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semihosting: Split out semihost_sys_flen

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The ARM-specific SYS_FLEN isn't really something that can be
reused by other semihosting apis, but there are parts that can
reused for the implementation of semihost_sys_fstat.

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 09:05:36 -07:00
parent a221247430
commit a6300ed6b7
3 changed files with 66 additions and 61 deletions
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49
semihosting/syscalls.c
View file

@ -127,6 +127,12 @@ static void gdb_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
gdb_do_syscall(complete, "isatty,%x", (target_ulong)gf->hostfd);
}
static void gdb_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, target_ulong addr)
{
gdb_do_syscall(complete, "fstat,%x,%x", (target_ulong)gf->hostfd, addr);
}
/*
* Host semihosting syscall implementations.
*/
@ -259,6 +265,18 @@ static void host_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
complete(cs, ret, ret ? 0 : errno);
}
static void host_flen(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
struct stat buf;
if (fstat(gf->hostfd, &buf) < 0) {
complete(cs, -1, errno);
} else {
complete(cs, buf.st_size, 0);
}
}
/*
* Static file semihosting syscall implementations.
*/
@ -311,6 +329,12 @@ static void staticfile_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
}
}
static void staticfile_flen(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
complete(cs, gf->staticfile.len, 0);
}
/*
* Syscall entry points.
*/
@ -473,3 +497,28 @@ void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete, int fd)
g_assert_not_reached();
}
}
void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb,
gdb_syscall_complete_cb flen_cb, int fd,
target_ulong fstat_addr)
{
GuestFD *gf = get_guestfd(fd);
if (!gf) {
flen_cb(cs, -1, EBADF);
return;
}
switch (gf->type) {
case GuestFDGDB:
gdb_fstat(cs, fstat_cb, gf, fstat_addr);
break;
case GuestFDHost:
host_flen(cs, flen_cb, gf);
break;
case GuestFDStatic:
staticfile_flen(cs, flen_cb, gf);
break;
default:
g_assert_not_reached();
}
}