Nios II user-mode emulation was missing handling for EXCP_DEBUG, making the gdb stub essentially useless. This patch adds the missing piece. The new code was copied from the existing EXCP_TRAP handling and is also similar to what other targets (e.g., arm) do with EXCP_DEBUG. Signed-off-by: Sandra Loosemore <sandra@codesourcery.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <1550076626-7202-1-git-send-email-sandra@codesourcery.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
154 lines
5.1 KiB
C
154 lines
5.1 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.h"
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#include "cpu_loop-common.h"
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void cpu_loop(CPUNios2State *env)
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{
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CPUState *cs = ENV_GET_CPU(env);
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Nios2CPU *cpu = NIOS2_CPU(cs);
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target_siginfo_t info;
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int trapnr, ret;
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for (;;) {
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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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switch (trapnr) {
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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 EXCP_TRAP:
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if (env->regs[R_AT] == 0) {
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abi_long ret;
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qemu_log_mask(CPU_LOG_INT, "\nSyscall\n");
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ret = do_syscall(env, env->regs[2],
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env->regs[4], env->regs[5], env->regs[6],
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env->regs[7], env->regs[8], env->regs[9],
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0, 0);
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if (env->regs[2] == 0) { /* FIXME: syscall 0 workaround */
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ret = 0;
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}
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env->regs[2] = abs(ret);
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/* Return value is 0..4096 */
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env->regs[7] = (ret > 0xfffffffffffff000ULL);
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env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
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env->regs[CR_STATUS] &= ~0x3;
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env->regs[R_EA] = env->regs[R_PC] + 4;
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env->regs[R_PC] += 4;
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break;
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} else {
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qemu_log_mask(CPU_LOG_INT, "\nTrap\n");
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env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
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env->regs[CR_STATUS] &= ~0x3;
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env->regs[R_EA] = env->regs[R_PC] + 4;
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env->regs[R_PC] = cpu->exception_addr;
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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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}
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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 0xaa:
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switch (env->regs[R_PC]) {
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/*case 0x1000:*/ /* TODO:__kuser_helper_version */
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case 0x1004: /* __kuser_cmpxchg */
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start_exclusive();
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if (env->regs[4] & 0x3) {
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goto kuser_fail;
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}
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ret = get_user_u32(env->regs[2], env->regs[4]);
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if (ret) {
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end_exclusive();
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goto kuser_fail;
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}
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env->regs[2] -= env->regs[5];
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if (env->regs[2] == 0) {
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put_user_u32(env->regs[6], env->regs[4]);
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}
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end_exclusive();
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env->regs[R_PC] = env->regs[R_RA];
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break;
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/*case 0x1040:*/ /* TODO:__kuser_sigtramp */
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default:
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;
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kuser_fail:
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info.si_signo = TARGET_SIGSEGV;
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info.si_errno = 0;
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/* TODO: check env->error_code */
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info.si_code = TARGET_SEGV_MAPERR;
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info._sifields._sigfault._addr = env->regs[R_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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default:
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EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
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trapnr);
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abort();
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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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env->regs[0] = 0;
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env->regs[1] = regs->r1;
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env->regs[2] = regs->r2;
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env->regs[3] = regs->r3;
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env->regs[4] = regs->r4;
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env->regs[5] = regs->r5;
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env->regs[6] = regs->r6;
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env->regs[7] = regs->r7;
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env->regs[8] = regs->r8;
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env->regs[9] = regs->r9;
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env->regs[10] = regs->r10;
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env->regs[11] = regs->r11;
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env->regs[12] = regs->r12;
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env->regs[13] = regs->r13;
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env->regs[14] = regs->r14;
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env->regs[15] = regs->r15;
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/* TODO: unsigned long orig_r2; */
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env->regs[R_RA] = regs->ra;
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env->regs[R_FP] = regs->fp;
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env->regs[R_SP] = regs->sp;
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env->regs[R_GP] = regs->gp;
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env->regs[CR_ESTATUS] = regs->estatus;
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env->regs[R_EA] = regs->ea;
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/* TODO: unsigned long orig_r7; */
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/* Emulate eret when starting thread. */
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env->regs[R_PC] = regs->ea;
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}
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