From 6650f7bd18f8161b9f666d3e65a6346e23a9d85f Mon Sep 17 00:00:00 2001 From: Yury Norov Date: Sat, 3 Dec 2016 18:50:43 +0530 Subject: [PATCH] ld: aarch64: fix TLS relaxation where TCB_SIZE is used TCB_SIZE is 2*sizeof(void *), which is 0x10 for lp64, and 0x8 for ilp32. During relaxation, ld goes to do a replace: bl __tls_get_addr => add R0, R0, TCB_SIZE But actual implementation is: bfd_putl32 (0x91004000, contents + rel->r_offset + 4); Which is equivalent of add x0, x0, 0x10. This is wrong for ilp32. The possible fix for it is: bfd_putl32 (0x91000000 | (TCB_SIZE<<10), contents + rel->r_offset + 4); But ilp32 also needs w-registers, so it's simpler to put proper instruction in #if/#else condition. THere are 2 such relaxations in elfNN_aarch64_tls_relax(), and so 2 new tests added for ilp32 mode to test it. Yury --- bfd/elfnn-aarch64.c | 18 +++++++++++++++--- ld/testsuite/ld-aarch64/aarch64-elf.exp | 2 ++ .../ld-aarch64/tls-relax-ld-le-small-ilp32.d | 14 ++++++++++++++ .../ld-aarch64/tls-relax-ld-le-tiny-ilp32.d | 13 +++++++++++++ 4 files changed, 44 insertions(+), 3 deletions(-) create mode 100644 ld/testsuite/ld-aarch64/tls-relax-ld-le-small-ilp32.d create mode 100644 ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny-ilp32.d diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c index ffa8e6a9970..b05e7cfa386 100644 --- a/bfd/elfnn-aarch64.c +++ b/bfd/elfnn-aarch64.c @@ -5951,7 +5951,9 @@ elfNN_aarch64_tls_relax (struct elf_aarch64_link_hash_table *globals, case BFD_RELOC_AARCH64_TLSLD_ADR_PREL21: /* LD->LE relaxation (tiny): adr x0, :tlsldm:x => mrs x0, tpidr_el0 - bl __tls_get_addr => add x0, x0, TCB_SIZE + bl __tls_get_addr => add R0, R0, TCB_SIZE + + Where R is x for lp64 mode, and w for ilp32 mode. */ if (is_local) { @@ -5960,7 +5962,11 @@ elfNN_aarch64_tls_relax (struct elf_aarch64_link_hash_table *globals, /* No need of CALL26 relocation for tls_get_addr. */ rel[1].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE); bfd_putl32 (0xd53bd040, contents + rel->r_offset + 0); +#if ARCH_SIZE ==64 bfd_putl32 (0x91004000, contents + rel->r_offset + 4); +#else + bfd_putl32 (0x11002000, contents + rel->r_offset + 4); +#endif return bfd_reloc_ok; } return bfd_reloc_continue; @@ -5978,8 +5984,10 @@ elfNN_aarch64_tls_relax (struct elf_aarch64_link_hash_table *globals, case BFD_RELOC_AARCH64_TLSLD_ADD_LO12_NC: /* LD->LE relaxation (small): - add x0, #:tlsldm_lo12:x => add x0, x0, TCB_SIZE + add x0, #:tlsldm_lo12:x => add R0, R0, TCB_SIZE bl __tls_get_addr => nop + + Where R is x for lp64 mode, and w for ilp32 mode. */ if (is_local) { @@ -5987,8 +5995,12 @@ elfNN_aarch64_tls_relax (struct elf_aarch64_link_hash_table *globals, BFD_ASSERT (ELFNN_R_TYPE (rel[1].r_info) == AARCH64_R (CALL26)); /* No need of CALL26 relocation for tls_get_addr. */ rel[1].r_info = ELFNN_R_INFO (STN_UNDEF, R_AARCH64_NONE); +#if ARCH_SIZE ==64 bfd_putl32 (0x91004000, contents + rel->r_offset + 0); - bfd_putl32 (0xd503201f, contents + rel->r_offset + 4); +#else + bfd_putl32 (0x11002000, contents + rel->r_offset + 0); +#endif + bfd_putl32 (INSN_NOP, contents + rel->r_offset + 4); return bfd_reloc_ok; } return bfd_reloc_continue; diff --git a/ld/testsuite/ld-aarch64/aarch64-elf.exp b/ld/testsuite/ld-aarch64/aarch64-elf.exp index de158fe1d1a..8fba2311e2a 100644 --- a/ld/testsuite/ld-aarch64/aarch64-elf.exp +++ b/ld/testsuite/ld-aarch64/aarch64-elf.exp @@ -228,7 +228,9 @@ run_dump_test_lp64 "tls-relax-large-desc-le-be" run_dump_test "tls-relax-gdesc-ie" run_dump_test "tls-relax-ie-le" run_dump_test "tls-relax-ld-le-small" +run_dump_test "tls-relax-ld-le-small-ilp32" run_dump_test "tls-relax-ld-le-tiny" +run_dump_test "tls-relax-ld-le-tiny-ilp32" run_dump_test "tls-desc-ie" run_dump_test "tls-relax-gdesc-ie-2" run_dump_test "tls-relax-gdesc-le-2" diff --git a/ld/testsuite/ld-aarch64/tls-relax-ld-le-small-ilp32.d b/ld/testsuite/ld-aarch64/tls-relax-ld-le-small-ilp32.d new file mode 100644 index 00000000000..0f86d932ca5 --- /dev/null +++ b/ld/testsuite/ld-aarch64/tls-relax-ld-le-small-ilp32.d @@ -0,0 +1,14 @@ +#source: tls-relax-ld-le-small.s +#as: -mabi=ilp32 +#ld: -m [aarch64_choose_ilp32_emul] -T relocs-ilp32.ld -e0 +#objdump: -dr +#... + +10000: 910003fd mov x29, sp + +10004: d53bd040 mrs x0, tpidr_el0 + +10008: 11002000 add w0, w0, #0x8 + +1000c: d503201f nop + +10010: d503201f nop + +10014: 91400001 add x1, x0, #0x0, lsl #12 + +10018: 91000021 add x1, x1, #0x0 + +1001c: 90000000 adrp x0, 10000 <.*> + +10020: d65f03c0 ret diff --git a/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny-ilp32.d b/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny-ilp32.d new file mode 100644 index 00000000000..e2a42503f96 --- /dev/null +++ b/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny-ilp32.d @@ -0,0 +1,13 @@ +#source: tls-relax-ld-le-tiny.s +#as: -mabi=ilp32 +#ld: -m [aarch64_choose_ilp32_emul] -T relocs-ilp32.ld -e0 +#objdump: -dr +#... + +10000: 910003fd mov x29, sp + +10004: d53bd040 mrs x0, tpidr_el0 + +10008: 11002000 add w0, w0, #0x8 + +1000c: d503201f nop + +10010: 91400001 add x1, x0, #0x0, lsl #12 + +10014: 91000021 add x1, x1, #0x0 + +10018: 90000000 adrp x0, 10000
+ +1001c: d65f03c0 ret -- 2.30.2