diff options
Diffstat (limited to 'bsd-user/aarch64/target_arch_cpu.h')
| -rw-r--r-- | bsd-user/aarch64/target_arch_cpu.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/bsd-user/aarch64/target_arch_cpu.h b/bsd-user/aarch64/target_arch_cpu.h new file mode 100644 index 0000000..87fbf6d --- /dev/null +++ b/bsd-user/aarch64/target_arch_cpu.h @@ -0,0 +1,189 @@ +/* + * ARM AArch64 cpu init and loop + * + * Copyright (c) 2015 Stacey Son + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef TARGET_ARCH_CPU_H +#define TARGET_ARCH_CPU_H + +#include "target_arch.h" +#include "signal-common.h" +#include "target/arm/syndrome.h" + +#define TARGET_DEFAULT_CPU_MODEL "any" + +static inline void target_cpu_init(CPUARMState *env, + struct target_pt_regs *regs) +{ + int i; + + if (!(arm_feature(env, ARM_FEATURE_AARCH64))) { + fprintf(stderr, "The selected ARM CPU does not support 64 bit mode\n"); + exit(1); + } + for (i = 0; i < 31; i++) { + env->xregs[i] = regs->regs[i]; + } + env->pc = regs->pc; + env->xregs[31] = regs->sp; +} + + +static inline G_NORETURN void target_cpu_loop(CPUARMState *env) +{ + CPUState *cs = env_cpu(env); + int trapnr, ec, fsc, si_code, si_signo; + uint64_t code, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8; + 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: + /* See arm64/arm64/trap.c cpu_fetch_syscall_args() */ + code = env->xregs[8]; + if (code == TARGET_FREEBSD_NR_syscall || + code == TARGET_FREEBSD_NR___syscall) { + code = env->xregs[0]; + arg1 = env->xregs[1]; + arg2 = env->xregs[2]; + arg3 = env->xregs[3]; + arg4 = env->xregs[4]; + arg5 = env->xregs[5]; + arg6 = env->xregs[6]; + arg7 = env->xregs[7]; + arg8 = 0; + } else { + arg1 = env->xregs[0]; + arg2 = env->xregs[1]; + arg3 = env->xregs[2]; + arg4 = env->xregs[3]; + arg5 = env->xregs[4]; + arg6 = env->xregs[5]; + arg7 = env->xregs[6]; + arg8 = env->xregs[7]; + } + ret = do_freebsd_syscall(env, code, arg1, arg2, arg3, + arg4, arg5, arg6, arg7, arg8); + /* + * The carry bit is cleared for no error; set for error. + * See arm64/arm64/vm_machdep.c cpu_set_syscall_retval() + */ + if (ret >= 0) { + env->CF = 0; + env->xregs[0] = ret; + } else if (ret == -TARGET_ERESTART) { + env->pc -= 4; + break; + } else if (ret != -TARGET_EJUSTRETURN) { + env->CF = 1; + env->xregs[0] = -ret; + } + break; + + case EXCP_INTERRUPT: + /* Just indicate that signals should be handle ASAP. */ + break; + + case EXCP_UDEF: + force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc); + break; + + + case EXCP_PREFETCH_ABORT: + case EXCP_DATA_ABORT: + /* We should only arrive here with EC in {DATAABORT, INSNABORT}. */ + ec = syn_get_ec(env->exception.syndrome); + assert(ec == EC_DATAABORT || ec == 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; */ TARGET_SEGV_ACCERR; + break; + case 0x21: /* Alignment fault */ + 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_ATOMIC: + cpu_exec_step_atomic(cs); + break; + + case EXCP_YIELD: + /* nothing to do here for user-mode, just resume guest code */ + break; + default: + fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n", + trapnr); + cpu_dump_state(cs, stderr, 0); + abort(); + } /* switch() */ + process_pending_signals(env); + /* + * Exception return on AArch64 always clears the exclusive + * monitor, so any return to running guest code implies this. + * A strex (successful or otherwise) also clears the monitor, so + * we don't need to specialcase EXCP_STREX. + */ + env->exclusive_addr = -1; + } /* for (;;) */ +} + + +/* See arm64/arm64/vm_machdep.c cpu_fork() */ +static inline void target_cpu_clone_regs(CPUARMState *env, target_ulong newsp) +{ + if (newsp) { + env->xregs[31] = newsp; + } + env->regs[0] = 0; + env->regs[1] = 0; + pstate_write(env, 0); +} + +static inline void target_cpu_reset(CPUArchState *env) +{ +} + + +#endif /* TARGET_ARCH_CPU_H */ |