From: Philippe Mathieu-Daudé Date: Mon, 17 Feb 2025 11:13:16 +0000 (+0100) Subject: accel/tcg: Move cpu_memory_rw_debug() user implementation to user-exec.c X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=585d4b122914b7be170eef147a0269cc233f0adc;p=qemu.git accel/tcg: Move cpu_memory_rw_debug() user implementation to user-exec.c cpu_memory_rw_debug() system implementation is defined in system/physmem.c. Move the user one to accel/tcg/user-exec.c to simplify cpu-target.c maintenance. Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Richard Henderson Message-Id: <20250217130610.18313-6-philmd@linaro.org> --- diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index 9d53c9440e..2322181b15 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -19,6 +19,7 @@ #include "qemu/osdep.h" #include "accel/tcg/cpu-ops.h" #include "disas/disas.h" +#include "exec/vaddr.h" #include "exec/exec-all.h" #include "tcg/tcg.h" #include "qemu/bitops.h" @@ -971,6 +972,85 @@ static void *cpu_mmu_lookup(CPUState *cpu, vaddr addr, return ret; } +/* physical memory access (slow version, mainly for debug) */ +int cpu_memory_rw_debug(CPUState *cpu, vaddr addr, + void *ptr, size_t len, bool is_write) +{ + int flags; + vaddr l, page; + uint8_t *buf = ptr; + ssize_t written; + int ret = -1; + int fd = -1; + + mmap_lock(); + + while (len > 0) { + page = addr & TARGET_PAGE_MASK; + l = (page + TARGET_PAGE_SIZE) - addr; + if (l > len) { + l = len; + } + flags = page_get_flags(page); + if (!(flags & PAGE_VALID)) { + goto out_close; + } + if (is_write) { + if (flags & PAGE_WRITE) { + memcpy(g2h(cpu, addr), buf, l); + } else { + /* Bypass the host page protection using ptrace. */ + if (fd == -1) { + fd = open("/proc/self/mem", O_WRONLY); + if (fd == -1) { + goto out; + } + } + /* + * If there is a TranslationBlock and we weren't bypassing the + * host page protection, the memcpy() above would SEGV, + * ultimately leading to page_unprotect(). So invalidate the + * translations manually. Both invalidation and pwrite() must + * be under mmap_lock() in order to prevent the creation of + * another TranslationBlock in between. + */ + tb_invalidate_phys_range(addr, addr + l - 1); + written = pwrite(fd, buf, l, + (off_t)(uintptr_t)g2h_untagged(addr)); + if (written != l) { + goto out_close; + } + } + } else if (flags & PAGE_READ) { + memcpy(buf, g2h(cpu, addr), l); + } else { + /* Bypass the host page protection using ptrace. */ + if (fd == -1) { + fd = open("/proc/self/mem", O_RDONLY); + if (fd == -1) { + goto out; + } + } + if (pread(fd, buf, l, + (off_t)(uintptr_t)g2h_untagged(addr)) != l) { + goto out_close; + } + } + len -= l; + buf += l; + addr += l; + } + ret = 0; +out_close: + if (fd != -1) { + close(fd); + } +out: + mmap_unlock(); + + return ret; +} + #include "ldst_atomicity.c.inc" static uint8_t do_ld1_mmu(CPUState *cpu, vaddr addr, MemOpIdx oi, diff --git a/cpu-target.c b/cpu-target.c index 3892ce1222..83688f1d50 100644 --- a/cpu-target.c +++ b/cpu-target.c @@ -19,18 +19,12 @@ #include "qemu/osdep.h" #include "qapi/error.h" - -#include "exec/target_page.h" -#include "exec/page-protection.h" #include "hw/qdev-core.h" #include "hw/qdev-properties.h" #include "qemu/error-report.h" #include "qemu/qemu-print.h" #include "migration/vmstate.h" -#ifdef CONFIG_USER_ONLY -#include "qemu.h" -#include "user/page-protection.h" -#else +#ifndef CONFIG_USER_ONLY #include "hw/core/sysemu-cpu-ops.h" #include "exec/address-spaces.h" #include "exec/memory.h" @@ -43,11 +37,11 @@ #include "exec/cpu-common.h" #include "exec/exec-all.h" #include "exec/tb-flush.h" -#include "exec/translation-block.h" #include "exec/log.h" #include "accel/accel-cpu-target.h" #include "trace/trace-root.h" #include "qemu/accel.h" +#include "hw/core/cpu.h" #ifndef CONFIG_USER_ONLY static int cpu_common_post_load(void *opaque, int version_id) @@ -367,86 +361,6 @@ void cpu_abort(CPUState *cpu, const char *fmt, ...) abort(); } -/* physical memory access (slow version, mainly for debug) */ -#if defined(CONFIG_USER_ONLY) -int cpu_memory_rw_debug(CPUState *cpu, vaddr addr, - void *ptr, size_t len, bool is_write) -{ - int flags; - vaddr l, page; - uint8_t *buf = ptr; - ssize_t written; - int ret = -1; - int fd = -1; - - mmap_lock(); - - while (len > 0) { - page = addr & TARGET_PAGE_MASK; - l = (page + TARGET_PAGE_SIZE) - addr; - if (l > len) - l = len; - flags = page_get_flags(page); - if (!(flags & PAGE_VALID)) { - goto out_close; - } - if (is_write) { - if (flags & PAGE_WRITE) { - memcpy(g2h(cpu, addr), buf, l); - } else { - /* Bypass the host page protection using ptrace. */ - if (fd == -1) { - fd = open("/proc/self/mem", O_WRONLY); - if (fd == -1) { - goto out; - } - } - /* - * If there is a TranslationBlock and we weren't bypassing the - * host page protection, the memcpy() above would SEGV, - * ultimately leading to page_unprotect(). So invalidate the - * translations manually. Both invalidation and pwrite() must - * be under mmap_lock() in order to prevent the creation of - * another TranslationBlock in between. - */ - tb_invalidate_phys_range(addr, addr + l - 1); - written = pwrite(fd, buf, l, - (off_t)(uintptr_t)g2h_untagged(addr)); - if (written != l) { - goto out_close; - } - } - } else if (flags & PAGE_READ) { - memcpy(buf, g2h(cpu, addr), l); - } else { - /* Bypass the host page protection using ptrace. */ - if (fd == -1) { - fd = open("/proc/self/mem", O_RDONLY); - if (fd == -1) { - goto out; - } - } - if (pread(fd, buf, l, - (off_t)(uintptr_t)g2h_untagged(addr)) != l) { - goto out_close; - } - } - len -= l; - buf += l; - addr += l; - } - ret = 0; -out_close: - if (fd != -1) { - close(fd); - } -out: - mmap_unlock(); - - return ret; -} -#endif - bool target_words_bigendian(void) { return TARGET_BIG_ENDIAN;