Annotation of qemu/target-m68k/op_helper.c, revision 1.1.1.5

1.1       root        1: /*
                      2:  *  M68K helper routines
                      3:  *
                      4:  *  Copyright (c) 2007 CodeSourcery
                      5:  *
                      6:  * This library is free software; you can redistribute it and/or
                      7:  * modify it under the terms of the GNU Lesser General Public
                      8:  * License as published by the Free Software Foundation; either
                      9:  * version 2 of the License, or (at your option) any later version.
                     10:  *
                     11:  * This library is distributed in the hope that it will be useful,
                     12:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
                     13:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     14:  * Lesser General Public License for more details.
                     15:  *
                     16:  * You should have received a copy of the GNU Lesser General Public
1.1.1.3   root       17:  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
1.1       root       18:  */
1.1.1.5 ! root       19: #include "cpu.h"
        !            20: #include "dyngen-exec.h"
1.1.1.2   root       21: #include "helpers.h"
1.1       root       22: 
                     23: #if defined(CONFIG_USER_ONLY)
                     24: 
1.1.1.4   root       25: void do_interrupt(CPUState *env1)
                     26: {
                     27:     env1->exception_index = -1;
                     28: }
                     29: 
                     30: void do_interrupt_m68k_hardirq(CPUState *env1)
1.1       root       31: {
                     32: }
                     33: 
                     34: #else
                     35: 
                     36: extern int semihosting_enabled;
                     37: 
1.1.1.5 ! root       38: #include "softmmu_exec.h"
        !            39: 
1.1       root       40: #define MMUSUFFIX _mmu
                     41: 
                     42: #define SHIFT 0
                     43: #include "softmmu_template.h"
                     44: 
                     45: #define SHIFT 1
                     46: #include "softmmu_template.h"
                     47: 
                     48: #define SHIFT 2
                     49: #include "softmmu_template.h"
                     50: 
                     51: #define SHIFT 3
                     52: #include "softmmu_template.h"
                     53: 
                     54: /* Try to fill the TLB and return an exception if error. If retaddr is
                     55:    NULL, it means that the function was called in C code (i.e. not
                     56:    from generated code or from helper.c) */
                     57: /* XXX: fix it to restore all registers */
1.1.1.5 ! root       58: void tlb_fill(CPUState *env1, target_ulong addr, int is_write, int mmu_idx,
        !            59:               void *retaddr)
1.1       root       60: {
                     61:     TranslationBlock *tb;
                     62:     CPUState *saved_env;
                     63:     unsigned long pc;
                     64:     int ret;
                     65: 
                     66:     saved_env = env;
1.1.1.5 ! root       67:     env = env1;
        !            68:     ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, mmu_idx);
1.1.1.2   root       69:     if (unlikely(ret)) {
1.1       root       70:         if (retaddr) {
                     71:             /* now we have a real cpu fault */
                     72:             pc = (unsigned long)retaddr;
                     73:             tb = tb_find_pc(pc);
                     74:             if (tb) {
                     75:                 /* the PC is inside the translated code. It means that we have
                     76:                    a virtual CPU fault */
1.1.1.4   root       77:                 cpu_restore_state(tb, env, pc);
1.1       root       78:             }
                     79:         }
1.1.1.4   root       80:         cpu_loop_exit(env);
1.1       root       81:     }
                     82:     env = saved_env;
                     83: }
                     84: 
                     85: static void do_rte(void)
                     86: {
                     87:     uint32_t sp;
                     88:     uint32_t fmt;
                     89: 
                     90:     sp = env->aregs[7];
                     91:     fmt = ldl_kernel(sp);
                     92:     env->pc = ldl_kernel(sp + 4);
                     93:     sp |= (fmt >> 28) & 3;
                     94:     env->sr = fmt & 0xffff;
                     95:     m68k_switch_sp(env);
                     96:     env->aregs[7] = sp + 8;
                     97: }
                     98: 
1.1.1.4   root       99: static void do_interrupt_all(int is_hw)
1.1       root      100: {
                    101:     uint32_t sp;
                    102:     uint32_t fmt;
                    103:     uint32_t retaddr;
                    104:     uint32_t vector;
                    105: 
                    106:     fmt = 0;
                    107:     retaddr = env->pc;
                    108: 
                    109:     if (!is_hw) {
                    110:         switch (env->exception_index) {
                    111:         case EXCP_RTE:
                    112:             /* Return from an exception.  */
                    113:             do_rte();
                    114:             return;
                    115:         case EXCP_HALT_INSN:
                    116:             if (semihosting_enabled
                    117:                     && (env->sr & SR_S) != 0
                    118:                     && (env->pc & 3) == 0
                    119:                     && lduw_code(env->pc - 4) == 0x4e71
                    120:                     && ldl_code(env->pc) == 0x4e7bf000) {
                    121:                 env->pc += 4;
                    122:                 do_m68k_semihosting(env, env->dregs[0]);
                    123:                 return;
                    124:             }
                    125:             env->halted = 1;
                    126:             env->exception_index = EXCP_HLT;
1.1.1.4   root      127:             cpu_loop_exit(env);
1.1       root      128:             return;
                    129:         }
                    130:         if (env->exception_index >= EXCP_TRAP0
                    131:             && env->exception_index <= EXCP_TRAP15) {
                    132:             /* Move the PC after the trap instruction.  */
                    133:             retaddr += 2;
                    134:         }
                    135:     }
                    136: 
                    137:     vector = env->exception_index << 2;
                    138: 
                    139:     sp = env->aregs[7];
                    140: 
                    141:     fmt |= 0x40000000;
                    142:     fmt |= (sp & 3) << 28;
                    143:     fmt |= vector << 16;
                    144:     fmt |= env->sr;
                    145: 
                    146:     env->sr |= SR_S;
                    147:     if (is_hw) {
                    148:         env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT);
                    149:         env->sr &= ~SR_M;
                    150:     }
                    151:     m68k_switch_sp(env);
                    152: 
                    153:     /* ??? This could cause MMU faults.  */
                    154:     sp &= ~3;
                    155:     sp -= 4;
                    156:     stl_kernel(sp, retaddr);
                    157:     sp -= 4;
                    158:     stl_kernel(sp, fmt);
                    159:     env->aregs[7] = sp;
                    160:     /* Jump to vector.  */
                    161:     env->pc = ldl_kernel(env->vbr + vector);
                    162: }
                    163: 
1.1.1.4   root      164: void do_interrupt(CPUState *env1)
                    165: {
                    166:     CPUState *saved_env;
                    167: 
                    168:     saved_env = env;
                    169:     env = env1;
                    170:     do_interrupt_all(0);
                    171:     env = saved_env;
                    172: }
                    173: 
                    174: void do_interrupt_m68k_hardirq(CPUState *env1)
                    175: {
                    176:     CPUState *saved_env;
                    177: 
                    178:     saved_env = env;
                    179:     env = env1;
                    180:     do_interrupt_all(1);
                    181:     env = saved_env;
                    182: }
1.1       root      183: #endif
1.1.1.2   root      184: 
                    185: static void raise_exception(int tt)
                    186: {
                    187:     env->exception_index = tt;
1.1.1.4   root      188:     cpu_loop_exit(env);
1.1.1.2   root      189: }
                    190: 
                    191: void HELPER(raise_exception)(uint32_t tt)
                    192: {
                    193:     raise_exception(tt);
                    194: }
                    195: 
                    196: void HELPER(divu)(CPUState *env, uint32_t word)
                    197: {
                    198:     uint32_t num;
                    199:     uint32_t den;
                    200:     uint32_t quot;
                    201:     uint32_t rem;
                    202:     uint32_t flags;
                    203: 
                    204:     num = env->div1;
                    205:     den = env->div2;
                    206:     /* ??? This needs to make sure the throwing location is accurate.  */
                    207:     if (den == 0)
                    208:         raise_exception(EXCP_DIV0);
                    209:     quot = num / den;
                    210:     rem = num % den;
                    211:     flags = 0;
                    212:     /* Avoid using a PARAM1 of zero.  This breaks dyngen because it uses
                    213:        the address of a symbol, and gcc knows symbols can't have address
                    214:        zero.  */
                    215:     if (word && quot > 0xffff)
                    216:         flags |= CCF_V;
                    217:     if (quot == 0)
                    218:         flags |= CCF_Z;
                    219:     else if ((int32_t)quot < 0)
                    220:         flags |= CCF_N;
                    221:     env->div1 = quot;
                    222:     env->div2 = rem;
                    223:     env->cc_dest = flags;
                    224: }
                    225: 
                    226: void HELPER(divs)(CPUState *env, uint32_t word)
                    227: {
                    228:     int32_t num;
                    229:     int32_t den;
                    230:     int32_t quot;
                    231:     int32_t rem;
                    232:     int32_t flags;
                    233: 
                    234:     num = env->div1;
                    235:     den = env->div2;
                    236:     if (den == 0)
                    237:         raise_exception(EXCP_DIV0);
                    238:     quot = num / den;
                    239:     rem = num % den;
                    240:     flags = 0;
                    241:     if (word && quot != (int16_t)quot)
                    242:         flags |= CCF_V;
                    243:     if (quot == 0)
                    244:         flags |= CCF_Z;
                    245:     else if (quot < 0)
                    246:         flags |= CCF_N;
                    247:     env->div1 = quot;
                    248:     env->div2 = rem;
                    249:     env->cc_dest = flags;
                    250: }

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