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Fix code generation buffer overflow reported by TeLeMan 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3805 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
blueswir1 2007-12-11 19:35:45 +00:00
parent 52df269ca8
commit d07bde88a5
4 changed files with 20 additions and 7 deletions
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2
cpu-exec.c
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@ -133,7 +133,7 @@ static TranslationBlock *tb_find_slow(target_ulong pc,
tb->tc_ptr = tc_ptr;
tb->cs_base = cs_base;
tb->flags = flags;
cpu_gen_code(env, tb, CODE_GEN_MAX_SIZE, &code_gen_size);
cpu_gen_code(env, tb, &code_gen_size);
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
/* check next page if needed */

4
exec-all.h
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@ -64,8 +64,9 @@ extern int loglevel;
int gen_intermediate_code(CPUState *env, struct TranslationBlock *tb);
int gen_intermediate_code_pc(CPUState *env, struct TranslationBlock *tb);
void dump_ops(const uint16_t *opc_buf, const uint32_t *opparam_buf);
unsigned long code_gen_max_block_size(void);
int cpu_gen_code(CPUState *env, struct TranslationBlock *tb,
int max_code_size, int *gen_code_size_ptr);
int *gen_code_size_ptr);
int cpu_restore_state(struct TranslationBlock *tb,
CPUState *env, unsigned long searched_pc,
void *puc);
@ -94,7 +95,6 @@ static inline int tlb_set_page(CPUState *env, target_ulong vaddr,
return tlb_set_page_exec(env, vaddr, paddr, prot, mmu_idx, is_softmmu);
}
#define CODE_GEN_MAX_SIZE 65536
#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */
#define CODE_GEN_PHYS_HASH_BITS 15

4
exec.c
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@ -56,7 +56,7 @@
#endif
/* threshold to flush the translated code buffer */
#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE)
#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - code_gen_max_block_size())
#define SMC_BITMAP_USE_THRESHOLD 10
@ -622,7 +622,7 @@ static void tb_gen_code(CPUState *env,
tb->cs_base = cs_base;
tb->flags = flags;
tb->cflags = cflags;
cpu_gen_code(env, tb, CODE_GEN_MAX_SIZE, &code_gen_size);
cpu_gen_code(env, tb, &code_gen_size);
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
/* check next page if needed */

17
translate-all.c
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@ -132,14 +132,27 @@ static void dyngen_labels(long *gen_labels, int nb_gen_labels,
}
}
unsigned long code_gen_max_block_size(void)
{
static unsigned long max;
if (max == 0) {
#define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
#include "opc.h"
#undef DEF
max *= OPC_MAX_SIZE;
}
return max;
}
/* return non zero if the very first instruction is invalid so that
the virtual CPU can trigger an exception.
'*gen_code_size_ptr' contains the size of the generated code (host
code).
*/
int cpu_gen_code(CPUState *env, TranslationBlock *tb,
int max_code_size, int *gen_code_size_ptr)
int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
{
uint8_t *gen_code_buf;
int gen_code_size;