[PATCH v3 05/12] xtensa: Bring in semihosting headers and config options
Jiaxun Yang
jiaxun.yang at flygoat.com
Tue Jun 18 15:56:05 CEST 2024
They are all directly imported from Linux kernel.
Reviewed-by: Max Filippov <jcmvbkbc at gmail.com>
Tested-by: Max Filippov <jcmvbkbc at gmail.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang at flygoat.com>
---
arch/xtensa/Kconfig | 27 ++++++
arch/xtensa/include/asm/platform/simcall-gdbio.h | 34 +++++++
arch/xtensa/include/asm/platform/simcall-iss.h | 73 +++++++++++++++
arch/xtensa/include/asm/platform/simcall.h | 110 +++++++++++++++++++++++
4 files changed, 244 insertions(+)
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 8f668cc67ed0..4afd56bca095 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -41,6 +41,33 @@ config SPL_SYS_DCACHE_OFF
help
Do not enable data cache in SPL.
+config XTENSA_SEMIHOSTING
+ bool "Support semihosting"
+ help
+ Enable Xtensa semihosting debugging support.
+
+choice
+ prompt "Semihosting interface"
+ default XTENSA_SIMCALL_ISS
+ depends on XTENSA_SEMIHOSTING
+ help
+ Choose semihosting interface that will be used for serial port,
+ block device and networking.
+
+config XTENSA_SIMCALL_ISS
+ bool "simcall"
+ help
+ Use simcall instruction. simcall is only available on simulators,
+ it does nothing on hardware.
+
+config XTENSA_SIMCALL_GDBIO
+ bool "GDBIO"
+ help
+ Use break instruction. It is available on real hardware when GDB
+ is attached to it via JTAG.
+
+endchoice
+
source "board/cadence/xtfpga/Kconfig"
endmenu
diff --git a/arch/xtensa/include/asm/platform/simcall-gdbio.h b/arch/xtensa/include/asm/platform/simcall-gdbio.h
new file mode 100644
index 000000000000..e642860e25a8
--- /dev/null
+++ b/arch/xtensa/include/asm/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/include/asm/platform/simcall-iss.h b/arch/xtensa/include/asm/platform/simcall-iss.h
new file mode 100644
index 000000000000..5a1e7a1f182e
--- /dev/null
+++ b/arch/xtensa/include/asm/platform/simcall-iss.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021 Cadence Design Systems Inc. */
+
+#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H
+#define _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H
+
+/*
+ * System call like services offered by the simulator host.
+ */
+
+#define SYS_nop 0 /* unused */
+#define SYS_exit 1 /*x*/
+#define SYS_fork 2
+#define SYS_read 3 /*x*/
+#define SYS_write 4 /*x*/
+#define SYS_open 5 /*x*/
+#define SYS_close 6 /*x*/
+#define SYS_rename 7 /*x 38 - waitpid */
+#define SYS_creat 8 /*x*/
+#define SYS_link 9 /*x (not implemented on WIN32) */
+#define SYS_unlink 10 /*x*/
+#define SYS_execv 11 /* n/a - execve */
+#define SYS_execve 12 /* 11 - chdir */
+#define SYS_pipe 13 /* 42 - time */
+#define SYS_stat 14 /* 106 - mknod */
+#define SYS_chmod 15
+#define SYS_chown 16 /* 202 - lchown */
+#define SYS_utime 17 /* 30 - break */
+#define SYS_wait 18 /* n/a - oldstat */
+#define SYS_lseek 19 /*x*/
+#define SYS_getpid 20
+#define SYS_isatty 21 /* n/a - mount */
+#define SYS_fstat 22 /* 108 - oldumount */
+#define SYS_time 23 /* 13 - setuid */
+#define SYS_gettimeofday 24 /*x 78 - getuid (not implemented on WIN32) */
+#define SYS_times 25 /*X 43 - stime (Xtensa-specific implementation) */
+#define SYS_socket 26
+#define SYS_sendto 27
+#define SYS_recvfrom 28
+#define SYS_select_one 29 /* not compatible select, one file descriptor at the time */
+#define SYS_bind 30
+#define SYS_ioctl 31
+
+#define SYS_iss_argc 1000 /* returns value of argc */
+#define SYS_iss_argv_size 1001 /* bytes needed for argv & arg strings */
+#define SYS_iss_set_argv 1002 /* saves argv & arg strings at given addr */
+
+/*
+ * SYS_select_one specifiers
+ */
+
+#define XTISS_SELECT_ONE_READ 1
+#define XTISS_SELECT_ONE_WRITE 2
+#define XTISS_SELECT_ONE_EXCEPT 3
+
+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("a3") = b;
+ register int c1 asm("a4") = c;
+ register int d1 asm("a5") = d;
+ __asm__ __volatile__ (
+ "simcall\n"
+ : "+r"(a1), "+r"(b1)
+ : "r"(c1), "r"(d1)
+ : "memory");
+ errno = b1;
+ return a1;
+}
+
+#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H */
diff --git a/arch/xtensa/include/asm/platform/simcall.h b/arch/xtensa/include/asm/platform/simcall.h
new file mode 100644
index 000000000000..a1cb269e68f0
--- /dev/null
+++ b/arch/xtensa/include/asm/platform/simcall.h
@@ -0,0 +1,110 @@
+/*
+ * include/asm-xtensa/platform-iss/simcall.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 Tensilica Inc.
+ * Copyright (C) 2017 - 2021 Cadence Design Systems Inc.
+ */
+
+#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_H
+#define _XTENSA_PLATFORM_ISS_SIMCALL_H
+
+#include <linux/bug.h>
+
+#ifdef CONFIG_XTENSA_SIMCALL_ISS
+#include <asm/platform/simcall-iss.h>
+#endif
+#ifdef CONFIG_XTENSA_SIMCALL_GDBIO
+#include <asm/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)
+{
+ return __simc(SYS_open, (int) file, flags, mode);
+}
+
+static inline int simc_close(int fd)
+{
+ return __simc(SYS_close, fd, 0, 0);
+}
+
+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)
+{
+ return __simc(SYS_read, fd, (int) buf, count);
+}
+
+static inline int simc_write(int fd, const void *buf, size_t count)
+{
+ return __simc(SYS_write, fd, (int) buf, 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)
+{
+ return __simc(SYS_lseek, fd, off, 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 */
--
2.43.0
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