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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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12
dyngen-exec.h
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@ -19,7 +19,12 @@
#if !defined(__DYNGEN_EXEC_H__)
#define __DYNGEN_EXEC_H__
#if defined(__i386__)
#if defined(CONFIG_TCG_INTERPRETER)
/* The TCG interpreter does not need a special register AREG0,
* but it is possible to use one by defining AREG0.
* On i386, register edi seems to work. */
/* Run without special register AREG0 or use a value defined elsewhere. */
#elif defined(__i386__)
#define AREG0 "ebp"
#elif defined(__x86_64__)
#define AREG0 "r14"
@ -55,6 +60,11 @@
#error unsupported CPU
#endif
#if defined(AREG0)
register CPUState *env asm(AREG0);
#else
/* TODO: Try env = cpu_single_env. */
extern CPUState *env;
#endif
#endif /* !defined(__DYNGEN_EXEC_H__) */