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/*
* qemu user cpu loop
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu.h"
#include "user-internals.h"
#include "cpu_loop-common.h"
#include "signal-common.h"
static abi_ulong hppa_lws(CPUHPPAState *env)
{
CPUState *cs = env_cpu(env);
uint32_t which = env->gr[20];
abi_ulong addr = env->gr[26];
abi_ulong old = env->gr[25];
abi_ulong new = env->gr[24];
abi_ulong size, ret;
switch (which) {
default:
return -TARGET_ENOSYS;
case 0: /* elf32 atomic 32bit cmpxchg */
if ((addr & 3) || !access_ok(cs, VERIFY_WRITE, addr, 4)) {
return -TARGET_EFAULT;
}
old = tswap32(old);
new = tswap32(new);
ret = qatomic_cmpxchg((uint32_t *)g2h(cs, addr), old, new);
ret = tswap32(ret);
break;
case 2: /* elf32 atomic "new" cmpxchg */
size = env->gr[23];
if (size >= 4) {
return -TARGET_ENOSYS;
}
if (((addr | old | new) & ((1 << size) - 1))
|| !access_ok(cs, VERIFY_WRITE, addr, 1 << size)
|| !access_ok(cs, VERIFY_READ, old, 1 << size)
|| !access_ok(cs, VERIFY_READ, new, 1 << size)) {
return -TARGET_EFAULT;
}
/* Note that below we use host-endian loads so that the cmpxchg
can be host-endian as well. */
switch (size) {
case 0:
old = *(uint8_t *)g2h(cs, old);
new = *(uint8_t *)g2h(cs, new);
ret = qatomic_cmpxchg((uint8_t *)g2h(cs, addr), old, new);
ret = ret != old;
break;
case 1:
old = *(uint16_t *)g2h(cs, old);
new = *(uint16_t *)g2h(cs, new);
ret = qatomic_cmpxchg((uint16_t *)g2h(cs, addr), old, new);
ret = ret != old;
break;
case 2:
old = *(uint32_t *)g2h(cs, old);
new = *(uint32_t *)g2h(cs, new);
ret = qatomic_cmpxchg((uint32_t *)g2h(cs, addr), old, new);
ret = ret != old;
break;
case 3:
{
uint64_t o64, n64, r64;
o64 = *(uint64_t *)g2h(cs, old);
n64 = *(uint64_t *)g2h(cs, new);
#ifdef CONFIG_ATOMIC64
r64 = qatomic_cmpxchg__nocheck((aligned_uint64_t *)g2h(cs, addr),
o64, n64);
ret = r64 != o64;
#else
start_exclusive();
r64 = *(uint64_t *)g2h(cs, addr);
ret = 1;
if (r64 == o64) {
*(uint64_t *)g2h(cs, addr) = n64;
ret = 0;
}
end_exclusive();
#endif
}
break;
default:
g_assert_not_reached();
}
break;
}
env->gr[28] = ret;
return 0;
}
void cpu_loop(CPUHPPAState *env)
{
CPUState *cs = env_cpu(env);
abi_ulong ret;
int trapnr;
while (1) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
switch (trapnr) {
case EXCP_SYSCALL:
ret = do_syscall(env, env->gr[20],
env->gr[26], env->gr[25],
env->gr[24], env->gr[23],
env->gr[22], env->gr[21], 0, 0);
switch (ret) {
default:
env->gr[28] = ret;
/* We arrived here by faking the gateway page. Return. */
env->iaoq_f = env->gr[31] | PRIV_USER;
env->iaoq_b = env->iaoq_f + 4;
break;
case -QEMU_ERESTARTSYS:
case -QEMU_ESIGRETURN:
break;
}
break;
case EXCP_SYSCALL_LWS:
env->gr[21] = hppa_lws(env);
/* We arrived here by faking the gateway page. Return. */
env->iaoq_f = env->gr[31] | PRIV_USER;
env->iaoq_b = env->iaoq_f + 4;
break;
case EXCP_IMP:
force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, env->iaoq_f);
break;
case EXCP_ILL:
force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->iaoq_f);
break;
case EXCP_PRIV_OPR:
/* check for glibc ABORT_INSTRUCTION "iitlbp %r0,(%sr0, %r0)" */
if (env->cr[CR_IIR] == 0x04000000) {
force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->iaoq_f);
} else {
force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVOPC, env->iaoq_f);
}
break;
case EXCP_PRIV_REG:
force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVREG, env->iaoq_f);
break;
case EXCP_OVERFLOW:
force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->iaoq_f);
break;
case EXCP_COND:
force_sig_fault(TARGET_SIGFPE, TARGET_FPE_CONDTRAP, env->iaoq_f);
break;
case EXCP_ASSIST:
force_sig_fault(TARGET_SIGFPE, 0, env->iaoq_f);
break;
case EXCP_BREAK:
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->iaoq_f);
break;
case EXCP_DEBUG:
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->iaoq_f);
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
default:
EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
abort();
}
process_pending_signals(env);
}
}
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
int i;
for (i = 1; i < 32; i++) {
env->gr[i] = regs->gr[i];
}
env->iaoq_f = regs->iaoq[0];
env->iaoq_b = regs->iaoq[1];
}
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