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semihosting: Add target_strlen for softmmu-uaccess.h
Mirror the interface of the user-only function of the same name. Use probe_access_flags for the common case of ram, and cpu_memory_rw_debug for the uncommon case of mmio. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- v3: Use probe_access_flags (pmm)
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@ -53,4 +53,7 @@ void softmmu_unlock_user(CPUArchState *env, void *p,
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target_ulong addr, target_ulong len);
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#define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
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ssize_t softmmu_strlen_user(CPUArchState *env, target_ulong addr);
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#define target_strlen(p) softmmu_strlen_user(env, p)
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#endif /* SEMIHOSTING_SOFTMMU_UACCESS_H */
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@ -8,6 +8,7 @@
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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/softmmu-uaccess.h"
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void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
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@ -23,6 +24,54 @@ void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
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return p;
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}
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ssize_t softmmu_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, 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 *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
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{
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/* TODO: Make this something that isn't fixed size. */
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