further semihosting support

libwrap/semihosting/semihosting.c

@@ -2,6 +2,7 @@
 #include <stdarg.h>
 #include <stddef.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "semihosting.h"
 
@@ -33,7 +34,7 @@
 
 #define RISCV_SEMIHOSTING_CALL_NUMBER 7
 
-/*typedef struct {
+typedef struct {
     char* str;
     int mode;
     size_t length;
@@ -48,9 +49,13 @@ typedef struct {
 
 typedef struct {
     char* path;
-    int len;
+    size_t len;
 } RemoveVector;
-*/
+
+typedef struct{
+    int fd;
+    off_t pos;
+} SeekVector;
 
 static inline int __attribute__ ((always_inline)) call_host(int reason, void* arg) {
 #if 1
@@ -86,17 +91,22 @@ static inline int __attribute__ ((always_inline)) call_host(int reason, void* ar
 #endif    
 }
 
-/*
 int sh_errno(void) {
     return call_host(SEMIHOSTING_SYS_ERRNO, (void*)NULL);
 }
 
 int sh_time(void) {
     return call_host(SEMIHOSTING_SYS_TIME, (void*)NULL);
-} 
+}
 
-void sh_seek(int file_handle, int pos) {
-    int vec[2] = {file_handle, pos};
+int sh_remove(char* path) {
+    size_t len = strlen(path);
+    RemoveVector vec = {path, len};
+    return call_host(SEMIHOSTING_SYS_REMOVE, &vec);
+}
+
+void sh_seek(int file_handle, off_t pos) {
+    SeekVector vec = {file_handle, pos};
     call_host(SEMIHOSTING_SYS_SEEK, &vec);
     return;
 }
@@ -135,13 +145,12 @@ int sh_iserror(int num) {
 int sh_istty(int file_handle) {
     return call_host(SEMIHOSTING_SYS_ISTTY, file_handle);
 }
-
+/*
 int sh_remove(char* path) {
-    int len = strlen(path);
+    size_t len = strlen(path);
     RemoveVector vec = {path, len};
     return call_host(SEMIHOSTING_SYS_REMOVE, &vec);
-
-}
+}*/
 
 void sh_rename(char* old, char* new) {
     int old_len = strlen(old);
@@ -175,18 +184,22 @@ int sh_open(char* str, int mode) {
     //int length = 44;
     size_t length = strlen(str);
     OpenVector vec = {str, mode, length};
-    int i = call_host(SEMIHOSTING_SYS_OPEN, &vec);
-    return i;
+    return call_host(SEMIHOSTING_SYS_OPEN, &vec);
 }
 
 void sh_read(char* buf, int file_handle, size_t length) {
     OpenVector vec = {buf, file_handle, length};
     int i = call_host(SEMIHOSTING_SYS_READ, &vec);
     return i;
-} */
+} 
 
 int sh_clock(void)
 {
     int clock = call_host(SEMIHOSTING_SYS_CLOCK, (void*)NULL);
     return clock;
-}
+}
+
+/*
+void sh_write(char* str, int file_handle) {
+    return;
+}*/

libwrap/semihosting/semihosting.h

@@ -1,8 +1,11 @@
 #ifndef SEMIHOSTING_H
 #define SEMIHOSTING_H
 
+#include <unistd.h>
+#include <sys/types.h>
 //int32_t trace_write(const char* buf, uint32_t nbyte);
 
+void sh_seek(int, off_t);
 void sh_write0(const char* buf);
 void sh_writec(char c);
 char sh_readc(void);