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/*
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* internal execution defines for qemu
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define GEN_FLAG_CODE32_SHIFT 0 |
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#define GEN_FLAG_ADDSEG_SHIFT 1 |
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#define GEN_FLAG_SS32_SHIFT 2 |
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#define GEN_FLAG_VM_SHIFT 3 |
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#define GEN_FLAG_ST_SHIFT 4 |
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#define GEN_FLAG_TF_SHIFT 8 /* same position as eflags */ |
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#define GEN_FLAG_CPL_SHIFT 9 |
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#define GEN_FLAG_IOPL_SHIFT 12 /* same position as eflags */ |
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struct TranslationBlock;
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int cpu_x86_gen_code(struct TranslationBlock *tb, |
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int max_code_size, int *gen_code_size_ptr); |
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int cpu_x86_search_pc(struct TranslationBlock *tb, |
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uint32_t *found_pc, unsigned long searched_pc); |
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void cpu_x86_tblocks_init(void); |
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void page_init(void); |
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int page_unprotect(unsigned long address); |
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#define CODE_GEN_MAX_SIZE 65536 |
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#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */ |
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#define CODE_GEN_HASH_BITS 15 |
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#define CODE_GEN_HASH_SIZE (1 << CODE_GEN_HASH_BITS) |
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/* maximum total translate dcode allocated */
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#define CODE_GEN_BUFFER_SIZE (2048 * 1024) |
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//#define CODE_GEN_BUFFER_SIZE (128 * 1024)
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#if defined(__powerpc__)
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#define USE_DIRECT_JUMP
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#endif
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typedef struct TranslationBlock { |
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unsigned long pc; /* simulated PC corresponding to this block (EIP + CS base) */ |
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unsigned long cs_base; /* CS base for this block */ |
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unsigned int flags; /* flags defining in which context the code was generated */ |
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uint16_t size; /* size of target code for this block (1 <=
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size <= TARGET_PAGE_SIZE) */
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uint8_t *tc_ptr; /* pointer to the translated code */
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struct TranslationBlock *hash_next; /* next matching block */ |
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struct TranslationBlock *page_next[2]; /* next blocks in even/odd page */ |
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/* the following data are used to directly call another TB from
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the code of this one. */
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uint16_t tb_next_offset[2]; /* offset of original jump target */ |
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#ifdef USE_DIRECT_JUMP
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uint16_t tb_jmp_offset[2]; /* offset of jump instruction */ |
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#else
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uint8_t *tb_next[2]; /* address of jump generated code */ |
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#endif
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/* list of TBs jumping to this one. This is a circular list using
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the two least significant bits of the pointers to tell what is
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the next pointer: 0 = jmp_next[0], 1 = jmp_next[1], 2 =
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jmp_first */
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struct TranslationBlock *jmp_next[2]; |
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struct TranslationBlock *jmp_first;
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} TranslationBlock; |
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static inline unsigned int tb_hash_func(unsigned long pc) |
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{ |
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return pc & (CODE_GEN_HASH_SIZE - 1); |
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} |
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TranslationBlock *tb_alloc(unsigned long pc); |
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void tb_flush(void); |
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void tb_link(TranslationBlock *tb);
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extern TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE];
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extern uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];
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extern uint8_t *code_gen_ptr;
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/* find a translation block in the translation cache. If not found,
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return NULL and the pointer to the last element of the list in pptb */
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static inline TranslationBlock *tb_find(TranslationBlock ***pptb, |
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unsigned long pc, |
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unsigned long cs_base, |
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unsigned int flags) |
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{ |
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TranslationBlock **ptb, *tb; |
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unsigned int h; |
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h = tb_hash_func(pc); |
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ptb = &tb_hash[h]; |
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for(;;) {
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tb = *ptb; |
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if (!tb)
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break;
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if (tb->pc == pc && tb->cs_base == cs_base && tb->flags == flags)
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return tb;
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ptb = &tb->hash_next; |
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} |
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*pptb = ptb; |
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return NULL; |
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} |
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#if defined(__powerpc__)
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static inline void tb_set_jmp_target(TranslationBlock *tb, |
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int n, unsigned long addr) |
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{ |
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uint32_t val, *ptr; |
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unsigned long offset; |
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offset = (unsigned long)(tb->tc_ptr + tb->tb_jmp_offset[n]); |
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/* patch the branch destination */
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ptr = (uint32_t *)offset; |
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val = *ptr; |
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val = (val & ~0x03fffffc) | ((addr - offset) & 0x03fffffc); |
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*ptr = val; |
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/* flush icache */
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asm volatile ("dcbst 0,%0" : : "r"(ptr) : "memory"); |
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asm volatile ("sync" : : : "memory"); |
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asm volatile ("icbi 0,%0" : : "r"(ptr) : "memory"); |
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asm volatile ("sync" : : : "memory"); |
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asm volatile ("isync" : : : "memory"); |
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} |
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#else
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/* set the jump target */
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static inline void tb_set_jmp_target(TranslationBlock *tb, |
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int n, unsigned long addr) |
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{ |
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tb->tb_next[n] = (void *)addr;
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} |
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#endif
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static inline void tb_add_jump(TranslationBlock *tb, int n, |
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TranslationBlock *tb_next) |
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{ |
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/* NOTE: this test is only needed for thread safety */
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if (!tb->jmp_next[n]) {
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/* patch the native jump address */
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tb_set_jmp_target(tb, n, (unsigned long)tb_next->tc_ptr); |
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/* add in TB jmp circular list */
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tb->jmp_next[n] = tb_next->jmp_first; |
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tb_next->jmp_first = (TranslationBlock *)((long)(tb) | (n));
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} |
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} |
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TranslationBlock *tb_find_pc(unsigned long pc_ptr); |
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#ifndef offsetof
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#define offsetof(type, field) ((size_t) &((type *)0)->field) |
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#endif
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#ifdef __powerpc__
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static inline int testandset (int *p) |
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{ |
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int ret;
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__asm__ __volatile__ ( |
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"0: lwarx %0,0,%1 ;"
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" xor. %0,%3,%0;"
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" bne 1f;"
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" stwcx. %2,0,%1;"
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" bne- 0b;"
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"1: "
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: "=&r" (ret)
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: "r" (p), "r" (1), "r" (0) |
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: "cr0", "memory"); |
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return ret;
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} |
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#endif
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#ifdef __i386__
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static inline int testandset (int *p) |
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{ |
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char ret;
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long int readval; |
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__asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
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: "=q" (ret), "=m" (*p), "=a" (readval) |
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: "r" (1), "m" (*p), "a" (0) |
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: "memory");
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return ret;
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} |
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#endif
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#ifdef __s390__
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static inline int testandset (int *p) |
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{ |
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int ret;
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__asm__ __volatile__ ("0: cs %0,%1,0(%2)\n"
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" jl 0b"
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: "=&d" (ret)
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: "r" (1), "a" (p), "0" (*p) |
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: "cc", "memory" ); |
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return ret;
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} |
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#endif
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#ifdef __alpha__
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int testandset (int *p) |
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{ |
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int ret;
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unsigned long one; |
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__asm__ __volatile__ ("0: mov 1,%2\n"
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" ldl_l %0,%1\n"
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" stl_c %2,%1\n"
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" beq %2,1f\n"
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".subsection 2\n"
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"1: br 0b\n"
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".previous"
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: "=r" (ret), "=m" (*p), "=r" (one) |
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: "m" (*p));
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return ret;
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} |
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#endif
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#ifdef __sparc__
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static inline int testandset (int *p) |
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{ |
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int ret;
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__asm__ __volatile__("ldstub [%1], %0"
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: "=r" (ret)
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: "r" (p)
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: "memory");
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return (ret ? 1 : 0); |
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} |
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#endif
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typedef int spinlock_t; |
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#define SPIN_LOCK_UNLOCKED 0 |
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static inline void spin_lock(spinlock_t *lock) |
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{ |
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while (testandset(lock));
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} |
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static inline void spin_unlock(spinlock_t *lock) |
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{ |
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*lock = 0;
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} |
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static inline int spin_trylock(spinlock_t *lock) |
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{ |
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return !testandset(lock);
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} |
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extern spinlock_t tb_lock;
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