| /* |
| * 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 "elf.h" |
| #include "internal.h" |
| #include "fpu_helper.h" |
| |
| # ifdef TARGET_ABI_MIPSO32 |
| # define MIPS_SYSCALL_NUMBER_UNUSED -1 |
| static const int8_t mips_syscall_args[] = { |
| #include "syscall-args-o32.c.inc" |
| }; |
| # endif /* O32 */ |
| |
| /* Break codes */ |
| enum { |
| BRK_OVERFLOW = 6, |
| BRK_DIVZERO = 7 |
| }; |
| |
| static void do_tr_or_bp(CPUMIPSState *env, unsigned int code, bool trap) |
| { |
| target_ulong pc = env->active_tc.PC; |
| |
| switch (code) { |
| case BRK_OVERFLOW: |
| force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, pc); |
| break; |
| case BRK_DIVZERO: |
| force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, pc); |
| break; |
| default: |
| if (trap) { |
| force_sig(TARGET_SIGTRAP); |
| } else { |
| force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, pc); |
| } |
| break; |
| } |
| } |
| |
| void cpu_loop(CPUMIPSState *env) |
| { |
| CPUState *cs = env_cpu(env); |
| int trapnr, si_code; |
| unsigned int code; |
| abi_long ret; |
| # ifdef TARGET_ABI_MIPSO32 |
| unsigned int syscall_num; |
| # endif |
| |
| for(;;) { |
| cpu_exec_start(cs); |
| trapnr = cpu_exec(cs); |
| cpu_exec_end(cs); |
| process_queued_cpu_work(cs); |
| |
| switch(trapnr) { |
| case EXCP_SYSCALL: |
| env->active_tc.PC += 4; |
| # ifdef TARGET_ABI_MIPSO32 |
| syscall_num = env->active_tc.gpr[2] - 4000; |
| if (syscall_num >= sizeof(mips_syscall_args)) { |
| /* syscall_num is larger that any defined for MIPS O32 */ |
| ret = -TARGET_ENOSYS; |
| } else if (mips_syscall_args[syscall_num] == |
| MIPS_SYSCALL_NUMBER_UNUSED) { |
| /* syscall_num belongs to the range not defined for MIPS O32 */ |
| ret = -TARGET_ENOSYS; |
| } else { |
| /* syscall_num is valid */ |
| int nb_args; |
| abi_ulong sp_reg; |
| abi_ulong arg5 = 0, arg6 = 0, arg7 = 0, arg8 = 0; |
| |
| nb_args = mips_syscall_args[syscall_num]; |
| sp_reg = env->active_tc.gpr[29]; |
| switch (nb_args) { |
| /* these arguments are taken from the stack */ |
| case 8: |
| if ((ret = get_user_ual(arg8, sp_reg + 28)) != 0) { |
| goto done_syscall; |
| } |
| /* fall through */ |
| case 7: |
| if ((ret = get_user_ual(arg7, sp_reg + 24)) != 0) { |
| goto done_syscall; |
| } |
| /* fall through */ |
| case 6: |
| if ((ret = get_user_ual(arg6, sp_reg + 20)) != 0) { |
| goto done_syscall; |
| } |
| /* fall through */ |
| case 5: |
| if ((ret = get_user_ual(arg5, sp_reg + 16)) != 0) { |
| goto done_syscall; |
| } |
| /* fall through */ |
| default: |
| break; |
| } |
| ret = do_syscall(env, env->active_tc.gpr[2], |
| env->active_tc.gpr[4], |
| env->active_tc.gpr[5], |
| env->active_tc.gpr[6], |
| env->active_tc.gpr[7], |
| arg5, arg6, arg7, arg8); |
| } |
| done_syscall: |
| # else |
| ret = do_syscall(env, env->active_tc.gpr[2], |
| env->active_tc.gpr[4], env->active_tc.gpr[5], |
| env->active_tc.gpr[6], env->active_tc.gpr[7], |
| env->active_tc.gpr[8], env->active_tc.gpr[9], |
| env->active_tc.gpr[10], env->active_tc.gpr[11]); |
| # endif /* O32 */ |
| if (ret == -QEMU_ERESTARTSYS) { |
| env->active_tc.PC -= 4; |
| break; |
| } |
| if (ret == -QEMU_ESIGRETURN) { |
| /* Returning from a successful sigreturn syscall. |
| Avoid clobbering register state. */ |
| break; |
| } |
| if ((abi_ulong)ret >= (abi_ulong)-1133) { |
| env->active_tc.gpr[7] = 1; /* error flag */ |
| ret = -ret; |
| } else { |
| env->active_tc.gpr[7] = 0; /* error flag */ |
| } |
| env->active_tc.gpr[2] = ret; |
| break; |
| case EXCP_CpU: |
| case EXCP_RI: |
| case EXCP_DSPDIS: |
| force_sig(TARGET_SIGILL); |
| break; |
| case EXCP_INTERRUPT: |
| /* just indicate that signals should be handled asap */ |
| break; |
| case EXCP_DEBUG: |
| force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, |
| env->active_tc.PC); |
| break; |
| case EXCP_FPE: |
| si_code = TARGET_FPE_FLTUNK; |
| if (GET_FP_CAUSE(env->active_fpu.fcr31) & FP_INVALID) { |
| si_code = TARGET_FPE_FLTINV; |
| } else if (GET_FP_CAUSE(env->active_fpu.fcr31) & FP_DIV0) { |
| si_code = TARGET_FPE_FLTDIV; |
| } else if (GET_FP_CAUSE(env->active_fpu.fcr31) & FP_OVERFLOW) { |
| si_code = TARGET_FPE_FLTOVF; |
| } else if (GET_FP_CAUSE(env->active_fpu.fcr31) & FP_UNDERFLOW) { |
| si_code = TARGET_FPE_FLTUND; |
| } else if (GET_FP_CAUSE(env->active_fpu.fcr31) & FP_INEXACT) { |
| si_code = TARGET_FPE_FLTRES; |
| } |
| force_sig_fault(TARGET_SIGFPE, si_code, env->active_tc.PC); |
| break; |
| case EXCP_OVERFLOW: |
| force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->active_tc.PC); |
| break; |
| /* The code below was inspired by the MIPS Linux kernel trap |
| * handling code in arch/mips/kernel/traps.c. |
| */ |
| case EXCP_BREAK: |
| /* |
| * As described in the original Linux kernel code, the below |
| * checks on 'code' are to work around an old assembly bug. |
| */ |
| code = env->error_code; |
| if (code >= (1 << 10)) { |
| code >>= 10; |
| } |
| do_tr_or_bp(env, code, false); |
| break; |
| case EXCP_TRAP: |
| do_tr_or_bp(env, env->error_code, true); |
| break; |
| case EXCP_ATOMIC: |
| cpu_exec_step_atomic(cs); |
| 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) |
| { |
| CPUState *cpu = env_cpu(env); |
| TaskState *ts = get_task_state(cpu); |
| struct image_info *info = ts->info; |
| int i; |
| |
| struct mode_req { |
| bool single; |
| bool soft; |
| bool fr1; |
| bool frdefault; |
| bool fre; |
| }; |
| |
| static const struct mode_req fpu_reqs[] = { |
| [MIPS_ABI_FP_ANY] = { true, true, true, true, true }, |
| [MIPS_ABI_FP_DOUBLE] = { false, false, false, true, true }, |
| [MIPS_ABI_FP_SINGLE] = { true, false, false, false, false }, |
| [MIPS_ABI_FP_SOFT] = { false, true, false, false, false }, |
| [MIPS_ABI_FP_OLD_64] = { false, false, false, false, false }, |
| [MIPS_ABI_FP_XX] = { false, false, true, true, true }, |
| [MIPS_ABI_FP_64] = { false, false, true, false, false }, |
| [MIPS_ABI_FP_64A] = { false, false, true, false, true } |
| }; |
| |
| /* |
| * Mode requirements when .MIPS.abiflags is not present in the ELF. |
| * Not present means that everything is acceptable except FR1. |
| */ |
| static struct mode_req none_req = { true, true, false, true, true }; |
| |
| struct mode_req prog_req; |
| struct mode_req interp_req; |
| |
| for(i = 0; i < 32; i++) { |
| env->active_tc.gpr[i] = regs->regs[i]; |
| } |
| env->active_tc.PC = regs->cp0_epc & ~(target_ulong)1; |
| if (regs->cp0_epc & 1) { |
| env->hflags |= MIPS_HFLAG_M16; |
| } |
| |
| #ifdef TARGET_ABI_MIPSO32 |
| # define MAX_FP_ABI MIPS_ABI_FP_64A |
| #else |
| # define MAX_FP_ABI MIPS_ABI_FP_SOFT |
| #endif |
| if ((info->fp_abi > MAX_FP_ABI && info->fp_abi != MIPS_ABI_FP_UNKNOWN) |
| || (info->interp_fp_abi > MAX_FP_ABI && |
| info->interp_fp_abi != MIPS_ABI_FP_UNKNOWN)) { |
| fprintf(stderr, "qemu: Unexpected FPU mode\n"); |
| exit(1); |
| } |
| |
| prog_req = (info->fp_abi == MIPS_ABI_FP_UNKNOWN) ? none_req |
| : fpu_reqs[info->fp_abi]; |
| interp_req = (info->interp_fp_abi == MIPS_ABI_FP_UNKNOWN) ? none_req |
| : fpu_reqs[info->interp_fp_abi]; |
| |
| prog_req.single &= interp_req.single; |
| prog_req.soft &= interp_req.soft; |
| prog_req.fr1 &= interp_req.fr1; |
| prog_req.frdefault &= interp_req.frdefault; |
| prog_req.fre &= interp_req.fre; |
| |
| bool cpu_has_mips_r2_r6 = env->insn_flags & ISA_MIPS_R2 || |
| env->insn_flags & ISA_MIPS_R6; |
| |
| if (prog_req.fre && !prog_req.frdefault && !prog_req.fr1) { |
| env->CP0_Config5 |= (1 << CP0C5_FRE); |
| if (env->active_fpu.fcr0 & (1 << FCR0_FREP)) { |
| env->hflags |= MIPS_HFLAG_FRE; |
| } |
| } else if ((prog_req.fr1 && prog_req.frdefault) || |
| (prog_req.single && !prog_req.frdefault)) { |
| if ((env->active_fpu.fcr0 & (1 << FCR0_F64) |
| && cpu_has_mips_r2_r6) || prog_req.fr1) { |
| env->CP0_Status |= (1 << CP0St_FR); |
| env->hflags |= MIPS_HFLAG_F64; |
| } |
| } else if (prog_req.fr1) { |
| env->CP0_Status |= (1 << CP0St_FR); |
| env->hflags |= MIPS_HFLAG_F64; |
| } else if (!prog_req.fre && !prog_req.frdefault && |
| !prog_req.fr1 && !prog_req.single && !prog_req.soft) { |
| fprintf(stderr, "qemu: Can't find a matching FPU mode\n"); |
| exit(1); |
| } |
| |
| if (env->insn_flags & ISA_NANOMIPS32) { |
| return; |
| } |
| if (((info->elf_flags & EF_MIPS_NAN2008) != 0) != |
| ((env->active_fpu.fcr31 & (1 << FCR31_NAN2008)) != 0)) { |
| if ((env->active_fpu.fcr31_rw_bitmask & |
| (1 << FCR31_NAN2008)) == 0) { |
| fprintf(stderr, "ELF binary's NaN mode not supported by CPU\n"); |
| exit(1); |
| } |
| if ((info->elf_flags & EF_MIPS_NAN2008) != 0) { |
| env->active_fpu.fcr31 |= (1 << FCR31_NAN2008); |
| } else { |
| env->active_fpu.fcr31 &= ~(1 << FCR31_NAN2008); |
| } |
| restore_snan_bit_mode(env); |
| } |
| } |
