From 0baf907b718e1602383b973de7822c25db4c4a36 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Mon, 28 Apr 2025 10:16:52 -0700 Subject: [PATCH] accel/tcg: Split out accel/tcg/helper-retaddr.h MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Move set_helper_retaddr and clear_helper_retaddr to a new header file. Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Pierrick Bouvier Signed-off-by: Richard Henderson --- accel/tcg/cpu-exec.c | 1 + accel/tcg/user-exec.c | 1 + include/accel/tcg/cpu-ldst.h | 34 ----------------------- include/accel/tcg/helper-retaddr.h | 43 ++++++++++++++++++++++++++++++ target/arm/tcg/helper-a64.c | 1 + target/arm/tcg/sme_helper.c | 1 + target/arm/tcg/sve_helper.c | 1 + target/ppc/mem_helper.c | 1 + target/s390x/tcg/mem_helper.c | 1 + 9 files changed, 50 insertions(+), 34 deletions(-) create mode 100644 include/accel/tcg/helper-retaddr.h diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index a7436d28732..a8fbda31ba5 100644 --- a/accel/tcg/cpu-exec.c +++ b/accel/tcg/cpu-exec.c @@ -24,6 +24,7 @@ #include "hw/core/cpu.h" #include "accel/tcg/cpu-ldst.h" #include "accel/tcg/cpu-ops.h" +#include "accel/tcg/helper-retaddr.h" #include "trace.h" #include "disas/disas.h" #include "exec/cpu-common.h" diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index 70feee8df99..68e01fc584f 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -26,6 +26,7 @@ #include "qemu/bitops.h" #include "qemu/rcu.h" #include "accel/tcg/cpu-ldst.h" +#include "accel/tcg/helper-retaddr.h" #include "accel/tcg/probe.h" #include "user/cpu_loop.h" #include "qemu/main-loop.h" diff --git a/include/accel/tcg/cpu-ldst.h b/include/accel/tcg/cpu-ldst.h index f97a730703e..44a62b54dae 100644 --- a/include/accel/tcg/cpu-ldst.h +++ b/include/accel/tcg/cpu-ldst.h @@ -526,38 +526,4 @@ void *tlb_vaddr_to_host(CPUArchState *env, vaddr addr, MMUAccessType access_type, int mmu_idx); #endif -/* - * For user-only, helpers that use guest to host address translation - * must protect the actual host memory access by recording 'retaddr' - * for the signal handler. This is required for a race condition in - * which another thread unmaps the page between a probe and the - * actual access. - */ -#ifdef CONFIG_USER_ONLY -extern __thread uintptr_t helper_retaddr; - -static inline void set_helper_retaddr(uintptr_t ra) -{ - helper_retaddr = ra; - /* - * Ensure that this write is visible to the SIGSEGV handler that - * may be invoked due to a subsequent invalid memory operation. - */ - signal_barrier(); -} - -static inline void clear_helper_retaddr(void) -{ - /* - * Ensure that previous memory operations have succeeded before - * removing the data visible to the signal handler. - */ - signal_barrier(); - helper_retaddr = 0; -} -#else -#define set_helper_retaddr(ra) do { } while (0) -#define clear_helper_retaddr() do { } while (0) -#endif - #endif /* ACCEL_TCG_CPU_LDST_H */ diff --git a/include/accel/tcg/helper-retaddr.h b/include/accel/tcg/helper-retaddr.h new file mode 100644 index 00000000000..037fda2b83d --- /dev/null +++ b/include/accel/tcg/helper-retaddr.h @@ -0,0 +1,43 @@ +/* + * Get user helper pc for memory unwinding. + * SPDX-License-Identifier: LGPL-2.1-or-later + */ + +#ifndef ACCEL_TCG_HELPER_RETADDR_H +#define ACCEL_TCG_HELPER_RETADDR_H + +/* + * For user-only, helpers that use guest to host address translation + * must protect the actual host memory access by recording 'retaddr' + * for the signal handler. This is required for a race condition in + * which another thread unmaps the page between a probe and the + * actual access. + */ +#ifdef CONFIG_USER_ONLY +extern __thread uintptr_t helper_retaddr; + +static inline void set_helper_retaddr(uintptr_t ra) +{ + helper_retaddr = ra; + /* + * Ensure that this write is visible to the SIGSEGV handler that + * may be invoked due to a subsequent invalid memory operation. + */ + signal_barrier(); +} + +static inline void clear_helper_retaddr(void) +{ + /* + * Ensure that previous memory operations have succeeded before + * removing the data visible to the signal handler. + */ + signal_barrier(); + helper_retaddr = 0; +} +#else +#define set_helper_retaddr(ra) do { } while (0) +#define clear_helper_retaddr() do { } while (0) +#endif + +#endif /* ACCEL_TCG_HELPER_RETADDR_H */ diff --git a/target/arm/tcg/helper-a64.c b/target/arm/tcg/helper-a64.c index 9cffda07cd7..4f618ae390e 100644 --- a/target/arm/tcg/helper-a64.c +++ b/target/arm/tcg/helper-a64.c @@ -30,6 +30,7 @@ #include "qemu/crc32c.h" #include "exec/cpu-common.h" #include "accel/tcg/cpu-ldst.h" +#include "accel/tcg/helper-retaddr.h" #include "accel/tcg/probe.h" #include "exec/target_page.h" #include "exec/tlb-flags.h" diff --git a/target/arm/tcg/sme_helper.c b/target/arm/tcg/sme_helper.c index 3226895cae3..de0c6e54d4b 100644 --- a/target/arm/tcg/sme_helper.c +++ b/target/arm/tcg/sme_helper.c @@ -23,6 +23,7 @@ #include "tcg/tcg-gvec-desc.h" #include "exec/helper-proto.h" #include "accel/tcg/cpu-ldst.h" +#include "accel/tcg/helper-retaddr.h" #include "qemu/int128.h" #include "fpu/softfloat.h" #include "vec_internal.h" diff --git a/target/arm/tcg/sve_helper.c b/target/arm/tcg/sve_helper.c index 9f20ecb51d3..a2c363a4e17 100644 --- a/target/arm/tcg/sve_helper.c +++ b/target/arm/tcg/sve_helper.c @@ -30,6 +30,7 @@ #include "vec_internal.h" #include "sve_ldst_internal.h" #include "accel/tcg/cpu-ldst.h" +#include "accel/tcg/helper-retaddr.h" #include "accel/tcg/cpu-ops.h" #include "accel/tcg/probe.h" #ifdef CONFIG_USER_ONLY diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c index aa1af44d22a..6ab71a6fcb4 100644 --- a/target/ppc/mem_helper.c +++ b/target/ppc/mem_helper.c @@ -24,6 +24,7 @@ #include "exec/helper-proto.h" #include "helper_regs.h" #include "accel/tcg/cpu-ldst.h" +#include "accel/tcg/helper-retaddr.h" #include "accel/tcg/probe.h" #include "internal.h" #include "qemu/atomic128.h" diff --git a/target/s390x/tcg/mem_helper.c b/target/s390x/tcg/mem_helper.c index 857005b1202..a03609a1406 100644 --- a/target/s390x/tcg/mem_helper.c +++ b/target/s390x/tcg/mem_helper.c @@ -32,6 +32,7 @@ #include "exec/target_page.h" #include "exec/tlb-flags.h" #include "accel/tcg/cpu-ops.h" +#include "accel/tcg/helper-retaddr.h" #include "qemu/int128.h" #include "qemu/atomic128.h" -- 2.47.2