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semihosting: Split out semihost_sys_lseek

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

Expand the internal type of the offset to int64_t, and
provide the whence argument, which will be required by
m68k and nios2 semihosting.

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 12:04:44 -07:00
parent 40f1219a8b
commit 9a89470449
4 changed files with 102 additions and 38 deletions
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3
include/semihosting/syscalls.h
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@ -39,4 +39,7 @@ void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
void semihost_sys_write_gf(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, target_ulong buf, target_ulong len);
void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, int64_t off, int gdb_whence);
#endif /* SEMIHOSTING_SYSCALLS_H */