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[174.21.76.141]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fac15993c5sm90403755ad.244.2024.07.02.16.41.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jul 2024 16:41:58 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, qemu-ppc@nongnu.org, iii@linux.ibm.com, david@redhat.com, balaton@eik.bme.hu Subject: [PATCH 1/2] accel/tcg: Introduce memset_ra, memmove_ra Date: Tue, 2 Jul 2024 16:41:54 -0700 Message-Id: <20240702234155.2106399-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240702234155.2106399-1-richard.henderson@linaro.org> References: <20240702234155.2106399-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Add wrappers that set and clear helper_retaddr around the host memory operation. This cannot fail for system mode, but might raise SIGSEGV for user mode. Signed-off-by: Richard Henderson --- include/exec/cpu_ldst.h | 40 ++++++++++++++++++++++++++++++++++++++++ accel/tcg/user-exec.c | 22 ++++++++++++++++++++++ 2 files changed, 62 insertions(+) diff --git a/include/exec/cpu_ldst.h b/include/exec/cpu_ldst.h index 71009f84f5..baf4f9367d 100644 --- a/include/exec/cpu_ldst.h +++ b/include/exec/cpu_ldst.h @@ -379,4 +379,44 @@ void *tlb_vaddr_to_host(CPUArchState *env, abi_ptr addr, MMUAccessType access_type, int mmu_idx); #endif +/** + * memset_ra: + * @p: host pointer + * @c: data + * @n: length + * @ra: unwind return address + * + * Like system memset(p,c,n), except manages @ra for the calling + * helper in the event of a signal. To be used with the result + * of tlb_vaddr_to_host to resolve the host pointer. + */ +#ifdef CONFIG_USER_ONLY +void *memset_ra(void *p, int c, size_t n, uintptr_t ra); +#else +static inline void *memset_ra(void *p, int c, size_t n, uintptr_t ra) +{ + return memset(p, c, n); +} +#endif + +/** + * memmove_ra: + * @d: host destination pointer + * @s: host source pointer + * @n: length + * @ra: unwind return address + * + * Like system memmove(d,s,n), except manages @ra for the calling + * helper in the event of a signal. To be used with the result of + * tlb_vaddr_to_host to resolve the host pointer. + */ +#ifdef CONFIG_USER_ONLY +void *memmove_ra(void *d, const void *s, size_t n, uintptr_t ra); +#else +static inline void *memmove_ra(void *d, const void *s, size_t n, uintptr_t ra) +{ + return memmove(d, s, n); +} +#endif + #endif /* CPU_LDST_H */ diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index 80d24540ed..a73da42e3a 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -1289,3 +1289,25 @@ static void *atomic_mmu_lookup(CPUState *cpu, vaddr addr, MemOpIdx oi, #define DATA_SIZE 16 #include "atomic_template.h" #endif + +void *memset_ra(void *p, int c, size_t n, uintptr_t ra) +{ + void *r; + + set_helper_retaddr(ra); + r = memset(p, c, n); + clear_helper_retaddr(); + + return r; +} + +void *memmove_ra(void *d, const void *s, size_t n, uintptr_t ra) +{ + void *r; + + set_helper_retaddr(ra); + r = memmove(d, s, n); + clear_helper_retaddr(); + + return r; +}