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Thu, 26 Dec 2024 05:45:35 -0500 (EST) From: Celeste Liu Date: Thu, 26 Dec 2024 18:45:09 +0800 Subject: [PATCH v3 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: <20241226-riscv-new-regset-v3-1-f5b96465826b@coelacanthus.name> References: <20241226-riscv-new-regset-v3-0-f5b96465826b@coelacanthus.name> In-Reply-To: <20241226-riscv-new-regset-v3-0-f5b96465826b@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=ltD8Q1yJuFcwflR+5zmJHqfB8aeFKvQGlw/4hXFU+gg=; b=owJ4nJvAy8zAJeafov85RWVtBeNptSSG9FzjfcFzW5JSdpl75XUxC/ltnaLIqDsn6mp9ALeE/ /UNjTpGnztKWRjEuBhkxRRZ8kpYfnJeOtu9t2N7F8wcViaQIQxcnAIwkbY4hr+CYlO/Xjrb7vv1 +Z2EKf+Uc45vtstX3O5heYTPZ/69PkYfhv+pU2QfOJ+VmqvmXlw/Sez2geWKDfKuot+ldE1LVY8 xbeEGAGoyRRQ= X-Developer-Key: i=uwu@coelacanthus.name; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 3820B4000F X-Stat-Signature: 4utyunds8dfwtkdggiwz8iy7naftif4w X-Rspam-User: X-HE-Tag: 1735209892-974715 X-HE-Meta: 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 A1C5Nkq4 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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 */ -- 2.47.1