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tcg: workaround branch instruction overflow in tcg_out_qemu_ld/st

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ppc64 uses a BC instruction to call the tcg_out_qemu_ld/st
slow path. BC instruction uses a relative address encoded
on 14 bits.

The slow path functions are added at the end of the generated
instructions buffer, in the reverse order of the callers.
So more we have slow path functions more the distance between
the caller (BC) and the function increases.

This patch changes the behavior to generate the functions in
the same order of the callers.

Backports commit 6001f7729e12dd1d810291e4cbf83cee8e07441d from qemu
This commit is contained in:
Laurent Vivier 2018-05-03 15:08:59 -04:00 committed by Lioncash
parent 2150745db4
commit ec12091943
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 6 additions and 6 deletions
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8
qemu/tcg/tcg-ldst.inc.c
View file

@ -30,7 +30,7 @@ typedef struct TCGLabelQemuLdst {
TCGReg datahi_reg; /* reg index for high word to be loaded or stored */
tcg_insn_unit *raddr; /* gen code addr of the next IR of qemu_ld/st IR */
tcg_insn_unit *label_ptr[2]; /* label pointers to be updated */
struct TCGLabelQemuLdst *next;
QSIMPLEQ_ENTRY(TCGLabelQemuLdst) next;
} TCGLabelQemuLdst;
/*
@ -45,7 +45,7 @@ static bool tcg_out_ldst_finalize(TCGContext *s)
TCGLabelQemuLdst *lb;
/* qemu_ld/st slow paths */
for (lb = s->ldst_labels; lb != NULL; lb = lb->next) {
QSIMPLEQ_FOREACH(lb, &s->ldst_labels, next) {
if (lb->is_ld) {
tcg_out_qemu_ld_slow_path(s, lb);
} else {
@ -71,7 +71,7 @@ static inline TCGLabelQemuLdst *new_ldst_label(TCGContext *s)
{
TCGLabelQemuLdst *l = tcg_malloc(s, sizeof(*l));
l->next = s->ldst_labels;
s->ldst_labels = l;
QSIMPLEQ_INSERT_TAIL(&s->ldst_labels, l, next);
return l;
}

2
qemu/tcg/tcg.c
View file

@ -2968,7 +2968,7 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb)
s->code_ptr = tb->tc.ptr;
#ifdef TCG_TARGET_NEED_LDST_LABELS
s->ldst_labels = NULL;
QSIMPLEQ_INIT(&s->ldst_labels);
#endif
#ifdef TCG_TARGET_NEED_POOL_LABELS
s->pool_labels = NULL;

2
qemu/tcg/tcg.h
View file

@ -787,7 +787,7 @@ struct TCGContext {
/* These structures are private to tcg-target.inc.c. */
#ifdef TCG_TARGET_NEED_LDST_LABELS
struct TCGLabelQemuLdst *ldst_labels;
QSIMPLEQ_HEAD(ldst_labels, TCGLabelQemuLdst) ldst_labels;
#endif
#ifdef TCG_TARGET_NEED_POOL_LABELS
struct TCGLabelPoolData *pool_labels;