#include "sim-base.h"
#include "sim-options.h"
-#ifndef NUM_ELEM
-#define NUM_ELEM(A) (sizeof (A) / sizeof (A)[0])
-#endif
-
#define target_big_endian (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN)
cpu.gr[PARM4] = cpu.gr[0];
}
-/* Functions so that trapped open/close don't interfere with the
- parent's functions. We say that we can't close the descriptors
- that we didn't open. exit() and cleanup() get in trouble here,
- to some extent. That's the price of emulation. */
+/* Read/write functions for system call interface. */
-unsigned char opened[100];
-
-static void
-log_open (int fd)
-{
- if (fd < 0 || fd > NUM_ELEM (opened))
- return;
-
- opened[fd] = 1;
-}
-
-static void
-log_close (int fd)
+static int
+syscall_read_mem (host_callback *cb, struct cb_syscall *sc,
+ unsigned long taddr, char *buf, int bytes)
{
- if (fd < 0 || fd > NUM_ELEM (opened))
- return;
-
- opened[fd] = 0;
+ memcpy (buf, cpu.mem + taddr, bytes);
+ return bytes;
}
static int
-is_opened (int fd)
+syscall_write_mem (host_callback *cb, struct cb_syscall *sc,
+ unsigned long taddr, const char *buf, int bytes)
{
- if (fd < 0 || fd > NUM_ELEM (opened))
- return 0;
-
- return opened[fd];
+ memcpy (cpu.mem + taddr, buf, bytes);
+ return bytes;
}
+/* Simulate a monitor trap. */
+
static void
handle_trap1 (SIM_DESC sd)
{
- unsigned long a[3];
- host_callback *callback = STATE_CALLBACK (sd);
-
- switch ((unsigned long) (cpu.gr [TRAPCODE]))
- {
- case 3:
- a[0] = (unsigned long) (cpu.gr[PARM1]);
- a[1] = (unsigned long) (cpu.mem + cpu.gr[PARM2]);
- a[2] = (unsigned long) (cpu.gr[PARM3]);
- cpu.gr[RET1] = callback->read (callback, a[0], (char *) a[1], a[2]);
- break;
-
- case 4:
- a[0] = (unsigned long) (cpu.gr[PARM1]);
- a[1] = (unsigned long) (cpu.mem + cpu.gr[PARM2]);
- a[2] = (unsigned long) (cpu.gr[PARM3]);
- cpu.gr[RET1] = (int)callback->write (callback, a[0], (char *) a[1], a[2]);
- break;
-
- case 5:
- a[0] = (unsigned long) (cpu.mem + cpu.gr[PARM1]);
- a[1] = (unsigned long) (cpu.gr[PARM2]);
- /* a[2] = (unsigned long) (cpu.gr[PARM3]); */
- cpu.gr[RET1] = callback->open (callback, (char *) a[0], a[1]);
- log_open (cpu.gr[RET1]);
- break;
-
- case 6:
- a[0] = (unsigned long) (cpu.gr[PARM1]);
- /* Watch out for debugger's files. */
- if (is_opened (a[0]))
- {
- log_close (a[0]);
- cpu.gr[RET1] = callback->close (callback, a[0]);
- }
- else
- {
- /* Don't let him close it. */
- cpu.gr[RET1] = (-1);
- }
- break;
+ host_callback *cb = STATE_CALLBACK (sd);
+ CB_SYSCALL sc;
- case 9:
- a[0] = (unsigned long) (cpu.mem + cpu.gr[PARM1]);
- a[1] = (unsigned long) (cpu.mem + cpu.gr[PARM2]);
- cpu.gr[RET1] = link ((char *) a[0], (char *) a[1]);
- break;
+ CB_SYSCALL_INIT (&sc);
- case 10:
- a[0] = (unsigned long) (cpu.mem + cpu.gr[PARM1]);
- cpu.gr[RET1] = callback->unlink (callback, (char *) a[0]);
- break;
+ sc.func = cpu.gr[TRAPCODE];
+ sc.arg1 = cpu.gr[PARM1];
+ sc.arg2 = cpu.gr[PARM2];
+ sc.arg3 = cpu.gr[PARM3];
+ sc.arg4 = cpu.gr[PARM4];
- case 13:
- /* handle time(0) vs time(&var) */
- a[0] = (unsigned long) (cpu.gr[PARM1]);
- if (a[0])
- a[0] += (unsigned long) cpu.mem;
- cpu.gr[RET1] = callback->time (callback, (time_t *) a[0]);
- break;
+ sc.p1 = (PTR) sd;
+ sc.p2 = (PTR) STATE_CPU (sd, 0);
+ sc.read_mem = syscall_read_mem;
+ sc.write_mem = syscall_write_mem;
- case 19:
- a[0] = (unsigned long) (cpu.gr[PARM1]);
- a[1] = (unsigned long) (cpu.gr[PARM2]);
- a[2] = (unsigned long) (cpu.gr[PARM3]);
- cpu.gr[RET1] = callback->lseek (callback, a[0], a[1], a[2]);
- break;
-
- case 33:
- a[0] = (unsigned long) (cpu.mem + cpu.gr[PARM1]);
- a[1] = (unsigned long) (cpu.gr[PARM2]);
- cpu.gr[RET1] = access ((char *) a[0], a[1]);
- break;
-
- case 43:
- a[0] = (unsigned long) (cpu.mem + cpu.gr[PARM1]);
-#if 0
- cpu.gr[RET1] = times ((char *)a[0]);
-#else
- {
- /* Give him simulated cycles for utime
- and an instruction count for stime. */
- struct tms
- {
- time_t tms_utime;
- time_t tms_stime;
- time_t tms_cutime;
- time_t tms_cstime;
- } t;
+ cb_syscall (cb, &sc);
- t.tms_utime = cpu.asregs.cycles;
- t.tms_stime = cpu.asregs.insts;
- t.tms_cutime = t.tms_utime;
- t.tms_cstime = t.tms_stime;
-
- memcpy ((struct tms *)(a[0]), &t, sizeof (t));
-
- cpu.gr[RET1] = cpu.asregs.cycles;
- }
-#endif
- break;
-
- case 69:
- /* Historically this was sbrk(), but no one used it, and the
- implementation didn't actually work, so it's a stub now. */
- a[0] = (unsigned long) (cpu.gr[PARM1]);
- cpu.gr[RET1] = -1;
- break;
-
- default:
- if (issue_messages)
- fprintf (stderr, "WARNING: sys call %d unimplemented\n",
- cpu.gr[TRAPCODE]);
- break;
- }
+ /* XXX: We don't pass back the actual errno value. */
+ cpu.gr[RET1] = sc.result;
}
static void
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