Signed-off-by: Xuebing Wang <xbi...@gmail.com> --- include/exec/exec-all.h | 302 +-------------------------------------------- include/exec/translate.h | 306 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 307 insertions(+), 301 deletions(-) create mode 100644 include/exec/translate.h
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h index a387922..68a888f 100644 --- a/include/exec/exec-all.h +++ b/include/exec/exec-all.h @@ -20,307 +20,7 @@ #ifndef _EXEC_ALL_H_ #define _EXEC_ALL_H_ -#include "qemu-common.h" - -/* allow to see translation results - the slowdown should be negligible, so we leave it */ -#define DEBUG_DISAS - -/* Page tracking code uses ram addresses in system mode, and virtual - addresses in userspace mode. Define tb_page_addr_t to be an appropriate - type. */ -#if defined(CONFIG_USER_ONLY) -typedef abi_ulong tb_page_addr_t; -#else -typedef ram_addr_t tb_page_addr_t; -#endif - -/* is_jmp field values */ -#define DISAS_NEXT 0 /* next instruction can be analyzed */ -#define DISAS_JUMP 1 /* only pc was modified dynamically */ -#define DISAS_UPDATE 2 /* cpu state was modified dynamically */ -#define DISAS_TB_JUMP 3 /* only pc was modified statically */ - -struct TranslationBlock; -typedef struct TranslationBlock TranslationBlock; - -/* XXX: make safe guess about sizes */ -#define MAX_OP_PER_INSTR 208 - -#if HOST_LONG_BITS == 32 -#define MAX_OPC_PARAM_PER_ARG 2 -#else -#define MAX_OPC_PARAM_PER_ARG 1 -#endif -#define MAX_OPC_PARAM_IARGS 5 -#define MAX_OPC_PARAM_OARGS 1 -#define MAX_OPC_PARAM_ARGS (MAX_OPC_PARAM_IARGS + MAX_OPC_PARAM_OARGS) - -/* A Call op needs up to 4 + 2N parameters on 32-bit archs, - * and up to 4 + N parameters on 64-bit archs - * (N = number of input arguments + output arguments). */ -#define MAX_OPC_PARAM (4 + (MAX_OPC_PARAM_PER_ARG * MAX_OPC_PARAM_ARGS)) -#define OPC_BUF_SIZE 640 -#define OPC_MAX_SIZE (OPC_BUF_SIZE - MAX_OP_PER_INSTR) - -/* Maximum size a TCG op can expand to. This is complicated because a - single op may require several host instructions and register reloads. - For now take a wild guess at 192 bytes, which should allow at least - a couple of fixup instructions per argument. */ -#define TCG_MAX_OP_SIZE 192 - -#define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * MAX_OPC_PARAM) - -#include "qemu/log.h" - -void gen_intermediate_code(CPUArchState *env, struct TranslationBlock *tb); -void gen_intermediate_code_pc(CPUArchState *env, struct TranslationBlock *tb); -void restore_state_to_opc(CPUArchState *env, struct TranslationBlock *tb, - int pc_pos); - -void cpu_gen_init(void); -int cpu_gen_code(CPUArchState *env, struct TranslationBlock *tb, - int *gen_code_size_ptr); -bool cpu_restore_state(CPUArchState *env, uintptr_t searched_pc); -void page_size_init(void); - -void QEMU_NORETURN cpu_resume_from_signal(CPUArchState *env1, void *puc); -void QEMU_NORETURN cpu_io_recompile(CPUArchState *env, uintptr_t retaddr); -TranslationBlock *tb_gen_code(CPUArchState *env, - target_ulong pc, target_ulong cs_base, int flags, - int cflags); -void cpu_exec_init(CPUArchState *env); -void QEMU_NORETURN cpu_loop_exit(CPUArchState *env1); -int page_unprotect(target_ulong address, uintptr_t pc, void *puc); -void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end, - int is_cpu_write_access); -void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end, - int is_cpu_write_access); -#if !defined(CONFIG_USER_ONLY) -void tcg_cpu_address_space_init(CPUState *cpu, AddressSpace *as); -/* cputlb.c */ -void tlb_flush_page(CPUArchState *env, target_ulong addr); -void tlb_flush(CPUArchState *env, int flush_global); -void tlb_set_page(CPUArchState *env, target_ulong vaddr, - hwaddr paddr, int prot, - int mmu_idx, target_ulong size); -void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr); -#else -static inline void tlb_flush_page(CPUArchState *env, target_ulong addr) -{ -} - -static inline void tlb_flush(CPUArchState *env, int flush_global) -{ -} -#endif - -#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */ - -#define CODE_GEN_PHYS_HASH_BITS 15 -#define CODE_GEN_PHYS_HASH_SIZE (1 << CODE_GEN_PHYS_HASH_BITS) - -/* estimated block size for TB allocation */ -/* XXX: use a per code average code fragment size and modulate it - according to the host CPU */ -#if defined(CONFIG_SOFTMMU) -#define CODE_GEN_AVG_BLOCK_SIZE 128 -#else -#define CODE_GEN_AVG_BLOCK_SIZE 64 -#endif - -#if defined(__arm__) || defined(_ARCH_PPC) \ - || defined(__x86_64__) || defined(__i386__) \ - || defined(__sparc__) || defined(__aarch64__) \ - || defined(CONFIG_TCG_INTERPRETER) -#define USE_DIRECT_JUMP -#endif - -struct TranslationBlock { - target_ulong pc; /* simulated PC corresponding to this block (EIP + CS base) */ - target_ulong cs_base; /* CS base for this block */ - uint64_t flags; /* flags defining in which context the code was generated */ - uint16_t size; /* size of target code for this block (1 <= - size <= TARGET_PAGE_SIZE) */ - uint16_t cflags; /* compile flags */ -#define CF_COUNT_MASK 0x7fff -#define CF_LAST_IO 0x8000 /* Last insn may be an IO access. */ - - uint8_t *tc_ptr; /* pointer to the translated code */ - /* next matching tb for physical address. */ - struct TranslationBlock *phys_hash_next; - /* first and second physical page containing code. The lower bit - of the pointer tells the index in page_next[] */ - struct TranslationBlock *page_next[2]; - tb_page_addr_t page_addr[2]; - - /* the following data are used to directly call another TB from - the code of this one. */ - uint16_t tb_next_offset[2]; /* offset of original jump target */ -#ifdef USE_DIRECT_JUMP - uint16_t tb_jmp_offset[2]; /* offset of jump instruction */ -#else - uintptr_t tb_next[2]; /* address of jump generated code */ -#endif - /* list of TBs jumping to this one. This is a circular list using - the two least significant bits of the pointers to tell what is - the next pointer: 0 = jmp_next[0], 1 = jmp_next[1], 2 = - jmp_first */ - struct TranslationBlock *jmp_next[2]; - struct TranslationBlock *jmp_first; - uint32_t icount; -}; - -#include "exec/spinlock.h" - -typedef struct TBContext TBContext; - -struct TBContext { - - TranslationBlock *tbs; - TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE]; - int nb_tbs; - /* any access to the tbs or the page table must use this lock */ - spinlock_t tb_lock; - - /* statistics */ - int tb_flush_count; - int tb_phys_invalidate_count; - - int tb_invalidated_flag; -}; - -static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc) -{ - target_ulong tmp; - tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)); - return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK; -} - -static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc) -{ - target_ulong tmp; - tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)); - return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK) - | (tmp & TB_JMP_ADDR_MASK)); -} - -static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc) -{ - return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1); -} - -void tb_free(TranslationBlock *tb); -void tb_flush(CPUArchState *env); -void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr); - -#if defined(USE_DIRECT_JUMP) - -#if defined(CONFIG_TCG_INTERPRETER) -static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr) -{ - /* patch the branch destination */ - *(uint32_t *)jmp_addr = addr - (jmp_addr + 4); - /* no need to flush icache explicitly */ -} -#elif defined(_ARCH_PPC) -void ppc_tb_set_jmp_target(unsigned long jmp_addr, unsigned long addr); -#define tb_set_jmp_target1 ppc_tb_set_jmp_target -#elif defined(__i386__) || defined(__x86_64__) -static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr) -{ - /* patch the branch destination */ - *(uint32_t *)jmp_addr = addr - (jmp_addr + 4); - /* no need to flush icache explicitly */ -} -#elif defined(__aarch64__) -void aarch64_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr); -#define tb_set_jmp_target1 aarch64_tb_set_jmp_target -#elif defined(__arm__) -static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr) -{ -#if !QEMU_GNUC_PREREQ(4, 1) - register unsigned long _beg __asm ("a1"); - register unsigned long _end __asm ("a2"); - register unsigned long _flg __asm ("a3"); -#endif - - /* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */ - *(uint32_t *)jmp_addr = - (*(uint32_t *)jmp_addr & ~0xffffff) - | (((addr - (jmp_addr + 8)) >> 2) & 0xffffff); - -#if QEMU_GNUC_PREREQ(4, 1) - __builtin___clear_cache((char *) jmp_addr, (char *) jmp_addr + 4); -#else - /* flush icache */ - _beg = jmp_addr; - _end = jmp_addr + 4; - _flg = 0; - __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg)); -#endif -} -#elif defined(__sparc__) -void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr); -#else -#error tb_set_jmp_target1 is missing -#endif - -static inline void tb_set_jmp_target(TranslationBlock *tb, - int n, uintptr_t addr) -{ - uint16_t offset = tb->tb_jmp_offset[n]; - tb_set_jmp_target1((uintptr_t)(tb->tc_ptr + offset), addr); -} - -#else - -/* set the jump target */ -static inline void tb_set_jmp_target(TranslationBlock *tb, - int n, uintptr_t addr) -{ - tb->tb_next[n] = addr; -} - -#endif - -static inline void tb_add_jump(TranslationBlock *tb, int n, - TranslationBlock *tb_next) -{ - /* NOTE: this test is only needed for thread safety */ - if (!tb->jmp_next[n]) { - /* patch the native jump address */ - tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc_ptr); - - /* add in TB jmp circular list */ - tb->jmp_next[n] = tb_next->jmp_first; - tb_next->jmp_first = (TranslationBlock *)((uintptr_t)(tb) | (n)); - } -} - -/* GETRA is the true target of the return instruction that we'll execute, - defined here for simplicity of defining the follow-up macros. */ -#if defined(CONFIG_TCG_INTERPRETER) -extern uintptr_t tci_tb_ptr; -# define GETRA() tci_tb_ptr -#else -# define GETRA() \ - ((uintptr_t)__builtin_extract_return_addr(__builtin_return_address(0))) -#endif - -/* The true return address will often point to a host insn that is part of - the next translated guest insn. Adjust the address backward to point to - the middle of the call insn. Subtracting one would do the job except for - several compressed mode architectures (arm, mips) which set the low bit - to indicate the compressed mode; subtracting two works around that. It - is also the case that there are no host isas that contain a call insn - smaller than 4 bytes, so we don't worry about special-casing this. */ -#if defined(CONFIG_TCG_INTERPRETER) -# define GETPC_ADJ 0 -#else -# define GETPC_ADJ 2 -#endif - -#define GETPC() (GETRA() - GETPC_ADJ) +#include "exec/translate.h" #if !defined(CONFIG_USER_ONLY) diff --git a/include/exec/translate.h b/include/exec/translate.h new file mode 100644 index 0000000..9e877f2 --- /dev/null +++ b/include/exec/translate.h @@ -0,0 +1,306 @@ +#ifndef EXEC_TRANSLATE_H +#define EXEC_TRANSLATE_H + +#include "qemu-common.h" + +/* allow to see translation results - the slowdown should be negligible, so we leave it */ +#define DEBUG_DISAS + +/* Page tracking code uses ram addresses in system mode, and virtual + addresses in userspace mode. Define tb_page_addr_t to be an appropriate + type. */ +#if defined(CONFIG_USER_ONLY) +typedef abi_ulong tb_page_addr_t; +#else +typedef ram_addr_t tb_page_addr_t; +#endif + +/* is_jmp field values */ +#define DISAS_NEXT 0 /* next instruction can be analyzed */ +#define DISAS_JUMP 1 /* only pc was modified dynamically */ +#define DISAS_UPDATE 2 /* cpu state was modified dynamically */ +#define DISAS_TB_JUMP 3 /* only pc was modified statically */ + +struct TranslationBlock; +typedef struct TranslationBlock TranslationBlock; + +/* XXX: make safe guess about sizes */ +#define MAX_OP_PER_INSTR 208 + +#if HOST_LONG_BITS == 32 +#define MAX_OPC_PARAM_PER_ARG 2 +#else +#define MAX_OPC_PARAM_PER_ARG 1 +#endif +#define MAX_OPC_PARAM_IARGS 5 +#define MAX_OPC_PARAM_OARGS 1 +#define MAX_OPC_PARAM_ARGS (MAX_OPC_PARAM_IARGS + MAX_OPC_PARAM_OARGS) + +/* A Call op needs up to 4 + 2N parameters on 32-bit archs, + * and up to 4 + N parameters on 64-bit archs + * (N = number of input arguments + output arguments). */ +#define MAX_OPC_PARAM (4 + (MAX_OPC_PARAM_PER_ARG * MAX_OPC_PARAM_ARGS)) +#define OPC_BUF_SIZE 640 +#define OPC_MAX_SIZE (OPC_BUF_SIZE - MAX_OP_PER_INSTR) + +/* Maximum size a TCG op can expand to. This is complicated because a + single op may require several host instructions and register reloads. + For now take a wild guess at 192 bytes, which should allow at least + a couple of fixup instructions per argument. */ +#define TCG_MAX_OP_SIZE 192 + +#define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * MAX_OPC_PARAM) + +#include "qemu/log.h" + +void gen_intermediate_code(CPUArchState *env, struct TranslationBlock *tb); +void gen_intermediate_code_pc(CPUArchState *env, struct TranslationBlock *tb); +void restore_state_to_opc(CPUArchState *env, struct TranslationBlock *tb, + int pc_pos); + +void cpu_gen_init(void); +int cpu_gen_code(CPUArchState *env, struct TranslationBlock *tb, + int *gen_code_size_ptr); +bool cpu_restore_state(CPUArchState *env, uintptr_t searched_pc); +void page_size_init(void); + +void QEMU_NORETURN cpu_resume_from_signal(CPUArchState *env1, void *puc); +void QEMU_NORETURN cpu_io_recompile(CPUArchState *env, uintptr_t retaddr); +TranslationBlock *tb_gen_code(CPUArchState *env, + target_ulong pc, target_ulong cs_base, int flags, + int cflags); +void cpu_exec_init(CPUArchState *env); +void QEMU_NORETURN cpu_loop_exit(CPUArchState *env1); +int page_unprotect(target_ulong address, uintptr_t pc, void *puc); +void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end, + int is_cpu_write_access); +void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end, + int is_cpu_write_access); +#if !defined(CONFIG_USER_ONLY) +void tcg_cpu_address_space_init(CPUState *cpu, AddressSpace *as); +/* cputlb.c */ +void tlb_flush_page(CPUArchState *env, target_ulong addr); +void tlb_flush(CPUArchState *env, int flush_global); +void tlb_set_page(CPUArchState *env, target_ulong vaddr, + hwaddr paddr, int prot, + int mmu_idx, target_ulong size); +void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr); +#else +static inline void tlb_flush_page(CPUArchState *env, target_ulong addr) +{ +} + +static inline void tlb_flush(CPUArchState *env, int flush_global) +{ +} +#endif + +#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */ + +#define CODE_GEN_PHYS_HASH_BITS 15 +#define CODE_GEN_PHYS_HASH_SIZE (1 << CODE_GEN_PHYS_HASH_BITS) + +/* estimated block size for TB allocation */ +/* XXX: use a per code average code fragment size and modulate it + according to the host CPU */ +#if defined(CONFIG_SOFTMMU) +#define CODE_GEN_AVG_BLOCK_SIZE 128 +#else +#define CODE_GEN_AVG_BLOCK_SIZE 64 +#endif + +#if defined(__arm__) || defined(_ARCH_PPC) \ + || defined(__x86_64__) || defined(__i386__) \ + || defined(__sparc__) || defined(__aarch64__) \ + || defined(CONFIG_TCG_INTERPRETER) +#define USE_DIRECT_JUMP +#endif + +struct TranslationBlock { + target_ulong pc; /* simulated PC corresponding to this block (EIP + CS base) */ + target_ulong cs_base; /* CS base for this block */ + uint64_t flags; /* flags defining in which context the code was generated */ + uint16_t size; /* size of target code for this block (1 <= + size <= TARGET_PAGE_SIZE) */ + uint16_t cflags; /* compile flags */ +#define CF_COUNT_MASK 0x7fff +#define CF_LAST_IO 0x8000 /* Last insn may be an IO access. */ + + uint8_t *tc_ptr; /* pointer to the translated code */ + /* next matching tb for physical address. */ + struct TranslationBlock *phys_hash_next; + /* first and second physical page containing code. The lower bit + of the pointer tells the index in page_next[] */ + struct TranslationBlock *page_next[2]; + tb_page_addr_t page_addr[2]; + + /* the following data are used to directly call another TB from + the code of this one. */ + uint16_t tb_next_offset[2]; /* offset of original jump target */ +#ifdef USE_DIRECT_JUMP + uint16_t tb_jmp_offset[2]; /* offset of jump instruction */ +#else + uintptr_t tb_next[2]; /* address of jump generated code */ +#endif + /* list of TBs jumping to this one. This is a circular list using + the two least significant bits of the pointers to tell what is + the next pointer: 0 = jmp_next[0], 1 = jmp_next[1], 2 = + jmp_first */ + struct TranslationBlock *jmp_next[2]; + struct TranslationBlock *jmp_first; + uint32_t icount; +}; + +#include "exec/spinlock.h" + +typedef struct TBContext TBContext; + +struct TBContext { + + TranslationBlock *tbs; + TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE]; + int nb_tbs; + /* any access to the tbs or the page table must use this lock */ + spinlock_t tb_lock; + + /* statistics */ + int tb_flush_count; + int tb_phys_invalidate_count; + + int tb_invalidated_flag; +}; + +static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc) +{ + target_ulong tmp; + tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)); + return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK; +} + +static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc) +{ + target_ulong tmp; + tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)); + return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK) + | (tmp & TB_JMP_ADDR_MASK)); +} + +static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc) +{ + return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1); +} + +void tb_free(TranslationBlock *tb); +void tb_flush(CPUArchState *env); +void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr); + +#if defined(USE_DIRECT_JUMP) + +#if defined(CONFIG_TCG_INTERPRETER) +static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr) +{ + /* patch the branch destination */ + *(uint32_t *)jmp_addr = addr - (jmp_addr + 4); + /* no need to flush icache explicitly */ +} +#elif defined(_ARCH_PPC) +void ppc_tb_set_jmp_target(unsigned long jmp_addr, unsigned long addr); +#define tb_set_jmp_target1 ppc_tb_set_jmp_target +#elif defined(__i386__) || defined(__x86_64__) +static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr) +{ + /* patch the branch destination */ + *(uint32_t *)jmp_addr = addr - (jmp_addr + 4); + /* no need to flush icache explicitly */ +} +#elif defined(__aarch64__) +void aarch64_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr); +#define tb_set_jmp_target1 aarch64_tb_set_jmp_target +#elif defined(__arm__) +static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr) +{ +#if !QEMU_GNUC_PREREQ(4, 1) + register unsigned long _beg __asm ("a1"); + register unsigned long _end __asm ("a2"); + register unsigned long _flg __asm ("a3"); +#endif + + /* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */ + *(uint32_t *)jmp_addr = + (*(uint32_t *)jmp_addr & ~0xffffff) + | (((addr - (jmp_addr + 8)) >> 2) & 0xffffff); + +#if QEMU_GNUC_PREREQ(4, 1) + __builtin___clear_cache((char *) jmp_addr, (char *) jmp_addr + 4); +#else + /* flush icache */ + _beg = jmp_addr; + _end = jmp_addr + 4; + _flg = 0; + __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg)); +#endif +} +#elif defined(__sparc__) +void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr); +#else +#error tb_set_jmp_target1 is missing +#endif + +static inline void tb_set_jmp_target(TranslationBlock *tb, + int n, uintptr_t addr) +{ + uint16_t offset = tb->tb_jmp_offset[n]; + tb_set_jmp_target1((uintptr_t)(tb->tc_ptr + offset), addr); +} + +#else + +/* set the jump target */ +static inline void tb_set_jmp_target(TranslationBlock *tb, + int n, uintptr_t addr) +{ + tb->tb_next[n] = addr; +} + +#endif + +static inline void tb_add_jump(TranslationBlock *tb, int n, + TranslationBlock *tb_next) +{ + /* NOTE: this test is only needed for thread safety */ + if (!tb->jmp_next[n]) { + /* patch the native jump address */ + tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc_ptr); + + /* add in TB jmp circular list */ + tb->jmp_next[n] = tb_next->jmp_first; + tb_next->jmp_first = (TranslationBlock *)((uintptr_t)(tb) | (n)); + } +} + +/* GETRA is the true target of the return instruction that we'll execute, + defined here for simplicity of defining the follow-up macros. */ +#if defined(CONFIG_TCG_INTERPRETER) +extern uintptr_t tci_tb_ptr; +# define GETRA() tci_tb_ptr +#else +# define GETRA() \ + ((uintptr_t)__builtin_extract_return_addr(__builtin_return_address(0))) +#endif + +/* The true return address will often point to a host insn that is part of + the next translated guest insn. Adjust the address backward to point to + the middle of the call insn. Subtracting one would do the job except for + several compressed mode architectures (arm, mips) which set the low bit + to indicate the compressed mode; subtracting two works around that. It + is also the case that there are no host isas that contain a call insn + smaller than 4 bytes, so we don't worry about special-casing this. */ +#if defined(CONFIG_TCG_INTERPRETER) +# define GETPC_ADJ 0 +#else +# define GETPC_ADJ 2 +#endif + +#define GETPC() (GETRA() - GETPC_ADJ) + +#endif /* EXEC_TRANSLATE_H */ -- 1.7.9.5