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Tue, 07 Jan 2025 13:35:58 -0800 (PST) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-72aad8fb851sm33951646b3a.132.2025.01.07.13.35.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jan 2025 13:35:57 -0800 (PST) From: Charlie Jenkins Date: Tue, 07 Jan 2025 13:35:44 -0800 Subject: [PATCH v4 1/2] RISC-V: Fix display of partial instructions MIME-Version: 1.0 Message-Id: <20250107-fix_objdump_partial_insn-v4-1-5bca13284275@rivosinc.com> References: <20250107-fix_objdump_partial_insn-v4-0-5bca13284275@rivosinc.com> In-Reply-To: <20250107-fix_objdump_partial_insn-v4-0-5bca13284275@rivosinc.com> To: jiawei , Nelson Chu , Charlie Jenkins , Jan Beulich , Andrew Burgess Cc: gdb-patches , Binutils X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=4033; i=charlie@rivosinc.com; h=from:subject:message-id; bh=8kJxpAnLfnfc5QHGdxLiuoAC4PZAS8jEY7N8YaKqx3s=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ3rtPGslZcuZjvt+/Iqa7zj9in8eT69Z8Hapf5+6fRt+n xFYzb+ko5SFQYyDQVZMkYXnWgNz6x39sqOiZRNg5rAygQxh4OIUgIncX8jwP8YyZRP7xDV/3nYk 7xXYtat89u/HLdNthOKEysIr0k1vVTIybDhd6qj5PdVLebHLnJvG6fo1vqf7XGZN/ByQzfOz5aI ZHwA= X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 X-Spam-Status: No, score=-12.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~patchwork=sourceware.org@sourceware.org As of commit e43d8768d909 ("RISC-V: Fix disassemble fetch fail return value.") partial instructions are no longer displayed by objdump. While that commit fixed the behavior of print_insn_riscv() returning the arbitrary status value upon failure, it caused the behavior of dumping instructions to change. Allow partial instructions to be displayed once again and only return -1 if no part of the instruction was able to be displayed. Fixes: e43d8768d909 ("RISC-V: Fix disassemble fetch fail return value.") Signed-off-by: Charlie Jenkins Acked-By: Andrew Burgess --- opcodes/riscv-dis.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 49 insertions(+), 4 deletions(-) diff --git a/opcodes/riscv-dis.c b/opcodes/riscv-dis.c index 101380f93aafbd528ba0020371f0c43a85f41bd1..8f551f5bddb9289458b54dfee90d6c014941f9a3 100644 --- a/opcodes/riscv-dis.c +++ b/opcodes/riscv-dis.c @@ -1308,6 +1308,14 @@ riscv_disassemble_data (bfd_vma memaddr ATTRIBUTE_UNUSED, (*info->fprintf_styled_func) (info->stream, dis_style_immediate, "0x%04x", (unsigned) data); break; + case 3: + info->bytes_per_line = 7; + (*info->fprintf_styled_func) + (info->stream, dis_style_assembler_directive, ".word"); + (*info->fprintf_styled_func) (info->stream, dis_style_text, "\t"); + (*info->fprintf_styled_func) + (info->stream, dis_style_immediate, "0x%06x", (unsigned) data); + break; case 4: info->bytes_per_line = 8; (*info->fprintf_styled_func) @@ -1360,12 +1368,31 @@ riscv_init_disasm_info (struct disassemble_info *info) return true; } +/* Fetch an instruction. If only a partial instruction is able to be fetched, + return the number of accessible bytes. */ + +static bfd_vma +fetch_insn (bfd_vma memaddr, + bfd_byte *packet, + bfd_vma dump_size, + struct disassemble_info *info, + volatile int *status) +{ + do + { + *status = (*info->read_memory_func) (memaddr, packet, dump_size, info); + } + while (*status != 0 && dump_size-- > 1); + + return dump_size; +} + int print_insn_riscv (bfd_vma memaddr, struct disassemble_info *info) { bfd_byte packet[RISCV_MAX_INSN_LEN]; insn_t insn = 0; - bfd_vma dump_size; + bfd_vma dump_size, bytes_fetched; int status; enum riscv_seg_mstate mstate; int (*riscv_disassembler) (bfd_vma, insn_t, const bfd_byte *, @@ -1398,24 +1425,42 @@ print_insn_riscv (bfd_vma memaddr, struct disassemble_info *info) else { /* Get the first 2-bytes to check the lenghth of instruction. */ - status = (*info->read_memory_func) (memaddr, packet, 2, info); + bytes_fetched = fetch_insn (memaddr, packet, 2, info, &status); if (status != 0) { (*info->memory_error_func) (status, memaddr, info); return -1; } + else if (bytes_fetched != 2) + { + /* Only the first byte was able to be read. Dump the partial + instruction. */ + dump_size = bytes_fetched; + info->bytes_per_chunk = dump_size; + riscv_disassembler = riscv_disassemble_data; + goto print; + } insn = (insn_t) bfd_getl16 (packet); dump_size = riscv_insn_length (insn); riscv_disassembler = riscv_disassemble_insn; } - /* Fetch the instruction to dump. */ - status = (*info->read_memory_func) (memaddr, packet, dump_size, info); + bytes_fetched = fetch_insn (memaddr, packet, dump_size, info, &status); + if (status != 0) { (*info->memory_error_func) (status, memaddr, info); return -1; } + else if (bytes_fetched != dump_size) + { + dump_size = bytes_fetched; + info->bytes_per_chunk = dump_size; + riscv_disassembler = riscv_disassemble_data; + } + + print: + insn = (insn_t) bfd_get_bits (packet, dump_size * 8, false); return (*riscv_disassembler) (memaddr, insn, packet, info); From patchwork Tue Jan 7 21:35:45 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 104302 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 081BD3857C4F for ; 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Tue, 07 Jan 2025 13:35:59 -0800 (PST) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-72aad8fb851sm33951646b3a.132.2025.01.07.13.35.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jan 2025 13:35:58 -0800 (PST) From: Charlie Jenkins Date: Tue, 07 Jan 2025 13:35:45 -0800 Subject: [PATCH v4 2/2] RISC-V: Add partial instruction display tests MIME-Version: 1.0 Message-Id: <20250107-fix_objdump_partial_insn-v4-2-5bca13284275@rivosinc.com> References: <20250107-fix_objdump_partial_insn-v4-0-5bca13284275@rivosinc.com> In-Reply-To: <20250107-fix_objdump_partial_insn-v4-0-5bca13284275@rivosinc.com> To: jiawei , Nelson Chu , Charlie Jenkins , Jan Beulich , Andrew Burgess Cc: gdb-patches , Binutils X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2557; i=charlie@rivosinc.com; h=from:subject:message-id; bh=5FCXyC79OlTwJ4DUiXkdpMeMNxBdKNe+HITGvZ3U4gU=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ3rtPGv5O59+FCw4nj25d0okwwShOEaF4yWvxeemGFncT MhumprfUcrCIMbBICumyMJzrYG59Y5+2VHRsgkwc1iZQIYwcHEKwEQ+VzL84XLlfBG6Md29IJUp coNJs3XG272dco3yPbad9kIdajpfGBnmTnlcuFS0p+Vl3YHJPE7T+RZe/vLPYIb8735H03O73s5 gAAA= X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 X-Spam-Status: No, score=-12.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, GIT_PATCH_0, KAM_LOTSOFHASH, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~patchwork=sourceware.org@sourceware.org When objdump is specified with a stop address that ends up in the middle of an instruction, the partial instruction is expected to be displayed. These three tests check that the partial instruction is correctly displayed when there are 1, 2, or 3 bytes of the instruction dumped. Signed-off-by: Charlie Jenkins --- gas/testsuite/gas/riscv/dis-partial-insn-byte.d | 11 +++++++++++ gas/testsuite/gas/riscv/dis-partial-insn-short.d | 11 +++++++++++ gas/testsuite/gas/riscv/dis-partial-insn-word.d | 11 +++++++++++ gas/testsuite/gas/riscv/dis-partial-insn.s | 2 ++ 4 files changed, 35 insertions(+) diff --git a/gas/testsuite/gas/riscv/dis-partial-insn-byte.d b/gas/testsuite/gas/riscv/dis-partial-insn-byte.d new file mode 100644 index 0000000000000000000000000000000000000000..f8c149ca881773a945d53ea92856375b7815a38e --- /dev/null +++ b/gas/testsuite/gas/riscv/dis-partial-insn-byte.d @@ -0,0 +1,11 @@ +#as: +#source: dis-partial-insn.s +#objdump: --start-address 0 --stop-address 1 -d + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+000 : +[ ]+0:[ ]+13[ ]+.byte[ ]+0x13 diff --git a/gas/testsuite/gas/riscv/dis-partial-insn-short.d b/gas/testsuite/gas/riscv/dis-partial-insn-short.d new file mode 100644 index 0000000000000000000000000000000000000000..4a7d6d98b82632f7b35b40327b192f4af33d42f0 --- /dev/null +++ b/gas/testsuite/gas/riscv/dis-partial-insn-short.d @@ -0,0 +1,11 @@ +#as: +#source: dis-partial-insn.s +#objdump: --start-address 0 --stop-address 2 -d + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+000 : +[ ]+0:[ ]+0013[ ]+.short[ ]+0x0013 diff --git a/gas/testsuite/gas/riscv/dis-partial-insn-word.d b/gas/testsuite/gas/riscv/dis-partial-insn-word.d new file mode 100644 index 0000000000000000000000000000000000000000..2f52153075e77361a3dd3f1e3071949eb89c6fe6 --- /dev/null +++ b/gas/testsuite/gas/riscv/dis-partial-insn-word.d @@ -0,0 +1,11 @@ +#as: +#source: dis-partial-insn.s +#objdump: --start-address 0 --stop-address 3 -d + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+000 : +[ ]+0:[ ]+000013[ ]+.word[ ]+0x000013 diff --git a/gas/testsuite/gas/riscv/dis-partial-insn.s b/gas/testsuite/gas/riscv/dis-partial-insn.s new file mode 100644 index 0000000000000000000000000000000000000000..99456883315ed914786d18cfc2623aa6fa99cc84 --- /dev/null +++ b/gas/testsuite/gas/riscv/dis-partial-insn.s @@ -0,0 +1,2 @@ +target: + nop