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tcg: Add bytecode generator for tcg interpreter

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Unlike other tcg target code generators, this one does not generate
machine code for some cpu. It generates machine independent bytecode
which is interpreted later.

This allows running QEMU on any host.

Interpreted bytecode is slower than direct execution of generated
machine code.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
This commit is contained in:
Stefan Weil 2011-10-05 20:03:02 +02:00 • committed by Stefan Weil
parent 2a24374ab6
commit 7316329aa5
5 changed files with 1227 additions and 3 deletions
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22
exec-all.h
View file

@ -122,6 +122,8 @@ void tlb_set_page(CPUState *env, target_ulong vaddr,
#if defined(_ARCH_PPC) || defined(__x86_64__) || defined(__arm__) || defined(__i386__)
#define USE_DIRECT_JUMP
#elif defined(CONFIG_TCG_INTERPRETER)
#define USE_DIRECT_JUMP
#endif
struct TranslationBlock {
@ -189,7 +191,14 @@ extern TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
#if defined(USE_DIRECT_JUMP)
#if defined(_ARCH_PPC)
#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__)
@ -223,6 +232,8 @@ static inline void tb_set_jmp_target1(unsigned long jmp_addr, unsigned long addr
__asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
#endif
}
#else
#error tb_set_jmp_target1 is missing
#endif
static inline void tb_set_jmp_target(TranslationBlock *tb,
@ -269,7 +280,14 @@ extern int tb_invalidated_flag;
/* The return address may point to the start of the next instruction.
Subtracting one gets us the call instruction itself. */
#if defined(__s390__) && !defined(__s390x__)
#if defined(CONFIG_TCG_INTERPRETER)
/* Alpha and SH4 user mode emulations and Softmmu call GETPC().
For all others, GETPC remains undefined (which makes TCI a little faster. */
# if defined(CONFIG_SOFTMMU) || defined(TARGET_ALPHA) || defined(TARGET_SH4)
extern void *tci_tb_ptr;
# define GETPC() tci_tb_ptr
# endif
#elif defined(__s390__) && !defined(__s390x__)
# define GETPC() ((void*)(((unsigned long)__builtin_return_address(0) & 0x7fffffffUL) - 1))
#elif defined(__arm__)
/* Thumb return addresses have the low bit set, so we need to subtract two.