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sim: syscall: add common sim_syscall helpers

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Many ports have the same sim syscall logic, so add some helpers to handle
all the common details.  The arches still have to deal with the unpacking
and packing of the syscall arguments, but the rest of the sim<->callback
glue is now shared.
This commit is contained in:
Mike Frysinger
2015-06-15 19:22:38 +05:45
parent 61a0c964e6
commit 7d5c6c43ca
15 changed files with 193 additions and 167 deletions
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28
sim/lm32/traps.c
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@@ -132,26 +132,18 @@ lm32bf_scall_insn (SIM_CPU * current_cpu, IADDR pc)
|| (GET_H_GR (8) == TARGET_SYS_exit))
{
/* Delegate system call to host O/S. */
CB_SYSCALL s;
CB_SYSCALL_INIT (&s);
s.p1 = (PTR) sd;
s.p2 = (PTR) current_cpu;
s.read_mem = sim_syscall_read_mem;
s.write_mem = sim_syscall_write_mem;
/* Extract parameters. */
s.func = GET_H_GR (8);
s.arg1 = GET_H_GR (1);
s.arg2 = GET_H_GR (2);
s.arg3 = GET_H_GR (3);
/* Halt the simulator if the requested system call is _exit. */
if (s.func == TARGET_SYS_exit)
sim_engine_halt (sd, current_cpu, NULL, pc, sim_exited, s.arg1);
long result, result2;
int errcode;
/* Perform the system call. */
cb_syscall (cb, &s);
sim_syscall_multi (current_cpu, GET_H_GR (8), GET_H_GR (1), GET_H_GR (2),
GET_H_GR (3), GET_H_GR (4), &result, &result2,
&errcode);
/* Store the return value in the CPU's registers. */
SET_H_GR (1, s.result);
SET_H_GR (2, s.result2);
SET_H_GR (3, s.errcode);
SET_H_GR (1, result);
SET_H_GR (2, result2);
SET_H_GR (3, errcode);
/* Skip over scall instruction. */
return pc + 4;
}