lib: Add common semihosting library
We factor out the arch-independent parts of the ARM semihosting
implementation as a common library so that it can be shared
with RISC-V.
Signed-off-by: Kautuk Consul <kconsul@ventanamicro.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/arch/arm/lib/semihosting.c b/arch/arm/lib/semihosting.c
index 939c0f7..7b7669b 100644
--- a/arch/arm/lib/semihosting.c
+++ b/arch/arm/lib/semihosting.c
@@ -5,20 +5,6 @@
*/
#include <common.h>
-#include <log.h>
-#include <semihosting.h>
-
-#define SYSOPEN 0x01
-#define SYSCLOSE 0x02
-#define SYSWRITEC 0x03
-#define SYSWRITE0 0x04
-#define SYSWRITE 0x05
-#define SYSREAD 0x06
-#define SYSREADC 0x07
-#define SYSISERROR 0x08
-#define SYSSEEK 0x0A
-#define SYSFLEN 0x0C
-#define SYSERRNO 0x13
/*
* Macro to force the compiler to *populate* memory (for an array or struct)
@@ -39,7 +25,7 @@
/*
* Call the handler
*/
-static long smh_trap(unsigned int sysnum, void *addr)
+long smh_trap(unsigned int sysnum, void *addr)
{
register long result asm("r0");
register void *_addr asm("r1") = addr;
@@ -59,168 +45,3 @@
return result;
}
-
-#if CONFIG_IS_ENABLED(SEMIHOSTING_FALLBACK)
-static bool _semihosting_enabled = true;
-static bool try_semihosting = true;
-
-bool semihosting_enabled(void)
-{
- if (try_semihosting) {
- smh_trap(SYSERRNO, NULL);
- try_semihosting = false;
- }
-
- return _semihosting_enabled;
-}
-
-void disable_semihosting(void)
-{
- _semihosting_enabled = false;
-}
-#endif
-
-/**
- * smh_errno() - Read the host's errno
- *
- * This gets the value of the host's errno and negates it. The host's errno may
- * or may not be set, so only call this function if a previous semihosting call
- * has failed.
- *
- * Return: a negative error value
- */
-static int smh_errno(void)
-{
- long ret = smh_trap(SYSERRNO, NULL);
-
- if (ret > 0 && ret < INT_MAX)
- return -ret;
- return -EIO;
-}
-
-long smh_open(const char *fname, enum smh_open_mode mode)
-{
- long fd;
- struct smh_open_s {
- const char *fname;
- unsigned long mode;
- size_t len;
- } open;
-
- debug("%s: file \'%s\', mode \'%u\'\n", __func__, fname, mode);
-
- open.fname = fname;
- open.len = strlen(fname);
- open.mode = mode;
-
- /* Open the file on the host */
- fd = smh_trap(SYSOPEN, &open);
- if (fd == -1)
- return smh_errno();
- return fd;
-}
-
-/**
- * struct smg_rdwr_s - Arguments for read and write
- * @fd: A file descriptor returned from smh_open()
- * @memp: Pointer to a buffer of memory of at least @len bytes
- * @len: The number of bytes to read or write
- */
-struct smh_rdwr_s {
- long fd;
- void *memp;
- size_t len;
-};
-
-long smh_read(long fd, void *memp, size_t len)
-{
- long ret;
- struct smh_rdwr_s read;
-
- debug("%s: fd %ld, memp %p, len %zu\n", __func__, fd, memp, len);
-
- read.fd = fd;
- read.memp = memp;
- read.len = len;
-
- ret = smh_trap(SYSREAD, &read);
- if (ret < 0)
- return smh_errno();
- return len - ret;
-}
-
-long smh_write(long fd, const void *memp, size_t len, ulong *written)
-{
- long ret;
- struct smh_rdwr_s write;
-
- debug("%s: fd %ld, memp %p, len %zu\n", __func__, fd, memp, len);
-
- write.fd = fd;
- write.memp = (void *)memp;
- write.len = len;
-
- ret = smh_trap(SYSWRITE, &write);
- *written = len - ret;
- if (ret)
- return smh_errno();
- return 0;
-}
-
-long smh_close(long fd)
-{
- long ret;
-
- debug("%s: fd %ld\n", __func__, fd);
-
- ret = smh_trap(SYSCLOSE, &fd);
- if (ret == -1)
- return smh_errno();
- return 0;
-}
-
-long smh_flen(long fd)
-{
- long ret;
-
- debug("%s: fd %ld\n", __func__, fd);
-
- ret = smh_trap(SYSFLEN, &fd);
- if (ret == -1)
- return smh_errno();
- return ret;
-}
-
-long smh_seek(long fd, long pos)
-{
- long ret;
- struct smh_seek_s {
- long fd;
- long pos;
- } seek;
-
- debug("%s: fd %ld pos %ld\n", __func__, fd, pos);
-
- seek.fd = fd;
- seek.pos = pos;
-
- ret = smh_trap(SYSSEEK, &seek);
- if (ret)
- return smh_errno();
- return 0;
-}
-
-int smh_getc(void)
-{
- return smh_trap(SYSREADC, NULL);
-}
-
-void smh_putc(char ch)
-{
- smh_trap(SYSWRITEC, &ch);
-}
-
-void smh_puts(const char *s)
-{
- smh_trap(SYSWRITE0, (char *)s);
-}