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gdbstub: move syscall handling to new file

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Our GDB syscall support is the last chunk of code that needs target
specific support so move it to a new file. We take the opportunity to
move the syscall state into its own singleton instance and add in a
few helpers for the main gdbstub to interact with the module.

I also moved the gdb_exit() declaration into syscalls.h as it feels
pretty related and most of the callers of it treat it as such.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Message-Id: <20230302190846.2593720-22-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-22-richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2023-03-02 18:57:57 -08:00
parent 4ea5fe997d
commit c566080cd3
17 changed files with 387 additions and 288 deletions
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102
include/exec/gdbstub.h
View file

@ -10,98 +10,6 @@
#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;
typedef void (*gdb_syscall_complete_cb)(CPUState *cpu, uint64_t ret, int err);
/**
* gdb_do_syscall:
* @cb: function to call when the system call has completed
* @fmt: gdb syscall format string
* ...: list of arguments to interpolate into @fmt
*
* Send a GDB syscall request. This function will return immediately;
* the callback function will be called later when the remote system
* call has completed.
*
* @fmt should be in the 'call-id,parameter,parameter...' format documented
* for the F request packet in the GDB remote protocol. A limited set of
* printf-style format specifiers is supported:
* %x - target_ulong argument printed in hex
* %lx - 64-bit argument printed in hex
* %s - string pointer (target_ulong) and length (int) pair
*/
void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...);
/**
* gdb_do_syscallv:
* @cb: function to call when the system call has completed
* @fmt: gdb syscall format string
* @va: arguments to interpolate into @fmt
*
* As gdb_do_syscall, but taking a va_list rather than a variable
* argument list.
*/
void gdb_do_syscallv(gdb_syscall_complete_cb cb, const char *fmt, va_list va);
int use_gdb_syscalls(void);
/* Get or set a register. Returns the size of the register. */
typedef int (*gdb_get_reg_cb)(CPUArchState *env, GByteArray *buf, int reg);
@ -120,16 +28,6 @@ void gdb_register_coprocessor(CPUState *cpu,
*/
int gdbserver_start(const char *port_or_device);
/**
* gdb_exit: exit gdb session, reporting inferior status
* @code: exit code reported
*
* This closes the session and sends a final packet to GDB reporting
* the exit status of the program. It also cleans up any connections
* detritus before returning.
*/
void gdb_exit(int code);
void gdb_set_stop_cpu(CPUState *cpu);
/**