57a0c9384c
This value is fully internal to qemu, and so is not a TARGET define. Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
281 lines
7.9 KiB
C
281 lines
7.9 KiB
C
/*
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* qemu user cpu loop
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu.h"
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#include "user-internals.h"
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#include "cpu_loop-common.h"
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#include "signal-common.h"
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#define SPARC64_STACK_BIAS 2047
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//#define DEBUG_WIN
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/* WARNING: dealing with register windows _is_ complicated. More info
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can be found at http://www.sics.se/~psm/sparcstack.html */
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static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
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{
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index = (index + cwp * 16) % (16 * env->nwindows);
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/* wrap handling : if cwp is on the last window, then we use the
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registers 'after' the end */
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if (index < 8 && env->cwp == env->nwindows - 1)
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index += 16 * env->nwindows;
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return index;
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}
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/* save the register window 'cwp1' */
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static inline void save_window_offset(CPUSPARCState *env, int cwp1)
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{
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unsigned int i;
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abi_ulong sp_ptr;
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sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
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#ifdef TARGET_SPARC64
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if (sp_ptr & 3)
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sp_ptr += SPARC64_STACK_BIAS;
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#endif
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#if defined(DEBUG_WIN)
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printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
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sp_ptr, cwp1);
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#endif
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for(i = 0; i < 16; i++) {
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/* FIXME - what to do if put_user() fails? */
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put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
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sp_ptr += sizeof(abi_ulong);
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}
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}
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static void save_window(CPUSPARCState *env)
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{
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#ifndef TARGET_SPARC64
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unsigned int new_wim;
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new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
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((1LL << env->nwindows) - 1);
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save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
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env->wim = new_wim;
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#else
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/*
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* cansave is zero if the spill trap handler is triggered by `save` and
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* nonzero if triggered by a `flushw`
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*/
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save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
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env->cansave++;
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env->canrestore--;
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#endif
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}
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static void restore_window(CPUSPARCState *env)
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{
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#ifndef TARGET_SPARC64
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unsigned int new_wim;
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#endif
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unsigned int i, cwp1;
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abi_ulong sp_ptr;
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#ifndef TARGET_SPARC64
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new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
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((1LL << env->nwindows) - 1);
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#endif
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/* restore the invalid window */
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cwp1 = cpu_cwp_inc(env, env->cwp + 1);
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sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
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#ifdef TARGET_SPARC64
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if (sp_ptr & 3)
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sp_ptr += SPARC64_STACK_BIAS;
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#endif
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#if defined(DEBUG_WIN)
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printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
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sp_ptr, cwp1);
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#endif
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for(i = 0; i < 16; i++) {
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/* FIXME - what to do if get_user() fails? */
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get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
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sp_ptr += sizeof(abi_ulong);
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}
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#ifdef TARGET_SPARC64
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env->canrestore++;
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if (env->cleanwin < env->nwindows - 1)
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env->cleanwin++;
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env->cansave--;
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#else
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env->wim = new_wim;
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#endif
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}
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static void flush_windows(CPUSPARCState *env)
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{
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int offset, cwp1;
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offset = 1;
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for(;;) {
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/* if restore would invoke restore_window(), then we can stop */
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cwp1 = cpu_cwp_inc(env, env->cwp + offset);
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#ifndef TARGET_SPARC64
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if (env->wim & (1 << cwp1))
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break;
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#else
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if (env->canrestore == 0)
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break;
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env->cansave++;
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env->canrestore--;
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#endif
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save_window_offset(env, cwp1);
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offset++;
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}
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cwp1 = cpu_cwp_inc(env, env->cwp + 1);
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#ifndef TARGET_SPARC64
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/* set wim so that restore will reload the registers */
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env->wim = 1 << cwp1;
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#endif
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#if defined(DEBUG_WIN)
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printf("flush_windows: nb=%d\n", offset - 1);
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#endif
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}
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void cpu_loop (CPUSPARCState *env)
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{
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CPUState *cs = env_cpu(env);
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int trapnr;
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abi_long ret;
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target_siginfo_t info;
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while (1) {
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cpu_exec_start(cs);
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trapnr = cpu_exec(cs);
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cpu_exec_end(cs);
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process_queued_cpu_work(cs);
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/* Compute PSR before exposing state. */
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if (env->cc_op != CC_OP_FLAGS) {
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cpu_get_psr(env);
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}
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switch (trapnr) {
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#ifndef TARGET_SPARC64
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case 0x88:
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case 0x90:
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#else
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case 0x110:
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case 0x16d:
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#endif
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ret = do_syscall (env, env->gregs[1],
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env->regwptr[0], env->regwptr[1],
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env->regwptr[2], env->regwptr[3],
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env->regwptr[4], env->regwptr[5],
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0, 0);
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if (ret == -QEMU_ERESTARTSYS || ret == -QEMU_ESIGRETURN) {
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break;
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}
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if ((abi_ulong)ret >= (abi_ulong)(-515)) {
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#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
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env->xcc |= PSR_CARRY;
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#else
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env->psr |= PSR_CARRY;
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#endif
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ret = -ret;
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} else {
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#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
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env->xcc &= ~PSR_CARRY;
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#else
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env->psr &= ~PSR_CARRY;
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#endif
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}
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env->regwptr[0] = ret;
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/* next instruction */
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env->pc = env->npc;
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env->npc = env->npc + 4;
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break;
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case 0x83: /* flush windows */
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#ifdef TARGET_ABI32
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case 0x103:
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#endif
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flush_windows(env);
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/* next instruction */
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env->pc = env->npc;
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env->npc = env->npc + 4;
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break;
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#ifndef TARGET_SPARC64
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case TT_WIN_OVF: /* window overflow */
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save_window(env);
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break;
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case TT_WIN_UNF: /* window underflow */
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restore_window(env);
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break;
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#else
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case TT_SPILL: /* window overflow */
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save_window(env);
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break;
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case TT_FILL: /* window underflow */
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restore_window(env);
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break;
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#ifndef TARGET_ABI32
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case 0x16e:
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flush_windows(env);
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sparc64_get_context(env);
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break;
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case 0x16f:
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flush_windows(env);
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sparc64_set_context(env);
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break;
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#endif
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#endif
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case EXCP_INTERRUPT:
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/* just indicate that signals should be handled asap */
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break;
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case TT_ILL_INSN:
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{
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info.si_signo = TARGET_SIGILL;
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info.si_errno = 0;
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info.si_code = TARGET_ILL_ILLOPC;
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info._sifields._sigfault._addr = env->pc;
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queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
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}
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break;
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case EXCP_DEBUG:
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info.si_signo = TARGET_SIGTRAP;
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info.si_errno = 0;
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info.si_code = TARGET_TRAP_BRKPT;
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queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
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break;
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case EXCP_ATOMIC:
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cpu_exec_step_atomic(cs);
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break;
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default:
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fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
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cpu_dump_state(cs, stderr, 0);
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exit(EXIT_FAILURE);
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}
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process_pending_signals (env);
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}
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}
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void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
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{
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int i;
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env->pc = regs->pc;
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env->npc = regs->npc;
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env->y = regs->y;
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for(i = 0; i < 8; i++)
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env->gregs[i] = regs->u_regs[i];
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for(i = 0; i < 8; i++)
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env->regwptr[i] = regs->u_regs[i + 8];
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}
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