| /* |
| * 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" |
| |
| #define SPARC64_STACK_BIAS 2047 |
| |
| //#define DEBUG_WIN |
| |
| /* WARNING: dealing with register windows _is_ complicated. More info |
| can be found at http://www.sics.se/~psm/sparcstack.html */ |
| static inline int get_reg_index(CPUSPARCState *env, int cwp, int index) |
| { |
| index = (index + cwp * 16) % (16 * env->nwindows); |
| /* wrap handling : if cwp is on the last window, then we use the |
| registers 'after' the end */ |
| if (index < 8 && env->cwp == env->nwindows - 1) |
| index += 16 * env->nwindows; |
| return index; |
| } |
| |
| /* save the register window 'cwp1' */ |
| static inline void save_window_offset(CPUSPARCState *env, int cwp1) |
| { |
| unsigned int i; |
| abi_ulong sp_ptr; |
| |
| sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)]; |
| #ifdef TARGET_SPARC64 |
| if (sp_ptr & 3) |
| sp_ptr += SPARC64_STACK_BIAS; |
| #endif |
| #if defined(DEBUG_WIN) |
| printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n", |
| sp_ptr, cwp1); |
| #endif |
| for(i = 0; i < 16; i++) { |
| /* FIXME - what to do if put_user() fails? */ |
| put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr); |
| sp_ptr += sizeof(abi_ulong); |
| } |
| } |
| |
| static void save_window(CPUSPARCState *env) |
| { |
| #ifndef TARGET_SPARC64 |
| unsigned int new_wim; |
| new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) & |
| ((1LL << env->nwindows) - 1); |
| save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2)); |
| env->wim = new_wim; |
| #else |
| /* |
| * cansave is zero if the spill trap handler is triggered by `save` and |
| * nonzero if triggered by a `flushw` |
| */ |
| save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2)); |
| env->cansave++; |
| env->canrestore--; |
| #endif |
| } |
| |
| static void restore_window(CPUSPARCState *env) |
| { |
| #ifndef TARGET_SPARC64 |
| unsigned int new_wim; |
| #endif |
| unsigned int i, cwp1; |
| abi_ulong sp_ptr; |
| |
| #ifndef TARGET_SPARC64 |
| new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) & |
| ((1LL << env->nwindows) - 1); |
| #endif |
| |
| /* restore the invalid window */ |
| cwp1 = cpu_cwp_inc(env, env->cwp + 1); |
| sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)]; |
| #ifdef TARGET_SPARC64 |
| if (sp_ptr & 3) |
| sp_ptr += SPARC64_STACK_BIAS; |
| #endif |
| #if defined(DEBUG_WIN) |
| printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n", |
| sp_ptr, cwp1); |
| #endif |
| for(i = 0; i < 16; i++) { |
| /* FIXME - what to do if get_user() fails? */ |
| get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr); |
| sp_ptr += sizeof(abi_ulong); |
| } |
| #ifdef TARGET_SPARC64 |
| env->canrestore++; |
| if (env->cleanwin < env->nwindows - 1) |
| env->cleanwin++; |
| env->cansave--; |
| #else |
| env->wim = new_wim; |
| #endif |
| } |
| |
| static void flush_windows(CPUSPARCState *env) |
| { |
| int offset, cwp1; |
| |
| offset = 1; |
| for(;;) { |
| /* if restore would invoke restore_window(), then we can stop */ |
| cwp1 = cpu_cwp_inc(env, env->cwp + offset); |
| #ifndef TARGET_SPARC64 |
| if (env->wim & (1 << cwp1)) |
| break; |
| #else |
| if (env->canrestore == 0) |
| break; |
| env->cansave++; |
| env->canrestore--; |
| #endif |
| save_window_offset(env, cwp1); |
| offset++; |
| } |
| cwp1 = cpu_cwp_inc(env, env->cwp + 1); |
| #ifndef TARGET_SPARC64 |
| /* set wim so that restore will reload the registers */ |
| env->wim = 1 << cwp1; |
| #endif |
| #if defined(DEBUG_WIN) |
| printf("flush_windows: nb=%d\n", offset - 1); |
| #endif |
| } |
| |
| static void next_instruction(CPUSPARCState *env) |
| { |
| env->pc = env->npc; |
| env->npc = env->npc + 4; |
| } |
| |
| static uint32_t do_getcc(CPUSPARCState *env) |
| { |
| #ifdef TARGET_SPARC64 |
| return cpu_get_ccr(env) & 0xf; |
| #else |
| return extract32(cpu_get_psr(env), 20, 4); |
| #endif |
| } |
| |
| static void do_setcc(CPUSPARCState *env, uint32_t icc) |
| { |
| #ifdef TARGET_SPARC64 |
| cpu_put_ccr(env, (cpu_get_ccr(env) & 0xf0) | (icc & 0xf)); |
| #else |
| cpu_put_psr(env, deposit32(cpu_get_psr(env), 20, 4, icc)); |
| #endif |
| } |
| |
| static uint32_t do_getpsr(CPUSPARCState *env) |
| { |
| #ifdef TARGET_SPARC64 |
| const uint64_t TSTATE_CWP = 0x1f; |
| const uint64_t TSTATE_ICC = 0xfull << 32; |
| const uint64_t TSTATE_XCC = 0xfull << 36; |
| const uint32_t PSR_S = 0x00000080u; |
| const uint32_t PSR_V8PLUS = 0xff000000u; |
| uint64_t tstate = sparc64_tstate(env); |
| |
| /* See <asm/psrcompat.h>, tstate_to_psr. */ |
| return ((tstate & TSTATE_CWP) | |
| PSR_S | |
| ((tstate & TSTATE_ICC) >> 12) | |
| ((tstate & TSTATE_XCC) >> 20) | |
| PSR_V8PLUS); |
| #else |
| return (cpu_get_psr(env) & (PSR_ICC | PSR_CWP)) | PSR_S; |
| #endif |
| } |
| |
| /* Avoid ifdefs below for the abi32 and abi64 paths. */ |
| #ifdef TARGET_ABI32 |
| #define TARGET_TT_SYSCALL (TT_TRAP + 0x10) /* t_linux */ |
| #define syscall_cc psr |
| #else |
| #define TARGET_TT_SYSCALL (TT_TRAP + 0x6d) /* tl0_linux64 */ |
| #define syscall_cc xcc |
| #endif |
| |
| /* Avoid ifdefs below for the v9 and pre-v9 hw traps. */ |
| #ifdef TARGET_SPARC64 |
| #define TARGET_TT_SPILL TT_SPILL |
| #define TARGET_TT_FILL TT_FILL |
| #else |
| #define TARGET_TT_SPILL TT_WIN_OVF |
| #define TARGET_TT_FILL TT_WIN_UNF |
| #endif |
| |
| void cpu_loop (CPUSPARCState *env) |
| { |
| CPUState *cs = env_cpu(env); |
| int trapnr; |
| abi_long ret; |
| |
| while (1) { |
| cpu_exec_start(cs); |
| trapnr = cpu_exec(cs); |
| cpu_exec_end(cs); |
| process_queued_cpu_work(cs); |
| |
| /* Compute PSR before exposing state. */ |
| if (env->cc_op != CC_OP_FLAGS) { |
| cpu_get_psr(env); |
| } |
| |
| switch (trapnr) { |
| case TARGET_TT_SYSCALL: |
| ret = do_syscall (env, env->gregs[1], |
| env->regwptr[0], env->regwptr[1], |
| env->regwptr[2], env->regwptr[3], |
| env->regwptr[4], env->regwptr[5], |
| 0, 0); |
| if (ret == -QEMU_ERESTARTSYS || ret == -QEMU_ESIGRETURN) { |
| break; |
| } |
| if ((abi_ulong)ret >= (abi_ulong)(-515)) { |
| env->syscall_cc |= PSR_CARRY; |
| ret = -ret; |
| } else { |
| env->syscall_cc &= ~PSR_CARRY; |
| } |
| env->regwptr[0] = ret; |
| /* next instruction */ |
| env->pc = env->npc; |
| env->npc = env->npc + 4; |
| break; |
| |
| case TT_TRAP + 0x01: /* breakpoint */ |
| case EXCP_DEBUG: |
| force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); |
| break; |
| |
| case TT_TRAP + 0x02: /* div0 */ |
| case TT_DIV_ZERO: |
| force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc); |
| break; |
| |
| case TT_TRAP + 0x03: /* flush windows */ |
| flush_windows(env); |
| next_instruction(env); |
| break; |
| |
| case TT_TRAP + 0x20: /* getcc */ |
| env->gregs[1] = do_getcc(env); |
| next_instruction(env); |
| break; |
| case TT_TRAP + 0x21: /* setcc */ |
| do_setcc(env, env->gregs[1]); |
| next_instruction(env); |
| break; |
| case TT_TRAP + 0x22: /* getpsr */ |
| env->gregs[1] = do_getpsr(env); |
| next_instruction(env); |
| break; |
| |
| #ifdef TARGET_SPARC64 |
| case TT_TRAP + 0x6e: |
| flush_windows(env); |
| sparc64_get_context(env); |
| break; |
| case TT_TRAP + 0x6f: |
| flush_windows(env); |
| sparc64_set_context(env); |
| break; |
| #endif |
| |
| case TARGET_TT_SPILL: /* window overflow */ |
| save_window(env); |
| break; |
| case TARGET_TT_FILL: /* window underflow */ |
| restore_window(env); |
| break; |
| |
| case TT_FP_EXCP: |
| { |
| int code = TARGET_FPE_FLTUNK; |
| target_ulong fsr = env->fsr; |
| |
| if ((fsr & FSR_FTT_MASK) == FSR_FTT_IEEE_EXCP) { |
| if (fsr & FSR_NVC) { |
| code = TARGET_FPE_FLTINV; |
| } else if (fsr & FSR_OFC) { |
| code = TARGET_FPE_FLTOVF; |
| } else if (fsr & FSR_UFC) { |
| code = TARGET_FPE_FLTUND; |
| } else if (fsr & FSR_DZC) { |
| code = TARGET_FPE_FLTDIV; |
| } else if (fsr & FSR_NXC) { |
| code = TARGET_FPE_FLTRES; |
| } |
| } |
| force_sig_fault(TARGET_SIGFPE, code, env->pc); |
| } |
| break; |
| |
| case EXCP_INTERRUPT: |
| /* just indicate that signals should be handled asap */ |
| break; |
| case TT_ILL_INSN: |
| force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->pc); |
| break; |
| case TT_PRIV_INSN: |
| force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVOPC, env->pc); |
| break; |
| case TT_TOVF: |
| force_sig_fault(TARGET_SIGEMT, TARGET_EMT_TAGOVF, env->pc); |
| break; |
| #ifdef TARGET_SPARC64 |
| case TT_PRIV_ACT: |
| /* Note do_privact defers to do_privop. */ |
| force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVOPC, env->pc); |
| break; |
| #else |
| case TT_NCP_INSN: |
| force_sig_fault(TARGET_SIGILL, TARGET_ILL_COPROC, env->pc); |
| break; |
| case TT_UNIMP_FLUSH: |
| next_instruction(env); |
| break; |
| #endif |
| case EXCP_ATOMIC: |
| cpu_exec_step_atomic(cs); |
| break; |
| default: |
| /* |
| * Most software trap numbers vector to BAD_TRAP. |
| * Handle anything not explicitly matched above. |
| */ |
| if (trapnr >= TT_TRAP && trapnr <= TT_TRAP + 0x7f) { |
| force_sig_fault(TARGET_SIGILL, ILL_ILLTRP, env->pc); |
| break; |
| } |
| fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); |
| cpu_dump_state(cs, stderr, 0); |
| exit(EXIT_FAILURE); |
| } |
| process_pending_signals (env); |
| } |
| } |
| |
| void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) |
| { |
| int i; |
| env->pc = regs->pc; |
| env->npc = regs->npc; |
| env->y = regs->y; |
| for(i = 0; i < 8; i++) |
| env->gregs[i] = regs->u_regs[i]; |
| for(i = 0; i < 8; i++) |
| env->regwptr[i] = regs->u_regs[i + 8]; |
| } |
