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semihosting: Create semihost_sys_gettimeofday

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This syscall will be used by m68k and nios2 semihosting.

Reviewed-by: Luc Michel <lmichel@kalray.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-04-29 16:05:49 -07:00
parent dffeb77566
commit 1875dab0ee
2 changed files with 45 additions and 0 deletions
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3
include/semihosting/syscalls.h
View file

@ -66,4 +66,7 @@ void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete,
void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong cmd, target_ulong cmd_len);
void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong tv_addr, target_ulong tz_addr);
#endif /* SEMIHOSTING_SYSCALLS_H */

42
semihosting/syscalls.c
View file

@ -236,6 +236,12 @@ static void gdb_system(CPUState *cs, gdb_syscall_complete_cb complete,
gdb_do_syscall(complete, "system,%s", cmd, len);
}
static void gdb_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong tv_addr, target_ulong tz_addr)
{
gdb_do_syscall(complete, "gettimeofday,%x,%x", tv_addr, tz_addr);
}
/*
* Host semihosting syscall implementations.
*/
@ -487,6 +493,32 @@ static void host_system(CPUState *cs, gdb_syscall_complete_cb complete,
unlock_user(p, cmd, 0);
}
static void host_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong tv_addr, target_ulong tz_addr)
{
CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
struct gdb_timeval *p;
int64_t rt;
/* GDB fails on non-null TZ, so be consistent. */
if (tz_addr != 0) {
complete(cs, -1, EINVAL);
return;
}
p = lock_user(VERIFY_WRITE, tv_addr, sizeof(struct gdb_timeval), 0);
if (!p) {
complete(cs, -1, EFAULT);
return;
}
/* TODO: Like stat, gdb always produces big-endian results; match it. */
rt = g_get_real_time();
p->tv_sec = cpu_to_be32(rt / G_USEC_PER_SEC);
p->tv_usec = cpu_to_be64(rt % G_USEC_PER_SEC);
unlock_user(p, tv_addr, sizeof(struct gdb_timeval));
}
/*
* Static file semihosting syscall implementations.
*/
@ -796,3 +828,13 @@ void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
host_system(cs, complete, cmd, cmd_len);
}
}
void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong tv_addr, target_ulong tz_addr)
{
if (use_gdb_syscalls()) {
gdb_gettimeofday(cs, complete, tv_addr, tz_addr);
} else {
host_gettimeofday(cs, complete, tv_addr, tz_addr);
}
}