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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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62
sim/msp430/msp430-sim.c
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@@ -1022,62 +1022,14 @@ maybe_perform_syscall (SIM_DESC sd, int call_addr)
{
/* Syscall! */
int syscall_num = call_addr & 0x3f;
host_callback *cb = STATE_CALLBACK (sd);
CB_SYSCALL sc;
int arg1 = MSP430_CPU (sd)->state.regs[12];
int arg2 = MSP430_CPU (sd)->state.regs[13];
int arg3 = MSP430_CPU (sd)->state.regs[14];
int arg4 = MSP430_CPU (sd)->state.regs[15];
CB_SYSCALL_INIT (&sc);
sc.func = syscall_num;
sc.arg1 = MSP430_CPU (sd)->state.regs[12];
sc.arg2 = MSP430_CPU (sd)->state.regs[13];
sc.arg3 = MSP430_CPU (sd)->state.regs[14];
sc.arg4 = MSP430_CPU (sd)->state.regs[15];
if (TRACE_SYSCALL_P (MSP430_CPU (sd)))
{
const char *syscall_name = "*unknown*";
switch (syscall_num)
{
case TARGET_SYS_exit:
syscall_name = "exit(%d)";
break;
case TARGET_SYS_open:
syscall_name = "open(%#x,%#x)";
break;
case TARGET_SYS_close:
syscall_name = "close(%d)";
break;
case TARGET_SYS_read:
syscall_name = "read(%d,%#x,%d)";
break;
case TARGET_SYS_write:
syscall_name = "write(%d,%#x,%d)";
break;
}
trace_generic (sd, MSP430_CPU (sd), TRACE_SYSCALL_IDX,
syscall_name, sc.arg1, sc.arg2, sc.arg3, sc.arg4);
}
/* Handle SYS_exit here. */
if (syscall_num == 1)
{
sim_engine_halt (sd, MSP430_CPU (sd), NULL,
MSP430_CPU (sd)->state.regs[0],
sim_exited, sc.arg1);
return 1;
}
sc.p1 = sd;
sc.p2 = MSP430_CPU (sd);
sc.read_mem = sim_syscall_read_mem;
sc.write_mem = sim_syscall_write_mem;
cb_syscall (cb, &sc);
TRACE_SYSCALL (MSP430_CPU (sd), "returns %ld", sc.result);
MSP430_CPU (sd)->state.regs[12] = sc.result;
MSP430_CPU (sd)->state.regs[12] = sim_syscall (MSP430_CPU (sd),
syscall_num, arg1, arg2,
arg3, arg4);
return 1;
}