diff options
Diffstat (limited to 'target-cris/helper.c')
| -rw-r--r-- | target-cris/helper.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/target-cris/helper.c b/target-cris/helper.c new file mode 100644 index 0000000000..3db3bea08d --- /dev/null +++ b/target-cris/helper.c @@ -0,0 +1,173 @@ +/* + * CRIS helper routines. + * + * Copyright (c) 2007 AXIS Communications AB + * Written by Edgar E. Iglesias. + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <stdio.h> +#include <string.h> + +#include "config.h" +#include "cpu.h" +#include "mmu.h" +#include "exec-all.h" + +#if defined(CONFIG_USER_ONLY) + +void do_interrupt (CPUState *env) +{ + env->exception_index = -1; +} + +int cpu_cris_handle_mmu_fault(CPUState * env, target_ulong address, int rw, + int is_user, int is_softmmu) +{ + env->exception_index = 0xaa; + env->debug1 = address; + cpu_dump_state(env, stderr, fprintf, 0); + printf("%s addr=%x env->pc=%x\n", __func__, address, env->pc); + return 1; +} + +target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr) +{ + return addr; +} + +#else /* !CONFIG_USER_ONLY */ + +int cpu_cris_handle_mmu_fault (CPUState *env, target_ulong address, int rw, + int is_user, int is_softmmu) +{ + struct cris_mmu_result_t res; + int prot, miss; + target_ulong phy; + + address &= TARGET_PAGE_MASK; + prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; +// printf ("%s pc=%x %x w=%d smmu=%d\n", __func__, env->pc, address, rw, is_softmmu); + miss = cris_mmu_translate(&res, env, address, rw, is_user); + if (miss) + { + /* handle the miss. */ + phy = 0; + env->exception_index = EXCP_MMU_MISS; + } + else + { + phy = res.phy; + } +// printf ("a=%x phy=%x\n", address, phy); + return tlb_set_page(env, address, phy, prot, is_user, is_softmmu); +} + + +static void cris_shift_ccs(CPUState *env) +{ + uint32_t ccs; + /* Apply the ccs shift. */ + ccs = env->pregs[SR_CCS]; + ccs = (ccs & 0xc0000000) | ((ccs << 12) >> 2); +// printf ("ccs=%x %x\n", env->pregs[SR_CCS], ccs); + env->pregs[SR_CCS] = ccs; +} + +void do_interrupt(CPUState *env) +{ + uint32_t ebp, isr; + int irqnum; + + fflush(NULL); + +#if 0 + printf ("exception index=%d interrupt_req=%d\n", + env->exception_index, + env->interrupt_request); +#endif + + switch (env->exception_index) + { + case EXCP_BREAK: +// printf ("BREAK! %d\n", env->trapnr); + irqnum = env->trapnr; + ebp = env->pregs[SR_EBP]; + isr = ldl_code(ebp + irqnum * 4); + env->pregs[SR_ERP] = env->pc + 2; + env->pc = isr; + + cris_shift_ccs(env); + + break; + case EXCP_MMU_MISS: +// printf ("MMU miss\n"); + irqnum = 4; + ebp = env->pregs[SR_EBP]; + isr = ldl_code(ebp + irqnum * 4); + env->pregs[SR_ERP] = env->pc; + env->pc = isr; + cris_shift_ccs(env); + break; + + default: + { + /* Maybe the irq was acked by sw before we got a + change to take it. */ + if (env->interrupt_request & CPU_INTERRUPT_HARD) { + if (!env->pending_interrupts) + return; + if (!(env->pregs[SR_CCS] & I_FLAG)) { + return; + } + + irqnum = 31 - + __builtin_clz(env->pending_interrupts); + irqnum += 0x30; + ebp = env->pregs[SR_EBP]; + isr = ldl_code(ebp + irqnum * 4); + env->pregs[SR_ERP] = env->pc; + env->pc = isr; + + cris_shift_ccs(env); +#if 0 + printf ("%s ebp=%x %x isr=%x %d" + " ir=%x pending=%x\n", + __func__, + ebp, ebp + irqnum * 4, + isr, env->exception_index, + env->interrupt_request, + env->pending_interrupts); +#endif + } + + } + break; + } +} + +target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr) +{ +// printf ("%s\n", __func__); + uint32_t phy = addr; + struct cris_mmu_result_t res; + int miss; + miss = cris_mmu_translate(&res, env, addr, 0, 0); + if (!miss) + phy = res.phy; + return phy; +} +#endif |