target_ulong addr, target_ulong len);
#define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
+ssize_t softmmu_strlen_user(CPUArchState *env, target_ulong addr);
+#define target_strlen(p) softmmu_strlen_user(env, p)
+
#endif /* SEMIHOSTING_SOFTMMU_UACCESS_H */
*/
#include "qemu/osdep.h"
+#include "exec/exec-all.h"
#include "semihosting/softmmu-uaccess.h"
void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
return p;
}
+ssize_t softmmu_strlen_user(CPUArchState *env, target_ulong addr)
+{
+ int mmu_idx = cpu_mmu_index(env, false);
+ size_t len = 0;
+
+ while (1) {
+ size_t left_in_page;
+ int flags;
+ void *h;
+
+ /* Find the number of bytes remaining in the page. */
+ left_in_page = TARGET_PAGE_SIZE - (addr & ~TARGET_PAGE_MASK);
+
+ flags = probe_access_flags(env, addr, MMU_DATA_LOAD,
+ mmu_idx, true, &h, 0);
+ if (flags & TLB_INVALID_MASK) {
+ return -1;
+ }
+ if (flags & TLB_MMIO) {
+ do {
+ uint8_t c;
+ if (cpu_memory_rw_debug(env_cpu(env), addr, &c, 1, 0)) {
+ return -1;
+ }
+ if (c == 0) {
+ return len;
+ }
+ addr++;
+ len++;
+ if (len > INT32_MAX) {
+ return -1;
+ }
+ } while (--left_in_page != 0);
+ } else {
+ char *p = memchr(h, 0, left_in_page);
+ if (p) {
+ len += p - (char *)h;
+ return len <= INT32_MAX ? (ssize_t)len : -1;
+ }
+ addr += left_in_page;
+ len += left_in_page;
+ if (len > INT32_MAX) {
+ return -1;
+ }
+ }
+ }
+}
+
char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
{
/* TODO: Make this something that isn't fixed size. */