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Thu, 26 Dec 2024 05:53:16 -0500 (EST) From: Celeste Liu Date: Thu, 26 Dec 2024 18:52:51 +0800 Subject: [PATCH v4 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-v4-1-4496a29d0436@coelacanthus.name> References: <20241226-riscv-new-regset-v4-0-4496a29d0436@coelacanthus.name> In-Reply-To: <20241226-riscv-new-regset-v4-0-4496a29d0436@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=owJ4nJvAy8zAJeafov85RWVtBeNptSSG9FzTSayCcadjtL1TfZwFL4VaWoskah41DHl4IebMZ 7FL5VfXM3aUsjCIcTHIiimy5JWw/OS8dLZ7b8f2Lpg5rEwgQxi4OAVgIg0pDP99Fx6OOnhNRGqf 2n/7hM8WTOH/rmf/4M5+eEHWKeOfVcAvhv8+R+w5D20PWXlNYpeEz8QVso8sr2+7ZvHljK3kl+5 +7idsAH7FSLQ= X-Developer-Key: i=uwu@coelacanthus.name; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 8C54A20002 X-Rspam-User: X-Stat-Signature: r9ooriu7q7r3uyc7gjmfkhci7wkgp318 X-HE-Tag: 1735210379-881685 X-HE-Meta: U2FsdGVkX1/StXF7uyKJaUdFapRukItTH4+mk7bqN7EStAxySQzlvRJTP38wRyiMDJrYwDHoaRoPcHvLnREIwz+8iu+iGCKFalfyFC2GpoOteR1SRcaMQdKaUduvHtTsmxJuUV1Ojl6MGiGb1322HiFr8XqGTuE3hDUOTz3fWgOcQoSXn6RbribgSgFt0k9NfkRY3surpFxR1WBYkQjkeE/dsUL5bTqx5q0G6V5f29ync+4kei+UUYGGd2XpikCJ4T2uwPIFKRk9cQjzJsJoCmCKovpck+qDagbByZnKtDb0hHzMHMTrmzJAl9MFNK185aBPk4/eStOufLFnIHz3odfVDd4JUMAMLY8I4ZvTkZ+5m0whIjFbV+eBB/t9KcZTT/HGTjOevShMSpTkqV4iKAEQrLGYzvb50RQHpXhB+sN8Lr/gjkTViU9fs1KcnSzCIks4wciM4GeYdgUsl5RuPTHgCeNSyDPjcRBYmTJYNyOVeMDZc3troLBP5PRWsfcTvW3k4uau33RtsFh+PyhztbYNNq12Ayl838Fr2SqckaWqCqB90Do7IZljYYqdr99Jh+B7ynQnOq/hxXQKjOPt2YJOkzFcuaSm5IDSuwD+KQHjtt3QZKELJkGSOSkXksAsRuVc6Qlk1Lx5JemNljUKwqyiVItjf0HVej+JgF1OYgQlZJoz04BAUk+CTciHMqJzcVQFvH6yNiz0CjYVsCP6I708bz2ZQVIp18Lw5oE/ScftpAmP8jUCY8VRG/7V+LAT/Ys7oRUHwpDwPlCKlsjaq/CMqLFfigJ5KdklIeCDJn5hZ8cmeTijxId3qULovnxBcewKX6fHwiVMfqaXtgD+B1cZwF6z2jO53Ey31cy4ZMgopcP7LvI+HHbPuP6EpqvxKWvp2ahl57EUl2/7ziwIf7eQIsrSa2wbsk9998EMHfsnJ9J09EoR5G8qMVix2GUirOhVLeRZ3DehMA+HrIE jqIUe/TN 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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