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implement printf syscall wrapper for linux

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wenyongh
2019-05-15 14:32:35 +08:00
parent a595ec79ab
commit 40e7c627aa
3 changed files with 29 additions and 16 deletions
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39
core/iwasm/runtime/platform/linux/wasm-native.c
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@ -109,31 +109,44 @@ __syscall3_wrapper(int32 arg0, int32 arg1, int32 arg2, int32 arg3)
return syscall(54, arg1, arg2, wsz);
}
case 145: /* readv */
case 146: /* writev */
{
/* Implement syscall 54 and syscall 146 to support printf()
for non SIDE_MODULE=1 mode */
uint32 iovcnt = arg3, i;
struct iovec *vec_begin, *vec;
struct iovec_app {
int32 iov_base_offset;
uint32 iov_len;
} *vec;
int32 vec_offset = arg2, str_offset;
uint32 iov_count = arg3, i;
int32 count = 0;
char *iov_base, *str;
if (!validate_app_addr(arg2, sizeof(struct iovec)))
if (!validate_app_addr(vec_offset, sizeof(struct iovec_app)))
return 0;
vec_begin = vec = (struct iovec*)addr_app_to_native(arg2);
for (i = 0; i < iovcnt; i++, vec++) {
vec = (struct iovec_app *)addr_app_to_native(vec_offset);
for (i = 0; i < iov_count; i++, vec++) {
if (vec->iov_len > 0) {
if (!validate_app_addr((int32)vec->iov_base, 1))
if (!validate_app_addr(vec->iov_base_offset, 1))
return 0;
vec->iov_base = addr_app_to_native((int32)vec->iov_base);
iov_base = (char*)addr_app_to_native(vec->iov_base_offset);
if (!(str_offset = module_malloc(vec->iov_len + 1)))
return 0;
str = addr_app_to_native(str_offset);
memcpy(str, iov_base, vec->iov_len);
str[vec->iov_len] = '\0';
count += wasm_printf("%s", str);
module_free(str_offset);
}
}
if (arg0 == 145)
return syscall(145, arg1, vec_begin, arg3);
else
return syscall(146, arg1, vec_begin, arg3);
return count;
}
case 145: /* readv */
case 3: /* read*/
case 5: /* open */
case 221: /* fcntl */