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Tue, 14 Jan 2025 15:25:24 -0500 (EST) From: Celeste Liu Date: Wed, 15 Jan 2025 04:24:58 +0800 Subject: [PATCH v5 1/2] riscv/ptrace: add new regset to access original a0 register MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20250115-riscv-new-regset-v5-1-d0e6ec031a23@coelacanthus.name> References: <20250115-riscv-new-regset-v5-0-d0e6ec031a23@coelacanthus.name> In-Reply-To: <20250115-riscv-new-regset-v5-0-d0e6ec031a23@coelacanthus.name> To: Oleg Nesterov , Paul Walmsley , Palmer Dabbelt , Eric Biederman , Kees Cook , Shuah Khan , Albert Ou Cc: Alexandre Ghiti , "Dmitry V. Levin" , Andrea Bolognani , =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= , Thomas Gleixner , Ron Economos , Charlie Jenkins , Andrew Jones , Quan Zhou , Felix Yan , Ruizhe Pan , Guo Ren , Yao Zi , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Celeste Liu , stable@vger.kernel.org, =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=3197; i=uwu@coelacanthus.name; h=from:subject:message-id; bh=Bd0I0lIMKMC4KxEOjUIKWSGVerkNEic9IL2ALFZ+R48=; b=owJ4nJvAy8zAJeafov85RWVtBeNptSSG9LYTahxei2+ZK7gL31/p1LKEL+S0u9TWg2pWopNOn ch+9jLbmr2jlIVBjItBVkyRJa+E5SfnpbPdezu2d8HMYWUCGcLAxSkAE1nRz8jQulbWYqJDmdS9 yH0Xd0ZtaImSZtoiOvOPRm3rh46tD2JXMjJMt7t61ztq0xrZnQ+9mjfNvhsjKVJToZO/aUXVeeO /8z/yAADK3kiB X-Developer-Key: i=uwu@coelacanthus.name; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 X-Rspamd-Queue-Id: E47A940014 X-Stat-Signature: er5w61puc9bzzzsgwf7o8166jy3unwxp X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1736886327-669397 X-HE-Meta: U2FsdGVkX19JxrZ6MmjPjL8kNOUNNzO1Ak5yzCIMggk39KeGutMoultzSZ1nvzls5JOgQ4XJEfgVFTOI7CbuymBLwfbQIj7nWkW+xi288kPoGygYAK47Og7HAlLn9+3eeHgMaclbXAlgQd4lUkGq91rgBo9sYNYuHkVKW4518g5hsapegb5sU9sGO9Q/5jFUjcxVgMQzj3jJIye93N9bcjBGZH5/zhKifOAWRfwsQqxNbUTuMgt/DOSc4ucSoVcQwaCd3c5RdIG2Flp8KE3vub79tubsE/07EOdDD6cunvSzPjkPIYZm3R5ZT2yULkFFcavdLc7wqAgSm4jv1W9SODYvOs6TNDyM7hZqizCYekjKwoOYnti8Ib6XOegUIUMTrK31BMflR68437hf7Lk2vVRjfQ9yzPqcQ03pLiluAp6+cc/g9azawr0HNKPROa2OAW96Cp9B1kNq5JLk+paFkzY47EFjZsFCfrFjG9aUQzYTcM+vyyFDAuFMVqi592fNRtfI1Krytf32sMlKjr21QtEcNGHqBHTqdBXZllMNC+2tmdBjBaZGV6h0v1hjMuusaxZH3t0GItyvW2OEGMIjW8DhCzkH/IlkHY+y1H0eC4yZjvqIT1eED9Ngd0mBAo2E8diYOdXguJ/lIkWtDhxi//UKS9khybBh3bWGfTewlTMJTd0GN1NBI5lcu/Ggmtp4OFyVJ6xB9A33wEidiDcDzsz3F/EQu51YGcq87m1U2fiIgvRHDOSJKOZ+qnGnlbv9W0u5NACR5DTC0kNgCLXcdEmaA3FFo4WBx+f0P4+vPDWXV0R/7xrC5jr/E7vnJQ/iOrDxqXp5wvOpi71+dzYL3BrsSc/ERn//zMsYwpBejz9+lTqI7OWNWAN2mI3agagRJF4TepX0glh6r1A5lOIQ8SoXen4WaeUE8KH4kA1Nt7SMUv3l1Az2Ndzvq6IaQ6YaKY23SkuzY4kkTzNvgcE snbi4YfS 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The orig_a0 is missing in struct user_regs_struct of riscv, and there is no way to add it without breaking UAPI. (See Link tag below) Like NT_ARM_SYSTEM_CALL do, we add a new regset name NT_RISCV_ORIG_A0 to access original a0 register from userspace via ptrace API. Fixes: e2c0cdfba7f6 ("RISC-V: User-facing API") Link: https://lore.kernel.org/all/59505464-c84a-403d-972f-d4b2055eeaac@gmail.com/ Cc: stable@vger.kernel.org Reviewed-by: Björn Töpel Signed-off-by: Celeste Liu --- arch/riscv/kernel/ptrace.c | 32 ++++++++++++++++++++++++++++++++ include/uapi/linux/elf.h | 1 + 2 files changed, 33 insertions(+) diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c index ea67e9fb7a583683b922fe2c017ea61f3bc848db..ef9ab74c8575a5c440155973b1c625c06a867c97 100644 --- a/arch/riscv/kernel/ptrace.c +++ b/arch/riscv/kernel/ptrace.c @@ -31,6 +31,7 @@ enum riscv_regset { #ifdef CONFIG_RISCV_ISA_SUPM REGSET_TAGGED_ADDR_CTRL, #endif + REGSET_ORIG_A0, }; static int riscv_gpr_get(struct task_struct *target, @@ -184,6 +185,29 @@ static int tagged_addr_ctrl_set(struct task_struct *target, } #endif +static int riscv_orig_a0_get(struct task_struct *target, + const struct user_regset *regset, + struct membuf to) +{ + return membuf_store(&to, task_pt_regs(target)->orig_a0); +} + +static int riscv_orig_a0_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + unsigned long orig_a0 = task_pt_regs(target)->orig_a0; + int ret; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &orig_a0, 0, -1); + if (ret) + return ret; + + task_pt_regs(target)->orig_a0 = orig_a0; + return 0; +} + static const struct user_regset riscv_user_regset[] = { [REGSET_X] = { .core_note_type = NT_PRSTATUS, @@ -224,6 +248,14 @@ static const struct user_regset riscv_user_regset[] = { .set = tagged_addr_ctrl_set, }, #endif + [REGSET_ORIG_A0] = { + .core_note_type = NT_RISCV_ORIG_A0, + .n = 1, + .size = sizeof(elf_greg_t), + .align = sizeof(elf_greg_t), + .regset_get = riscv_orig_a0_get, + .set = riscv_orig_a0_set, + }, }; static const struct user_regset_view riscv_user_native_view = { diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h index b44069d29cecc0f9de90ee66bfffd2137f4275a8..390060229601631da2fb27030d9fa2142e676c14 100644 --- a/include/uapi/linux/elf.h +++ b/include/uapi/linux/elf.h @@ -452,6 +452,7 @@ typedef struct elf64_shdr { #define NT_RISCV_CSR 0x900 /* RISC-V Control and Status Registers */ #define NT_RISCV_VECTOR 0x901 /* RISC-V vector registers */ #define NT_RISCV_TAGGED_ADDR_CTRL 0x902 /* RISC-V tagged address control (prctl()) */ +#define NT_RISCV_ORIG_A0 0x903 /* RISC-V original a0 register */ #define NT_LOONGARCH_CPUCFG 0xa00 /* LoongArch CPU config registers */ #define NT_LOONGARCH_CSR 0xa01 /* LoongArch control and status registers */ #define NT_LOONGARCH_LSX 0xa02 /* LoongArch Loongson SIMD Extension registers */ -- 2.48.0