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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"
#include "qemu/guest-random.h"
#include "semihosting/common-semi.h"
#include "target/arm/syndrome.h"
#include "target/arm/cpu-features.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
if (!__r && bswap_code(arm_sctlr_b(env))) { \
(x) = bswap32(x); \
} \
__r; \
})
#define get_user_code_u16(x, gaddr, env) \
({ abi_long __r = get_user_u16((x), (gaddr)); \
if (!__r && bswap_code(arm_sctlr_b(env))) { \
(x) = bswap16(x); \
} \
__r; \
})
#define get_user_data_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
if (!__r && arm_cpu_bswap_data(env)) { \
(x) = bswap32(x); \
} \
__r; \
})
#define get_user_data_u16(x, gaddr, env) \
({ abi_long __r = get_user_u16((x), (gaddr)); \
if (!__r && arm_cpu_bswap_data(env)) { \
(x) = bswap16(x); \
} \
__r; \
})
#define put_user_data_u32(x, gaddr, env) \
({ typeof(x) __x = (x); \
if (arm_cpu_bswap_data(env)) { \
__x = bswap32(__x); \
} \
put_user_u32(__x, (gaddr)); \
})
#define put_user_data_u16(x, gaddr, env) \
({ typeof(x) __x = (x); \
if (arm_cpu_bswap_data(env)) { \
__x = bswap16(__x); \
} \
put_user_u16(__x, (gaddr)); \
})
/* AArch64 main loop */
void cpu_loop(CPUARMState *env)
{
CPUState *cs = env_cpu(env);
int trapnr, ec, fsc, si_code, si_signo;
abi_long ret;
for (;;) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
switch (trapnr) {
case EXCP_SWI:
/* On syscall, PSTATE.ZA is preserved, PSTATE.SM is cleared. */
aarch64_set_svcr(env, 0, R_SVCR_SM_MASK);
ret = do_syscall(env,
env->xregs[8],
env->xregs[0],
env->xregs[1],
env->xregs[2],
env->xregs[3],
env->xregs[4],
env->xregs[5],
0, 0);
if (ret == -QEMU_ERESTARTSYS) {
env->pc -= 4;
} else if (ret != -QEMU_ESIGRETURN) {
env->xregs[0] = ret;
}
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_UDEF:
force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
break;
case EXCP_PREFETCH_ABORT:
case EXCP_DATA_ABORT:
ec = syn_get_ec(env->exception.syndrome);
switch (ec) {
case EC_DATAABORT:
case EC_INSNABORT:
/* Both EC have the same format for FSC, or close enough. */
fsc = extract32(env->exception.syndrome, 0, 6);
switch (fsc) {
case 0x04 ... 0x07: /* Translation fault, level {0-3} */
si_signo = TARGET_SIGSEGV;
si_code = TARGET_SEGV_MAPERR;
break;
case 0x09 ... 0x0b: /* Access flag fault, level {1-3} */
case 0x0d ... 0x0f: /* Permission fault, level {1-3} */
si_signo = TARGET_SIGSEGV;
si_code = TARGET_SEGV_ACCERR;
break;
case 0x11: /* Synchronous Tag Check Fault */
si_signo = TARGET_SIGSEGV;
si_code = TARGET_SEGV_MTESERR;
break;
case 0x21: /* Alignment fault */
si_signo = TARGET_SIGBUS;
si_code = TARGET_BUS_ADRALN;
break;
default:
g_assert_not_reached();
}
break;
case EC_PCALIGNMENT:
si_signo = TARGET_SIGBUS;
si_code = TARGET_BUS_ADRALN;
break;
default:
g_assert_not_reached();
}
force_sig_fault(si_signo, si_code, env->exception.vaddress);
break;
case EXCP_DEBUG:
case EXCP_BKPT:
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
break;
case EXCP_SEMIHOST:
do_common_semihosting(cs);
env->pc += 4;
break;
case EXCP_YIELD:
/* nothing to do here for user-mode, just resume guest code */
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;
default:
EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
abort();
}
/* Check for MTE asynchronous faults */
if (unlikely(env->cp15.tfsr_el[0])) {
env->cp15.tfsr_el[0] = 0;
force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MTEAERR, 0);
}
process_pending_signals(env);
/* Exception return on AArch64 always clears the exclusive monitor,
* so any return to running guest code implies this.
*/
env->exclusive_addr = -1;
}
}
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
ARMCPU *cpu = env_archcpu(env);
CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
struct image_info *info = ts->info;
int i;
if (!(arm_feature(env, ARM_FEATURE_AARCH64))) {
fprintf(stderr,
"The selected ARM CPU does not support 64 bit mode\n");
exit(EXIT_FAILURE);
}
for (i = 0; i < 31; i++) {
env->xregs[i] = regs->regs[i];
}
env->pc = regs->pc;
env->xregs[31] = regs->sp;
#if TARGET_BIG_ENDIAN
env->cp15.sctlr_el[1] |= SCTLR_E0E;
for (i = 1; i < 4; ++i) {
env->cp15.sctlr_el[i] |= SCTLR_EE;
}
arm_rebuild_hflags(env);
#endif
if (cpu_isar_feature(aa64_pauth, cpu)) {
qemu_guest_getrandom_nofail(&env->keys, sizeof(env->keys));
}
ts->stack_base = info->start_stack;
ts->heap_base = info->brk;
/* This will be filled in on the first SYS_HEAPINFO call. */
ts->heap_limit = 0;
}
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