak: _dl_tlsdesc_dynamic (struct tlsdesc *tdp) { struct tlsdesc_dynamic_arg *td = tdp->arg; - dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + DTV_OFFSET); + dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + TCBHEAD_DTV); if (__builtin_expect (td->gen_count <= dtv[0].counter && (dtv[td->tlsinfo.ti_module].pointer.val != TLS_DTV_UNALLOCATED), @@ -193,18 +193,18 @@ _dl_tlsdesc_dynamic: td->entry in _dl_tlsdesc_resolve_rela_fixup ensuring that the load from [x0,#PTR_SIZE] here happens after the initialization of td->arg. */ ldar PTR_REG (zr), [x0] - ldr PTR_REG (1), [x0,#PTR_SIZE] - ldr PTR_REG (0), [x4] - ldr PTR_REG (3), [x1,#(PTR_SIZE * 2)] - ldr PTR_REG (2), [x0] + ldr PTR_REG (1), [x0,#TLSDESC_ARG] + ldr PTR_REG (0), [x4,#TCBHEAD_DTV] + ldr PTR_REG (3), [x1,#TLSDESC_GEN_COUNT] + ldr PTR_REG (2), [x0,#DTV_COUNTER] cmp PTR_REG (3), PTR_REG (2) b.hi 2f - ldr PTR_REG (2), [x1] + ldr PTR_REG (2), [x1,#TLSDESC_MODID] add PTR_REG (0), PTR_REG (0), PTR_REG (2), lsl #(PTR_LOG_SIZE + 1) - ldr PTR_REG (0), [x0] - cmn x0, #0x1 + ldr PTR_REG (0), [x0] /* Load val member of DTV entry. */ + cmp x0, #TLS_DTV_UNALLOCATED b.eq 2f - ldr PTR_REG (1), [x1,#(PTR_SIZE * 2)] + ldr PTR_REG (1), [x1,#TLSDESC_MODOFF] add PTR_REG (0), PTR_REG (0), PTR_REG (1) sub PTR_REG (0), PTR_REG (0), PTR_REG (4) 1: diff --git a/sysdeps/aarch64/tlsdesc.sym b/sysdeps/aarch64/tlsdesc.sym index 63766af612..a06a719779 100644 --- a/sysdeps/aarch64/tlsdesc.sym +++ b/sysdeps/aarch64/tlsdesc.sym @@ -13,3 +13,6 @@ TLSDESC_ARG offsetof(struct tlsdesc, arg) TLSDESC_GEN_COUNT offsetof(struct tlsdesc_dynamic_arg, gen_count) TLSDESC_MODID offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_module) TLSDESC_MODOFF offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_offset) +TCBHEAD_DTV offsetof(tcbhead_t, dtv) +DTV_COUNTER offsetof(dtv_t, counter) +TLS_DTV_UNALLOCATED TLS_DTV_UNALLOCATED |