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target/s390x: Fix EXECUTE of relative branches 

Fix a problem similar to the one fixed by commit 703d03a4aa
("target/s390x: Fix EXECUTE of relative long instructions"), but now
for relative branches.

Reported-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230426235813.198183-2-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Ilya Leoshkevich 2023-04-27 01:58:12 +02:00 committed by Thomas Huth
parent c2485ea402
commit e8ecdfeb30
1 changed files with 58 additions and 23 deletions
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81
target/s390x/tcg/translate.c
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@ -1534,18 +1534,51 @@ static DisasJumpType op_bal(DisasContext *s, DisasOps *o)
}
}
/*
* Disassemble the target of a branch. The results are returned in a form
* suitable for passing into help_branch():
*
* - bool IS_IMM reflects whether the target is fixed or computed. Non-EXECUTEd
* branches, whose DisasContext *S contains the relative immediate field RI,
* are considered fixed. All the other branches are considered computed.
* - int IMM is the value of RI.
* - TCGv_i64 CDEST is the address of the computed target.
*/
#define disas_jdest(s, ri, is_imm, imm, cdest) do { \
if (have_field(s, ri)) { \
if (unlikely(s->ex_value)) { \
cdest = tcg_temp_new_i64(); \
tcg_gen_ld_i64(cdest, cpu_env, offsetof(CPUS390XState, ex_target));\
tcg_gen_addi_i64(cdest, cdest, (int64_t)get_field(s, ri) * 2); \
is_imm = false; \
} else { \
is_imm = true; \
} \
} else { \
is_imm = false; \
} \
imm = is_imm ? get_field(s, ri) : 0; \
} while (false)
static DisasJumpType op_basi(DisasContext *s, DisasOps *o)
{
DisasCompare c;
bool is_imm;
int imm;
pc_to_link_info(o->out, s, s->pc_tmp);
return help_goto_direct(s, s->base.pc_next + (int64_t)get_field(s, i2) * 2);
disas_jdest(s, i2, is_imm, imm, o->in2);
disas_jcc(s, &c, 0xf);
return help_branch(s, &c, is_imm, imm, o->in2);
}
static DisasJumpType op_bc(DisasContext *s, DisasOps *o)
{
int m1 = get_field(s, m1);
bool is_imm = have_field(s, i2);
int imm = is_imm ? get_field(s, i2) : 0;
DisasCompare c;
bool is_imm;
int imm;
/* BCR with R2 = 0 causes no branching */
if (have_field(s, r2) && get_field(s, r2) == 0) {
@ -1562,6 +1595,7 @@ static DisasJumpType op_bc(DisasContext *s, DisasOps *o)
return DISAS_NEXT;
}
disas_jdest(s, i2, is_imm, imm, o->in2);
disas_jcc(s, &c, m1);
return help_branch(s, &c, is_imm, imm, o->in2);
}
@ -1569,10 +1603,10 @@ static DisasJumpType op_bc(DisasContext *s, DisasOps *o)
static DisasJumpType op_bct32(DisasContext *s, DisasOps *o)
{
int r1 = get_field(s, r1);
bool is_imm = have_field(s, i2);
int imm = is_imm ? get_field(s, i2) : 0;
DisasCompare c;
bool is_imm;
TCGv_i64 t;
int imm;
c.cond = TCG_COND_NE;
c.is_64 = false;
@ -1584,6 +1618,7 @@ static DisasJumpType op_bct32(DisasContext *s, DisasOps *o)
c.u.s32.b = tcg_constant_i32(0);
tcg_gen_extrl_i64_i32(c.u.s32.a, t);
disas_jdest(s, i2, is_imm, imm, o->in2);
return help_branch(s, &c, is_imm, imm, o->in2);
}
@ -1611,9 +1646,9 @@ static DisasJumpType op_bcth(DisasContext *s, DisasOps *o)
static DisasJumpType op_bct64(DisasContext *s, DisasOps *o)
{
int r1 = get_field(s, r1);
bool is_imm = have_field(s, i2);
int imm = is_imm ? get_field(s, i2) : 0;
DisasCompare c;
bool is_imm;
int imm;
c.cond = TCG_COND_NE;
c.is_64 = true;
@ -1622,6 +1657,7 @@ static DisasJumpType op_bct64(DisasContext *s, DisasOps *o)
c.u.s64.a = regs[r1];
c.u.s64.b = tcg_constant_i64(0);
disas_jdest(s, i2, is_imm, imm, o->in2);
return help_branch(s, &c, is_imm, imm, o->in2);
}
@ -1629,10 +1665,10 @@ static DisasJumpType op_bx32(DisasContext *s, DisasOps *o)
{
int r1 = get_field(s, r1);
int r3 = get_field(s, r3);
bool is_imm = have_field(s, i2);
int imm = is_imm ? get_field(s, i2) : 0;
DisasCompare c;
bool is_imm;
TCGv_i64 t;
int imm;
c.cond = (s->insn->data ? TCG_COND_LE : TCG_COND_GT);
c.is_64 = false;
@ -1645,6 +1681,7 @@ static DisasJumpType op_bx32(DisasContext *s, DisasOps *o)
tcg_gen_extrl_i64_i32(c.u.s32.b, regs[r3 | 1]);
store_reg32_i64(r1, t);
disas_jdest(s, i2, is_imm, imm, o->in2);
return help_branch(s, &c, is_imm, imm, o->in2);
}
@ -1652,9 +1689,9 @@ static DisasJumpType op_bx64(DisasContext *s, DisasOps *o)
{
int r1 = get_field(s, r1);
int r3 = get_field(s, r3);
bool is_imm = have_field(s, i2);
int imm = is_imm ? get_field(s, i2) : 0;
DisasCompare c;
bool is_imm;
int imm;
c.cond = (s->insn->data ? TCG_COND_LE : TCG_COND_GT);
c.is_64 = true;
@ -1668,6 +1705,7 @@ static DisasJumpType op_bx64(DisasContext *s, DisasOps *o)
tcg_gen_add_i64(regs[r1], regs[r1], regs[r3]);
c.u.s64.a = regs[r1];
disas_jdest(s, i2, is_imm, imm, o->in2);
return help_branch(s, &c, is_imm, imm, o->in2);
}
@ -1685,10 +1723,9 @@ static DisasJumpType op_cj(DisasContext *s, DisasOps *o)
c.u.s64.a = o->in1;
c.u.s64.b = o->in2;
is_imm = have_field(s, i4);
if (is_imm) {
imm = get_field(s, i4);
} else {
o->out = NULL;
disas_jdest(s, i4, is_imm, imm, o->out);
if (!is_imm && !o->out) {
imm = 0;
o->out = get_address(s, 0, get_field(s, b4),
get_field(s, d4));
@ -5764,15 +5801,13 @@ static void in2_a2(DisasContext *s, DisasOps *o)
static TCGv gen_ri2(DisasContext *s)
{
int64_t delta = (int64_t)get_field(s, i2) * 2;
TCGv ri2;
TCGv ri2 = NULL;
bool is_imm;
int imm;
if (unlikely(s->ex_value)) {
ri2 = tcg_temp_new_i64();
tcg_gen_ld_i64(ri2, cpu_env, offsetof(CPUS390XState, ex_target));
tcg_gen_addi_i64(ri2, ri2, delta);
} else {
ri2 = tcg_constant_i64(s->base.pc_next + delta);
disas_jdest(s, i2, is_imm, imm, ri2);
if (is_imm) {
ri2 = tcg_constant_i64(s->base.pc_next + imm * 2);
}
return ri2;