[{"id":3685141,"web_url":"http://patchwork.ozlabs.org/comment/3685141/","msgid":"<07cdf770-ae5a-4423-9fe5-b133e174fb47@e124511.cambridge.arm.com>","list_archive_url":null,"date":"2026-05-01T14:35:53","subject":"Re: [PATCH v1] [PATCH][GCC] aarch64: Fix tls debuginfo missing\n location info [PR97344]","submitter":{"id":90594,"url":"http://patchwork.ozlabs.org/api/people/90594/","name":"Alice Carlotti","email":"alice.carlotti@arm.com"},"content":"On Fri, May 01, 2026 at 11:16:29AM +0000, srinath.parvathaneni@arm.com wrote:\n> \n> Hi,\n> \n> This patch fixes the missing debuginfo for the TLS variables by emitting\n> \".xword %dtprel(symbol)\" along with DW_AT_location in .debug_info section.\n\nSupport for this directive was only recently added to Binutils (and isn't even\nin a released version yet), so GCC must only emit the directive if it's\nconfigured with an assembler and linker that also support it.\n\n> \n> Regression tested on aarch64-linux-gnu and found no regressions.\n> \n> Ok for trunk and backport to GCC-16?\n\nWhy specifically GCC 16 (as opposed to all open branches, or only trunk)?\n\nAlice\n\n> \n> Regards,\n> Srinath\n> \n> gcc/ChangeLog:\n> \n> PR target/97344\n> * config/aarch64/aarch64.cc (aarch64_output_dwarf_dtprel): Define\n> function.\n> (TARGET_ASM_OUTPUT_DWARF_DTPREL): Define macro.\n> \n> gcc/testsuite/ChangeLog:\n> \n> PR target/97344\n> * gcc.target/aarch64/pr49335.c: New test.\n> ---\n> gcc/config/aarch64/aarch64.cc | 16 +++++++++++++\n> gcc/testsuite/gcc.target/aarch64/pr97344.c | 26 ++++++++++++++++++++++\n> 2 files changed, 42 insertions(+)\n> create mode 100644 gcc/testsuite/gcc.target/aarch64/pr97344.c\n> \n\n> diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc\n> index 162947b047b..f37013885d9 100644\n> --- a/gcc/config/aarch64/aarch64.cc\n> +++ b/gcc/config/aarch64/aarch64.cc\n> @@ -1562,6 +1562,17 @@ aarch64_debugger_regno (unsigned regno)\n> return DWARF_FRAME_REGISTERS;\n> }\n> \n> +/* Implementation of TARGET_ASM_OUTPUT_DWARF_DTPREL. */\n> +static void\n> +aarch64_output_dwarf_dtprel (FILE *f, int size, rtx x)\n> +{\n> + gcc_assert (size == 8);\n> + fputs (\"\\t.xword\\t\", f);\n> + fputs (\"%dtprel(\", f);\n> + output_addr_const (f, x);\n> + fputs (\")\", f);\n> +}\n> +\n> /* Implement TARGET_DWARF_FRAME_REG_MODE. */\n> static machine_mode\n> aarch64_dwarf_frame_reg_mode (int regno)\n> @@ -33640,6 +33651,11 @@ aarch64_libgcc_floating_mode_supported_p\n> #undef TARGET_DWARF_FRAME_REG_MODE\n> #define TARGET_DWARF_FRAME_REG_MODE aarch64_dwarf_frame_reg_mode\n> \n> +#ifdef HAVE_AS_TLS\n> +#undef TARGET_ASM_OUTPUT_DWARF_DTPREL\n> +#define TARGET_ASM_OUTPUT_DWARF_DTPREL aarch64_output_dwarf_dtprel\n> +#endif\n> +\n> #undef TARGET_OUTPUT_CFI_DIRECTIVE\n> #define TARGET_OUTPUT_CFI_DIRECTIVE aarch64_output_cfi_directive\n> \n> diff --git a/gcc/testsuite/gcc.target/aarch64/pr97344.c b/gcc/testsuite/gcc.target/aarch64/pr97344.c\n> new file mode 100644\n> index 00000000000..b491bce0cfb\n> --- /dev/null\n> +++ b/gcc/testsuite/gcc.target/aarch64/pr97344.c\n> @@ -0,0 +1,26 @@\n> +/* { dg-do compile } */\n> +/* { dg-require-effective-target tls_native } */\n> +/* { dg-options \"-O0 -g\" } */\n> +\n> +#include \n> +\n> +__thread unsigned long rage = 1;\n> +__thread unsigned long ire = 2;\n> +\n> +void*\n> +increase_rage()\n> +{\n> + ++rage;\n> + ++ire;\n> + printf (\"Rage counter for: %d/%d\\n\", rage, ire);\n> +}\n> +\n> +int\n> +main ()\n> +{\n> + increase_rage();\n> + printf (\"Rage counter %d/%d\\n\", rage, ire);\n> +}\n> +\n> +/* { dg-final { scan-assembler \".xword\\t%dtprel\\\\(rage\\\\)\" } } */\n> +/* { dg-final { scan-assembler \".xword\\t%dtprel\\\\(ire\\\\)\" } } */","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=m7F95nUy;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=m7F95nUy;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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