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authorMax Filippov <jcmvbkbc@gmail.com>2021-02-18 21:18:00 +0300
committerMax Filippov <jcmvbkbc@gmail.com>2021-04-05 01:39:04 +0300
commit6a8eb99e130f3f7658de2776934374fe1c41279e (patch)
tree8ef3f342e36752553f900d6783a83d2d3cfe8454 /arch/xtensa/platforms/iss
parent54467c126b19230f4d722b67ed7ae5807ed8f5ce (diff)
downloadlinux-6a8eb99e130f3f7658de2776934374fe1c41279e.tar.xz
xtensa: ISS: add GDBIO implementation to semihosting interface
Add GDBIO implementation for the xtensa semihosting interface. It offers less functions than the simcall interface, so make some semihosting functions optional and return error when implementation is not available. Add Kconfig menu to select semihosting implementation and add simcall and GDBIO choices there. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/platforms/iss')
-rw-r--r--arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h34
-rw-r--r--arch/xtensa/platforms/iss/include/platform/simcall.h36
2 files changed, 70 insertions, 0 deletions
diff --git a/arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h b/arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h
new file mode 100644
index 000000000000..e642860e25a8
--- /dev/null
+++ b/arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021 Cadence Design Systems Inc. */
+
+#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H
+#define _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H
+
+/*
+ * System call like services offered by the GDBIO host.
+ */
+
+#define SYS_open -2
+#define SYS_close -3
+#define SYS_read -4
+#define SYS_write -5
+#define SYS_lseek -6
+
+static int errno;
+
+static inline int __simc(int a, int b, int c, int d)
+{
+ register int a1 asm("a2") = a;
+ register int b1 asm("a6") = b;
+ register int c1 asm("a3") = c;
+ register int d1 asm("a4") = d;
+ __asm__ __volatile__ (
+ "break 1, 14\n"
+ : "+r"(a1), "+r"(c1)
+ : "r"(b1), "r"(d1)
+ : "memory");
+ errno = c1;
+ return a1;
+}
+
+#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H */
diff --git a/arch/xtensa/platforms/iss/include/platform/simcall.h b/arch/xtensa/platforms/iss/include/platform/simcall.h
index 612080bf0b3d..e1ec50ce39ee 100644
--- a/arch/xtensa/platforms/iss/include/platform/simcall.h
+++ b/arch/xtensa/platforms/iss/include/platform/simcall.h
@@ -12,11 +12,23 @@
#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_H
#define _XTENSA_PLATFORM_ISS_SIMCALL_H
+#include <linux/bug.h>
+
+#ifdef CONFIG_XTENSA_SIMCALL_ISS
#include <platform/simcall-iss.h>
+#endif
+#ifdef CONFIG_XTENSA_SIMCALL_GDBIO
+#include <platform/simcall-gdbio.h>
+#endif
static inline int simc_exit(int exit_code)
{
+#ifdef SYS_exit
return __simc(SYS_exit, exit_code, 0, 0);
+#else
+ WARN_ONCE(1, "%s: not implemented\n", __func__);
+ return -1;
+#endif
}
static inline int simc_open(const char *file, int flags, int mode)
@@ -31,7 +43,12 @@ static inline int simc_close(int fd)
static inline int simc_ioctl(int fd, int request, void *arg)
{
+#ifdef SYS_ioctl
return __simc(SYS_ioctl, fd, request, (int) arg);
+#else
+ WARN_ONCE(1, "%s: not implemented\n", __func__);
+ return -1;
+#endif
}
static inline int simc_read(int fd, void *buf, size_t count)
@@ -46,9 +63,14 @@ static inline int simc_write(int fd, const void *buf, size_t count)
static inline int simc_poll(int fd)
{
+#ifdef SYS_select_one
long timeval[2] = { 0, 0 };
return __simc(SYS_select_one, fd, XTISS_SELECT_ONE_READ, (int)&timeval);
+#else
+ WARN_ONCE(1, "%s: not implemented\n", __func__);
+ return -1;
+#endif
}
static inline int simc_lseek(int fd, uint32_t off, int whence)
@@ -58,17 +80,31 @@ static inline int simc_lseek(int fd, uint32_t off, int whence)
static inline int simc_argc(void)
{
+#ifdef SYS_iss_argc
return __simc(SYS_iss_argc, 0, 0, 0);
+#else
+ WARN_ONCE(1, "%s: not implemented\n", __func__);
+ return 0;
+#endif
}
static inline int simc_argv_size(void)
{
+#ifdef SYS_iss_argv_size
return __simc(SYS_iss_argv_size, 0, 0, 0);
+#else
+ WARN_ONCE(1, "%s: not implemented\n", __func__);
+ return 0;
+#endif
}
static inline void simc_argv(void *buf)
{
+#ifdef SYS_iss_set_argv
__simc(SYS_iss_set_argv, (int)buf, 0, 0);
+#else
+ WARN_ONCE(1, "%s: not implemented\n", __func__);
+#endif
}
#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_H */