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Simplify TCG relocation bugfix. 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3974 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2008-02-10 14:09:09 +00:00
parent b2a5160c9f
commit 623e265c6b
5 changed files with 12 additions and 17 deletions
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2
tcg/i386/tcg-target.c
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@ -318,7 +318,7 @@ static void tcg_out_jxx(TCGContext *s, int opc, int label_index)
tcg_out8(s, 0x80 + opc);
}
tcg_out_reloc(s, s->code_ptr, R_386_PC32, label_index, -4);
tcg_out32(s, -4);
s->code_ptr += 4;
}
}

21
tcg/tcg.c
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@ -97,9 +97,9 @@ void tcg_out_reloc(TCGContext *s, uint8_t *code_ptr, int type,
l = &s->labels[label_index];
if (l->has_value) {
/* FIXME: This is wrong. We can not resolve the relocation
immediately because the caller has not yet written the
initial value. */
/* FIXME: This may break relocations on RISC targets that
modify instruction fields in place. The caller may not have
written the initial value. */
patch_reloc(code_ptr, type, l->u.value + addend);
} else {
/* add a new relocation entry */
@ -1810,16 +1810,11 @@ int dyngen_code(TCGContext *s, uint8_t *gen_code_buf)
return s->code_ptr - gen_code_buf;
}
static uint8_t *dummy_code_buf;
/* Return the index of the micro operation such as the pc after is <
offset bytes from the start of the TB.
We have to use a dummy code buffer here to avoid clobbering the
oringinal code. Because we terminate code generation part way through
we can end up with unresolved relocations. Return -1 if not found. */
int dyngen_code_search_pc(TCGContext *s, long offset)
offset bytes from the start of the TB. The contents of gen_code_buf must
not be changed, though writing the same values is ok.
Return -1 if not found. */
int dyngen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset)
{
if (!dummy_code_buf)
dummy_code_buf = qemu_malloc(code_gen_max_block_size());
return tcg_gen_code_common(s, dummy_code_buf, offset);
return tcg_gen_code_common(s, gen_code_buf, offset);
}

2
tcg/tcg.h
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@ -257,7 +257,7 @@ void tcg_context_init(TCGContext *s);
void tcg_func_start(TCGContext *s);
int dyngen_code(TCGContext *s, uint8_t *gen_code_buf);
int dyngen_code_search_pc(TCGContext *s, long offset);
int dyngen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset);
void tcg_set_frame(TCGContext *s, int reg,
tcg_target_long start, tcg_target_long size);

2
tcg/x86_64/tcg-target.c
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@ -431,7 +431,7 @@ static void tcg_out_jxx(TCGContext *s, int opc, int label_index)
tcg_out8(s, 0x80 + opc);
}
tcg_out_reloc(s, s->code_ptr, R_386_PC32, label_index, -4);
tcg_out32(s, -4);
s->code_ptr += 4;
}
}

2
translate-all.c
View File

@ -187,7 +187,7 @@ int cpu_restore_state(TranslationBlock *tb,
s->tb_jmp_offset = NULL;
s->tb_next = tb->tb_next;
#endif
j = dyngen_code_search_pc(s, searched_pc - tc_ptr);
j = dyngen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
if (j < 0)
return -1;
/* now find start of instruction before */