OpenE2K/qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

Fix translation for gUSA regions.

Browse Source 
-----BEGIN PGP SIGNATURE-----
 
 iQEcBAABAgAGBQJbQ59aAAoJEGTfOOivfiFfjDEH/05tn0lTv3nikEZTRxzP2x4E
 DTaq+yr6jew8UVKjn1B+vYEMGpTiT44CydMK1cYXYD5UorySl0Grihc7cGzYT/qt
 AfZapMx32ZIUsc2FQBMx/6bMQaqHWyedbhx83AD6aqM+EE8UJQuFyfISllrnU5hd
 fSkz8L163KmqMHveVP/FrBhn3dcqIxXSfFki59eZ0ZXuUKxD30qchljdHvtim387
 Fkyl5HPiM9zWA8oJ+LYnixDNId798Ps/VwyBkJlXhy73ioC46RqrFeci1uWKA1lZ
 5LAYim0DmF4WeFYS7bE9Ubwbr3m9UVXLmL7TxSUwgwCsnLqymsLD4XKCgRxD9Dw=
 =MCRa
 -----END PGP SIGNATURE-----

Merge remote-tracking branch 'remotes/rth/tags/pull-sh4-20180709' into staging

Fix translation for gUSA regions.

# gpg: Signature made Mon 09 Jul 2018 18:46:02 BST
# gpg:                using RSA key 64DF38E8AF7E215F
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>"
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-sh4-20180709:
  target/sh4: Fix translator.c assertion failure for gUSA

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-07-09 22:44:22 +01:00
commit b34181056c
1 changed files with 44 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
target/sh4/translate.c
View File

@ -1895,35 +1895,18 @@ static void decode_opc(DisasContext * ctx)
any sequence via cpu_exec_step_atomic, we can recognize the "normal"
sequences and transform them into atomic operations as seen by the host.
*/
static int decode_gusa(DisasContext *ctx, CPUSH4State *env, int *pmax_insns)
static void decode_gusa(DisasContext *ctx, CPUSH4State *env)
{
uint16_t insns[5];
int ld_adr, ld_dst, ld_mop;
int op_dst, op_src, op_opc;
int mv_src, mt_dst, st_src, st_mop;
TCGv op_arg;
uint32_t pc = ctx->base.pc_next;
uint32_t pc_end = ctx->base.tb->cs_base;
int backup = sextract32(ctx->tbflags, GUSA_SHIFT, 8);
int max_insns = (pc_end - pc) / 2;
int i;
if (pc != pc_end + backup || max_insns < 2) {
/* This is a malformed gUSA region. Don't do anything special,
since the interpreter is likely to get confused. */
ctx->envflags &= ~GUSA_MASK;
return 0;
}
if (ctx->tbflags & GUSA_EXCLUSIVE) {
/* Regardless of single-stepping or the end of the page,
we must complete execution of the gUSA region while
holding the exclusive lock. */
*pmax_insns = max_insns;
return 0;
}
/* The state machine below will consume only a few insns.
If there are more than that in a region, fail now. */
if (max_insns > ARRAY_SIZE(insns)) {
@ -2140,7 +2123,6 @@ static int decode_gusa(DisasContext *ctx, CPUSH4State *env, int *pmax_insns)
/*
* Emit the operation.
*/
tcg_gen_insn_start(pc, ctx->envflags);
switch (op_opc) {
case -1:
/* No operation found. Look for exchange pattern. */
@ -2235,7 +2217,8 @@ static int decode_gusa(DisasContext *ctx, CPUSH4State *env, int *pmax_insns)
/* The entire region has been translated. */
ctx->envflags &= ~GUSA_MASK;
ctx->base.pc_next = pc_end;
return max_insns;
ctx->base.num_insns += max_insns - 1;
return;
fail:
qemu_log_mask(LOG_UNIMP, "Unrecognized gUSA sequence %08x-%08x\n",
@ -2243,7 +2226,6 @@ static int decode_gusa(DisasContext *ctx, CPUSH4State *env, int *pmax_insns)
/* Restart with the EXCLUSIVE bit set, within a TB run via
cpu_exec_step_atomic holding the exclusive lock. */
tcg_gen_insn_start(pc, ctx->envflags);
ctx->envflags |= GUSA_EXCLUSIVE;
gen_save_cpu_state(ctx, false);
gen_helper_exclusive(cpu_env);
@ -2254,7 +2236,7 @@ static int decode_gusa(DisasContext *ctx, CPUSH4State *env, int *pmax_insns)
entire region consumed via ctx->base.pc_next so that it's immediately
available in the disassembly dump. */
ctx->base.pc_next = pc_end;
return 1;
ctx->base.num_insns += max_insns - 1;
}
#endif
@ -2262,19 +2244,39 @@ static void sh4_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
CPUSH4State *env = cs->env_ptr;
uint32_t tbflags;
int bound;
ctx->tbflags = (uint32_t)ctx->base.tb->flags;
ctx->envflags = ctx->base.tb->flags & TB_FLAG_ENVFLAGS_MASK;
ctx->memidx = (ctx->tbflags & (1u << SR_MD)) == 0 ? 1 : 0;
ctx->tbflags = tbflags = ctx->base.tb->flags;
ctx->envflags = tbflags & TB_FLAG_ENVFLAGS_MASK;
ctx->memidx = (tbflags & (1u << SR_MD)) == 0 ? 1 : 0;
/* We don't know if the delayed pc came from a dynamic or static branch,
so assume it is a dynamic branch. */
ctx->delayed_pc = -1; /* use delayed pc from env pointer */
ctx->features = env->features;
ctx->has_movcal = (ctx->tbflags & TB_FLAG_PENDING_MOVCA);
ctx->gbank = ((ctx->tbflags & (1 << SR_MD)) &&
(ctx->tbflags & (1 << SR_RB))) * 0x10;
ctx->fbank = ctx->tbflags & FPSCR_FR ? 0x10 : 0;
ctx->has_movcal = (tbflags & TB_FLAG_PENDING_MOVCA);
ctx->gbank = ((tbflags & (1 << SR_MD)) &&
(tbflags & (1 << SR_RB))) * 0x10;
ctx->fbank = tbflags & FPSCR_FR ? 0x10 : 0;
if (tbflags & GUSA_MASK) {
uint32_t pc = ctx->base.pc_next;
uint32_t pc_end = ctx->base.tb->cs_base;
int backup = sextract32(ctx->tbflags, GUSA_SHIFT, 8);
int max_insns = (pc_end - pc) / 2;
if (pc != pc_end + backup || max_insns < 2) {
/* This is a malformed gUSA region. Don't do anything special,
since the interpreter is likely to get confused. */
ctx->envflags &= ~GUSA_MASK;
} else if (tbflags & GUSA_EXCLUSIVE) {
/* Regardless of single-stepping or the end of the page,
we must complete execution of the gUSA region while
holding the exclusive lock. */
ctx->base.max_insns = max_insns;
return;
}
}
/* Since the ISA is fixed-width, we can bound by the number
of instructions remaining on the page. */
@ -2284,14 +2286,6 @@ static void sh4_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
static void sh4_tr_tb_start(DisasContextBase *dcbase, CPUState *cs)
{
#ifdef CONFIG_USER_ONLY
DisasContext *ctx = container_of(dcbase, DisasContext, base);
CPUSH4State *env = cs->env_ptr;
if (ctx->tbflags & GUSA_MASK) {
ctx->base.num_insns = decode_gusa(ctx, env, &ctx->base.max_insns);
}
#endif
}
static void sh4_tr_insn_start(DisasContextBase *dcbase, CPUState *cs)
@ -2323,6 +2317,19 @@ static void sh4_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
CPUSH4State *env = cs->env_ptr;
DisasContext *ctx = container_of(dcbase, DisasContext, base);
#ifdef CONFIG_USER_ONLY
if (unlikely(ctx->envflags & GUSA_MASK)
&& !(ctx->envflags & GUSA_EXCLUSIVE)) {
/* We're in an gUSA region, and we have not already fallen
back on using an exclusive region. Attempt to parse the
region into a single supported atomic operation. Failure
is handled within the parser by raising an exception to
retry using an exclusive region. */
decode_gusa(ctx, env);
return;
}
#endif
ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next);
decode_opc(ctx);
ctx->base.pc_next += 2;