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semihosting: Split out semihost_sys_read

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Split out the non-ARM specific portions of SYS_READ to a
reusable function.  This handles all GuestFD.  Isolate the
curious ARM-specific return value processing to a new
callback, common_semi_rw_cb.

Note that gdb_do_syscall %x reads target_ulong, not int.

Reviewed-by: Luc Michel <lmichel@kalray.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-04-28 11:40:41 -07:00
parent 5eadbbfca6
commit af0484b502
3 changed files with 113 additions and 65 deletions
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8
include/semihosting/syscalls.h
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@ -18,6 +18,8 @@
* or non-zero (where it should include the terminating zero).
*/
typedef struct GuestFD GuestFD;
void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong fname, target_ulong fname_len,
int gdb_flags, int mode);
@ -25,4 +27,10 @@ void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete,
void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete,
int fd);
void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, target_ulong buf, target_ulong len);
void semihost_sys_read_gf(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, target_ulong buf, target_ulong len);
#endif /* SEMIHOSTING_SYSCALLS_H */