Update semihosting to v7.2.0

configs/targets/aarch64-linux-user.mak

@@ -2,4 +2,5 @@ TARGET_ARCH=aarch64
 TARGET_BASE_ARCH=arm
 TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml
 TARGET_HAS_BFLT=y
+CONFIG_SEMIHOSTING=y
 CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y

configs/targets/aarch64_be-linux-user.mak

@@ -3,4 +3,5 @@ TARGET_BASE_ARCH=arm
 TARGET_WORDS_BIGENDIAN=y
 TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml
 TARGET_HAS_BFLT=y
+CONFIG_SEMIHOSTING=y
 CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y

configs/targets/arm-linux-user.mak

@@ -3,4 +3,5 @@ TARGET_SYSTBL_ABI=common,oabi
 TARGET_SYSTBL=syscall.tbl
 TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml gdb-xml/arm-m-profile-mve.xml
 TARGET_HAS_BFLT=y
+CONFIG_SEMIHOSTING=y
 CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y

configs/targets/armeb-linux-user.mak

@@ -4,4 +4,5 @@ TARGET_SYSTBL=syscall.tbl
 TARGET_WORDS_BIGENDIAN=y
 TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml gdb-xml/arm-m-profile-mve.xml
 TARGET_HAS_BFLT=y
+CONFIG_SEMIHOSTING=y
 CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y

configs/targets/riscv32-linux-user.mak

@@ -2,4 +2,5 @@ TARGET_ARCH=riscv32
 TARGET_BASE_ARCH=riscv
 TARGET_ABI_DIR=riscv
 TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-virtual.xml
+CONFIG_SEMIHOSTING=y
 CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y

configs/targets/riscv64-linux-user.mak

@@ -2,4 +2,5 @@ TARGET_ARCH=riscv64
 TARGET_BASE_ARCH=riscv
 TARGET_ABI_DIR=riscv
 TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-virtual.xml
+CONFIG_SEMIHOSTING=y
 CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y

gdbstub.c

@@ -1863,11 +1863,12 @@ static void handle_read_all_regs(GArray *params, void *user_ctx)
 static void handle_file_io(GArray *params, void *user_ctx)
 {
     if (params->len >= 1 && gdbserver_state.current_syscall_cb) {
-        target_ulong ret, err;
+        uint64_t ret;
+        int err;
 
-        ret = (target_ulong)get_param(params, 0)->val_ull;
+        ret = get_param(params, 0)->val_ull;
         if (params->len >= 2) {
-            err = (target_ulong)get_param(params, 1)->val_ull;
+            err = get_param(params, 1)->val_ull;
         } else {
             err = 0;
         }

include/exec/gdbstub.h

@@ -10,11 +10,71 @@
 #define GDB_WATCHPOINT_READ      3
 #define GDB_WATCHPOINT_ACCESS    4
 
+/* For gdb file i/o remote protocol open flags. */
+#define GDB_O_RDONLY  0
+#define GDB_O_WRONLY  1
+#define GDB_O_RDWR    2
+#define GDB_O_APPEND  8
+#define GDB_O_CREAT   0x200
+#define GDB_O_TRUNC   0x400
+#define GDB_O_EXCL    0x800
+
+/* For gdb file i/o remote protocol errno values */
+#define GDB_EPERM           1
+#define GDB_ENOENT          2
+#define GDB_EINTR           4
+#define GDB_EBADF           9
+#define GDB_EACCES         13
+#define GDB_EFAULT         14
+#define GDB_EBUSY          16
+#define GDB_EEXIST         17
+#define GDB_ENODEV         19
+#define GDB_ENOTDIR        20
+#define GDB_EISDIR         21
+#define GDB_EINVAL         22
+#define GDB_ENFILE         23
+#define GDB_EMFILE         24
+#define GDB_EFBIG          27
+#define GDB_ENOSPC         28
+#define GDB_ESPIPE         29
+#define GDB_EROFS          30
+#define GDB_ENAMETOOLONG   91
+#define GDB_EUNKNOWN       9999
+
+/* For gdb file i/o remote protocol lseek whence. */
+#define GDB_SEEK_SET  0
+#define GDB_SEEK_CUR  1
+#define GDB_SEEK_END  2
+
+/* For gdb file i/o stat/fstat. */
+typedef uint32_t gdb_mode_t;
+typedef uint32_t gdb_time_t;
+
+struct gdb_stat {
+  uint32_t    gdb_st_dev;     /* device */
+  uint32_t    gdb_st_ino;     /* inode */
+  gdb_mode_t  gdb_st_mode;    /* protection */
+  uint32_t    gdb_st_nlink;   /* number of hard links */
+  uint32_t    gdb_st_uid;     /* user ID of owner */
+  uint32_t    gdb_st_gid;     /* group ID of owner */
+  uint32_t    gdb_st_rdev;    /* device type (if inode device) */
+  uint64_t    gdb_st_size;    /* total size, in bytes */
+  uint64_t    gdb_st_blksize; /* blocksize for filesystem I/O */
+  uint64_t    gdb_st_blocks;  /* number of blocks allocated */
+  gdb_time_t  gdb_st_atime;   /* time of last access */
+  gdb_time_t  gdb_st_mtime;   /* time of last modification */
+  gdb_time_t  gdb_st_ctime;   /* time of last change */
+} QEMU_PACKED;
+
+struct gdb_timeval {
+  gdb_time_t tv_sec;  /* second */
+  uint64_t tv_usec;   /* microsecond */
+} QEMU_PACKED;
+
 #ifdef NEED_CPU_H
 #include "cpu.h"
 
-typedef void (*gdb_syscall_complete_cb)(CPUState *cpu,
-                                        target_ulong ret, target_ulong err);
+typedef void (*gdb_syscall_complete_cb)(CPUState *cpu, uint64_t ret, int err);
 
 /**
  * gdb_do_syscall:

semihosting/common-semi.h → include/semihosting/common-semi.h

@@ -34,6 +34,6 @@
 #ifndef COMMON_SEMI_H
 #define COMMON_SEMI_H
 
-target_ulong do_common_semihosting(CPUState *cs);
+void do_common_semihosting(CPUState *cs);
 
 #endif /* COMMON_SEMI_H */

include/semihosting/console.h

@@ -12,58 +12,48 @@
 #include "cpu.h"
 
 /**
- * qemu_semihosting_console_outs:
- * @env: CPUArchState
- * @s: host address of null terminated guest string
+ * qemu_semihosting_console_read:
+ * @cs: CPUState
+ * @buf: host buffer
+ * @len: buffer size
  *
- * Send a null terminated guest string to the debug console. This may
- * be the remote gdb session if a softmmu guest is currently being
- * debugged.
+ * Receive at least one character from debug console.  As this call may
+ * block if no data is available we suspend the CPU and will re-execute the
+ * instruction when data is there. Therefore two conditions must be met:
  *
- * Returns: number of bytes written.
+ *   - CPUState is synchronized before calling this function
+ *   - pc is only updated once the character is successfully returned
+ *
+ * Returns: number of characters read, OR cpu_loop_exit!
  */
-int qemu_semihosting_console_outs(CPUArchState *env, target_ulong s);
+int qemu_semihosting_console_read(CPUState *cs, void *buf, int len);
 
 /**
- * qemu_semihosting_console_outc:
- * @env: CPUArchState
- * @s: host address of null terminated guest string
+ * qemu_semihosting_console_write:
+ * @buf: host buffer
+ * @len: buffer size
  *
- * Send single character from guest memory to the debug console. This
- * may be the remote gdb session if a softmmu guest is currently being
- * debugged.
+ * Write len bytes from buf to the debug console.
  *
- * Returns: nothing
+ * Returns: number of bytes written -- this should only ever be short
+ * on some sort of i/o error.
  */
-void qemu_semihosting_console_outc(CPUArchState *env, target_ulong c);
+int qemu_semihosting_console_write(void *buf, int len);
 
-/**
- * qemu_semihosting_console_inc:
- * @env: CPUArchState
- *
- * Receive single character from debug console. This may be the remote
- * gdb session if a softmmu guest is currently being debugged. As this
- * call may block if no data is available we suspend the CPU and will
- * re-execute the instruction when data is there. Therefore two
- * conditions must be met:
- *   - CPUState is synchronized before calling this function
- *   - pc is only updated once the character is successfully returned
+/*
+ * qemu_semihosting_console_block_until_ready:
+ * @cs: CPUState
  *
- * Returns: character read OR cpu_loop_exit!
+ * If no data is available we suspend the CPU and will re-execute the
+ * instruction when data is available.
  */
-target_ulong qemu_semihosting_console_inc(CPUArchState *env);
+void qemu_semihosting_console_block_until_ready(CPUState *cs);
 
 /**
- * qemu_semihosting_log_out:
- * @s: pointer to string
- * @len: length of string
- *
- * Send a string to the debug output. Unlike console_out these strings
- * can't be sent to a remote gdb instance as they don't exist in guest
- * memory.
+ * qemu_semihosting_console_ready:
  *
- * Returns: number of bytes written
+ * Return true if characters are available for read; does not block.
  */
-int qemu_semihosting_log_out(const char *s, int len);
+bool qemu_semihosting_console_ready(void);
 
 #endif /* SEMIHOST_CONSOLE_H */

include/semihosting/guestfd.h

@@ -0,0 +1,91 @@
+/*
+ * Hosted file support for semihosting syscalls.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Copyright © 2020 by Keith Packard <[email protected]>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef SEMIHOSTING_GUESTFD_H
+#define SEMIHOSTING_GUESTFD_H
+
+typedef enum GuestFDType {
+    GuestFDUnused = 0,
+    GuestFDHost,
+    GuestFDGDB,
+    GuestFDStatic,
+    GuestFDConsole,
+} GuestFDType;
+
+/*
+ * Guest file descriptors are integer indexes into an array of
+ * these structures (we will dynamically resize as necessary).
+ */
+typedef struct GuestFD {
+    GuestFDType type;
+    union {
+        int hostfd;
+        struct {
+            const uint8_t *data;
+            size_t len;
+            size_t off;
+        } staticfile;
+    };
+} GuestFD;
+
+/*
+ * For ARM semihosting, we have a separate structure for routing
+ * data for the console which is outside the guest fd address space.
+ */
+extern GuestFD console_in_gf;
+extern GuestFD console_out_gf;
+
+/**
+ * alloc_guestfd:
+ *
+ * Allocate an unused GuestFD index.  The associated guestfd index
+ * will still be GuestFDUnused until it is initialized.
+ */
+int alloc_guestfd(void);
+
+/**
+ * dealloc_guestfd:
+ * @guestfd: GuestFD index
+ *
+ * Deallocate a GuestFD index.  The associated GuestFD structure
+ * will be recycled for a subsequent allocation.
+ */
+void dealloc_guestfd(int guestfd);
+
+/**
+ * get_guestfd:
+ * @guestfd: GuestFD index
+ *
+ * Return the GuestFD structure associated with an initialized @guestfd,
+ * or NULL if it has not been allocated, or hasn't been initialized.
+ */
+GuestFD *get_guestfd(int guestfd);
+
+/**
+ * associate_guestfd:
+ * @guestfd: GuestFD index
+ * @hostfd: host file descriptor
+ *
+ * Initialize the GuestFD for @guestfd to GuestFDHost using @hostfd.
+ */
+void associate_guestfd(int guestfd, int hostfd);
+
+/**
+ * staticfile_guestfd:
+ * @guestfd: GuestFD index
+ * @data: data to be read
+ * @len: length of @data
+ *
+ * Initialize the GuestFD for @guestfd to GuestFDStatic.
+ * The @len bytes at @data will be returned to the guest on reads.
+ */
+void staticfile_guestfd(int guestfd, const uint8_t *data, size_t len);
+
+#endif /* SEMIHOSTING_GUESTFD_H */

include/semihosting/semihost.h

@@ -27,7 +27,7 @@ typedef enum SemihostingTarget {
 } SemihostingTarget;
 
 #ifdef CONFIG_USER_ONLY
-static inline bool semihosting_enabled(void)
+static inline bool semihosting_enabled(bool is_user)
 {
     return true;
 }
@@ -51,27 +51,25 @@ static inline const char *semihosting_get_cmdline(void)
 {
     return NULL;
 }
-
-static inline Chardev *semihosting_get_chardev(void)
-{
-    return NULL;
-}
-static inline void qemu_semihosting_console_init(void)
-{
-}
 #else /* !CONFIG_USER_ONLY */
-bool semihosting_enabled(void);
+/**
+ * semihosting_enabled:
+ * @is_user: true if guest code is in usermode (i.e. not privileged)
+ *
+ * Return true if guest code is allowed to make semihosting calls.
+ */
+bool semihosting_enabled(bool is_user);
 SemihostingTarget semihosting_get_target(void);
 const char *semihosting_get_arg(int i);
 int semihosting_get_argc(void);
 const char *semihosting_get_cmdline(void);
 void semihosting_arg_fallback(const char *file, const char *cmd);
-Chardev *semihosting_get_chardev(void);
 /* for vl.c hooks */
 void qemu_semihosting_enable(void);
 int qemu_semihosting_config_options(const char *opt);
-void qemu_semihosting_connect_chardevs(void);
-void qemu_semihosting_console_init(void);
+void qemu_semihosting_chardev_init(void);
+void qemu_semihosting_console_init(Chardev *);
 #endif /* CONFIG_USER_ONLY */
+void qemu_semihosting_guestfd_init(void);
 
 #endif /* SEMIHOST_H */