xtensa: Bring in semihosting headers and config options
They are all directly imported from Linux kernel.
Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
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 0000000..5a1e7a1
--- /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 */