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/*
* Copyright (c) 2012 Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of Linaro Limited nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*/
#include <inttypes.h>
#include <string.h>
#include "semihosting.h"
int semi_open(char const *filename, int mode)
{
struct {
char const *filename;
intptr_t mode;
intptr_t filename_length;
} args;
args.filename = filename;
args.mode = mode;
args.filename_length = strlen(filename);
return __semi_call(SYS_OPEN, &args);
}
int semi_close(int fd)
{
struct {
intptr_t fd;
} args;
args.fd = fd;
return __semi_call(SYS_CLOSE, &args);
}
int semi_write0(char const *string)
{
return __semi_call(SYS_WRITE0, string);
}
void semi_writec(char c)
{
__semi_call(SYS_WRITEC, &c);
}
int semi_read(int fd, char *buffer, int length)
{
struct {
intptr_t fd;
char *buffer;
intptr_t length;
} args;
args.fd = fd;
args.buffer = buffer;
args.length = length;
return __semi_call(SYS_READ, &args);
}
int semi_write(int fd, const char *buffer, int length)
{
struct {
intptr_t fd;
const char *buffer;
intptr_t length;
} args;
args.fd = fd;
args.buffer = buffer;
args.length = length;
return __semi_call(SYS_WRITE, &args);
}
int semi_flen(int fd)
{
struct {
intptr_t fd;
} args;
args.fd = fd;
return __semi_call(SYS_FLEN, &args);
}
int semi_istty(int fd)
{
struct {
intptr_t fd;
} args;
args.fd = fd;
return __semi_call(SYS_ISTTY, &args);
}
int semi_seek(int fd, intptr_t pos)
{
struct {
intptr_t fd;
intptr_t pos;
} args;
args.fd = fd;
args.pos = pos;
return __semi_call(SYS_SEEK, &args);
}
int semi_remove(const char *filename)
{
struct {
const char *filename;
intptr_t flen;
} args;
args.filename = filename;
args.flen = strlen(filename);
return __semi_call(SYS_REMOVE, &args);
}
int semi_get_cmdline(char *buffer, int size, int *length)
{
int result;
struct {
char *buffer;
intptr_t size;
} args;
args.buffer = buffer;
args.size = size;
result = __semi_call(SYS_GET_CMDLINE, &args);
if(result)
return result;
if(length)
*length = args.size;
return 0;
}
int semi_reportexc(int reason, int subcode)
{
#ifdef __aarch64__
/* The A64 interface to this call takes an arg block,
* whereas the A32/T32 interface just takes the reason
* code in a register.
*/
struct {
intptr_t reason;
intptr_t subcode;
} args;
args.reason = reason;
args.subcode = subcode;
return __semi_call(SYS_REPORTEXC, &args);
#else
return __semi_call(SYS_REPORTEXC, (void *)reason);
#endif
}
void semi_exit(int subcode)
{
semi_reportexc(REPORTEXC_REASON_APP_EXIT, subcode);
while(1); /* should not be reached */
}
void semi_exit_extended(int subcode)
{
/* If present, this always allows a subcode to be reported. */
struct {
intptr_t reason;
intptr_t subcode;
} args;
args.reason = REPORTEXC_REASON_APP_EXIT;
args.subcode = subcode;
__semi_call(SYS_EXIT_EXTENDED, &args);
while(1); /* should not be reached */
}
void semi_fatal(char const *message)
{
semi_write0(message);
semi_exit(1);
}
int semi_load_file(void **dest, unsigned *size, char const *filename)
{
int result = -1; /* fail by default */
int fd = -1;
int filesize;
fd = semi_open(filename, OPEN_RDONLY);
if(fd == -1) {
semi_write0("Cannot open file: ");
goto out;
}
filesize = semi_flen(fd);
if(filesize == -1) {
semi_write0("Cannot get file size for: ");
goto out;
}
if (*size < filesize) {
semi_write0("File too big for buffer: ");
goto out;
}
if(semi_read(fd, *dest, filesize)) {
semi_write0("Could not read: ");
goto out;
}
result = 0; /* success */
*dest = (char *)*dest + filesize;
out:
if(fd != -1)
semi_close(fd);
if(result) { /* print context for the error message */
semi_write0(filename);
semi_write0("\n");
} else {
*size = filesize;
}
return result;
}
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