Drop support for semihosting

We don't use semihosting in any of our test configs at the moment so
there's a risk this code might get broken without us notifying it.
It seems better to reintroduce it if and when we actually need it.

Change-Id: Iae84e3be034cc3da0248954aa5a1029ddd50aabb
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>

3 files changed, 0 insertions, 242 deletions

diff --git a/lib/semihosting/aarch32/semihosting_call.S b/lib/semihosting/aarch32/semihosting_call.S
deleted file mode 100644
index fe489b6..0000000
--- a/lib/semihosting/aarch32/semihosting_call.S
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * Copyright (c) 2018, Arm Limited. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <asm_macros.S>
-
-	.globl	semihosting_call
-
-func semihosting_call
-	svc	#0x123456
-	bx	lr
-endfunc semihosting_call
diff --git a/lib/semihosting/aarch64/semihosting_call.S b/lib/semihosting/aarch64/semihosting_call.S
deleted file mode 100644
index dfded2e..0000000
--- a/lib/semihosting/aarch64/semihosting_call.S
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * Copyright (c) 2018, Arm Limited. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <asm_macros.S>
-
-	.globl	semihosting_call
-
-func semihosting_call
-	hlt	#0xf000
-	ret
-endfunc semihosting_call
diff --git a/lib/semihosting/semihosting.c b/lib/semihosting/semihosting.c
deleted file mode 100644
index cf10802..0000000
--- a/lib/semihosting/semihosting.c
+++ /dev/null
@@ -1,214 +0,0 @@
-/*
- * Copyright (c) 2018, Arm Limited. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <assert.h>
-#include <errno.h>
-#include <semihosting.h>
-#include <string.h>
-
-#ifndef SEMIHOSTING_SUPPORTED
-#define SEMIHOSTING_SUPPORTED  1
-#endif
-
-long semihosting_call(unsigned long operation,
-			void *system_block_address);
-
-typedef struct {
-	const char *file_name;
-	unsigned long mode;
-	size_t name_length;
-} smh_file_open_block_t;
-
-typedef struct {
-	long handle;
-	uintptr_t buffer;
-	size_t length;
-} smh_file_read_write_block_t;
-
-typedef struct {
-	long handle;
-	ssize_t location;
-} smh_file_seek_block_t;
-
-typedef struct {
-	char *command_line;
-	size_t command_length;
-} smh_system_block_t;
-
-long semihosting_connection_supported(void)
-{
-	return SEMIHOSTING_SUPPORTED;
-}
-
-long semihosting_file_open(const char *file_name, size_t mode)
-{
-	smh_file_open_block_t open_block;
-
-	open_block.file_name = file_name;
-	open_block.mode = mode;
-	open_block.name_length = strlen(file_name);
-
-	return semihosting_call(SEMIHOSTING_SYS_OPEN,
-				(void *) &open_block);
-}
-
-long semihosting_file_seek(long file_handle, ssize_t offset)
-{
-	smh_file_seek_block_t seek_block;
-	long result;
-
-	seek_block.handle = file_handle;
-	seek_block.location = offset;
-
-	result = semihosting_call(SEMIHOSTING_SYS_SEEK,
-				  (void *) &seek_block);
-
-	if (result)
-		result = semihosting_call(SEMIHOSTING_SYS_ERRNO, 0);
-
-	return result;
-}
-
-long semihosting_file_read(long file_handle, size_t *length, uintptr_t buffer)
-{
-	smh_file_read_write_block_t read_block;
-	long result = -EINVAL;
-
-	if ((length == NULL) || (buffer == (uintptr_t)NULL))
-		return result;
-
-	read_block.handle = file_handle;
-	read_block.buffer = buffer;
-	read_block.length = *length;
-
-	result = semihosting_call(SEMIHOSTING_SYS_READ,
-				  (void *) &read_block);
-
-	if (result == *length) {
-		return -EINVAL;
-	} else if (result < *length) {
-		*length -= result;
-		return 0;
-	} else
-		return result;
-}
-
-long semihosting_file_write(long file_handle,
-			    size_t *length,
-			    const uintptr_t buffer)
-{
-	smh_file_read_write_block_t write_block;
-
-	if ((length == NULL) || (buffer == (uintptr_t)NULL))
-		return -EINVAL;
-
-	write_block.handle = file_handle;
-	write_block.buffer = (uintptr_t)buffer; /* cast away const */
-	write_block.length = *length;
-
-	*length = semihosting_call(SEMIHOSTING_SYS_WRITE,
-				   (void *) &write_block);
-
-	return *length;
-}
-
-long semihosting_file_close(long file_handle)
-{
-	return semihosting_call(SEMIHOSTING_SYS_CLOSE,
-				(void *) &file_handle);
-}
-
-long semihosting_file_length(long file_handle)
-{
-	return semihosting_call(SEMIHOSTING_SYS_FLEN,
-				(void *) &file_handle);
-}
-
-char semihosting_read_char(void)
-{
-	return semihosting_call(SEMIHOSTING_SYS_READC, NULL);
-}
-
-void semihosting_write_char(char character)
-{
-	semihosting_call(SEMIHOSTING_SYS_WRITEC, (void *) &character);
-}
-
-void semihosting_write_string(char *string)
-{
-	semihosting_call(SEMIHOSTING_SYS_WRITE0, (void *) string);
-}
-
-long semihosting_system(char *command_line)
-{
-	smh_system_block_t system_block;
-
-	system_block.command_line = command_line;
-	system_block.command_length = strlen(command_line);
-
-	return semihosting_call(SEMIHOSTING_SYS_SYSTEM,
-				(void *) &system_block);
-}
-
-long semihosting_get_flen(const char *file_name)
-{
-	long file_handle;
-	size_t length;
-
-	assert(semihosting_connection_supported());
-
-	file_handle = semihosting_file_open(file_name, FOPEN_MODE_RB);
-	if (file_handle == -1)
-		return file_handle;
-
-	/* Find the length of the file */
-	length = semihosting_file_length(file_handle);
-
-	return semihosting_file_close(file_handle) ? -1 : length;
-}
-
-long semihosting_download_file(const char *file_name,
-			      size_t buf_size,
-			      uintptr_t buf)
-{
-	long ret = -EINVAL;
-	size_t length;
-	long file_handle;
-
-	/* Null pointer check */
-	if (!buf)
-		return ret;
-
-	assert(semihosting_connection_supported());
-
-	file_handle = semihosting_file_open(file_name, FOPEN_MODE_RB);
-	if (file_handle == -1)
-		return ret;
-
-	/* Find the actual length of the file */
-	length = semihosting_file_length(file_handle);
-	if (length == -1)
-		goto semihosting_fail;
-
-	/* Signal error if we do not have enough space for the file */
-	if (length > buf_size)
-		goto semihosting_fail;
-
-	/*
-	 * A successful read will return 0 in which case we pass back
-	 * the actual number of bytes read. Else we pass a negative
-	 * value indicating an error.
-	 */
-	ret = semihosting_file_read(file_handle, &length, buf);
-	if (ret)
-		goto semihosting_fail;
-	else
-		ret = length;
-
-semihosting_fail:
-	semihosting_file_close(file_handle);
-	return ret;
-}