f14eced5ac
Add a check in 'softmmu-uaccess.h' that the header is only include in system emulation, and rename it as 'uaccess.h'. Rename the API methods: - softmmu_[un]lock_user*() -> uaccess_[un]lock_user*() - softmmu_strlen_user() -> uaccess_strlen_user(). Update a pair of comments. Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-ID: <20231004090629.37473-9-philmd@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/*
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* Helper routines to provide target memory access for semihosting
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* syscalls in system emulation mode.
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*
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* Copyright (c) 2007 CodeSourcery.
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*
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* This code is licensed under the GPL
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*/
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#include "qemu/osdep.h"
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#include "exec/exec-all.h"
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#include "semihosting/uaccess.h"
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void *uaccess_lock_user(CPUArchState *env, target_ulong addr,
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target_ulong len, bool copy)
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{
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void *p = malloc(len);
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if (p && copy) {
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if (cpu_memory_rw_debug(env_cpu(env), addr, p, len, 0)) {
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free(p);
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p = NULL;
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}
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}
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return p;
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}
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ssize_t uaccess_strlen_user(CPUArchState *env, target_ulong addr)
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{
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int mmu_idx = cpu_mmu_index(env, false);
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size_t len = 0;
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while (1) {
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size_t left_in_page;
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int flags;
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void *h;
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/* Find the number of bytes remaining in the page. */
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left_in_page = TARGET_PAGE_SIZE - (addr & ~TARGET_PAGE_MASK);
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flags = probe_access_flags(env, addr, 0, MMU_DATA_LOAD,
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mmu_idx, true, &h, 0);
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if (flags & TLB_INVALID_MASK) {
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return -1;
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}
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if (flags & TLB_MMIO) {
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do {
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uint8_t c;
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if (cpu_memory_rw_debug(env_cpu(env), addr, &c, 1, 0)) {
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return -1;
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}
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if (c == 0) {
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return len;
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}
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addr++;
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len++;
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if (len > INT32_MAX) {
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return -1;
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}
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} while (--left_in_page != 0);
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} else {
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char *p = memchr(h, 0, left_in_page);
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if (p) {
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len += p - (char *)h;
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return len <= INT32_MAX ? (ssize_t)len : -1;
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}
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addr += left_in_page;
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len += left_in_page;
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if (len > INT32_MAX) {
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return -1;
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}
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}
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}
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}
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char *uaccess_lock_user_string(CPUArchState *env, target_ulong addr)
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{
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ssize_t len = uaccess_strlen_user(env, addr);
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if (len < 0) {
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return NULL;
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}
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return uaccess_lock_user(env, addr, len + 1, true);
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}
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void uaccess_unlock_user(CPUArchState *env, void *p,
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target_ulong addr, target_ulong len)
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{
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if (len) {
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cpu_memory_rw_debug(env_cpu(env), addr, p, len, 1);
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}
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free(p);
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}
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