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[Qemu-devel] [PATCH v2 17/29] target/s390x: fix COMPARE LOGICAL LONG EXT
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH v2 17/29] target/s390x: fix COMPARE LOGICAL LONG EXTENDED |
Date: |
Mon, 29 May 2017 21:24:28 +0200 |
There are multiple issues with the COMPARE LOGICAL LONG EXTENDED
instruction:
- The test between the two operands is inverted, leading to an inversion
of the cc values 1 and 2.
- The address and length of an operand continue to be decreased after
reaching the end of this operand. These values are then wrong write
back to the registers.
- We should limit the amount of bytes to process, so that interrupts can
be served correctly.
At the same time rename dest into src1 and src into src3 to match the
operand names and make the code less confusing.
Signed-off-by: Aurelien Jarno <address@hidden>
---
target/s390x/mem_helper.c | 54 ++++++++++++++++++++++++++++++++---------------
target/s390x/translate.c | 20 +++++++++++++-----
2 files changed, 52 insertions(+), 22 deletions(-)
diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c
index 911c3d7f8e..b3a2ce2252 100644
--- a/target/s390x/mem_helper.c
+++ b/target/s390x/mem_helper.c
@@ -666,35 +666,55 @@ uint32_t HELPER(clcle)(CPUS390XState *env, uint32_t r1,
uint64_t a2,
uint32_t r3)
{
uintptr_t ra = GETPC();
- uint64_t destlen = get_length(env, r1 + 1);
- uint64_t dest = get_address(env, r1);
- uint64_t srclen = get_length(env, r3 + 1);
- uint64_t src = get_address(env, r3);
+ uint64_t src1len = get_length(env, r1 + 1);
+ uint64_t src1 = get_address(env, r1);
+ uint64_t src3len = get_length(env, r3 + 1);
+ uint64_t src3 = get_address(env, r3);
uint8_t pad = a2 & 0xff;
+ uint64_t len = MAX(src1len, src3len);
uint32_t cc = 0;
- if (!(destlen || srclen)) {
+ if (!len) {
return cc;
}
- if (srclen > destlen) {
- srclen = destlen;
+ /* Lest we fail to service interrupts in a timely manner, limit the
+ amount of work we're willing to do. For now, let's cap at 8k. */
+ if (len > 0x2000) {
+ len = 0x2000;
+ cc = 3;
}
- for (; destlen || srclen; src++, dest++, destlen--, srclen--) {
- uint8_t v1 = srclen ? cpu_ldub_data_ra(env, src, ra) : pad;
- uint8_t v2 = destlen ? cpu_ldub_data_ra(env, dest, ra) : pad;
- if (v1 != v2) {
- cc = (v1 < v2) ? 1 : 2;
+ for (; len; len--) {
+ uint8_t v1 = pad;
+ uint8_t v3 = pad;
+
+ if (src1len) {
+ v1 = cpu_ldub_data_ra(env, src1, ra);
+ }
+ if (src3len) {
+ v3 = cpu_ldub_data_ra(env, src3, ra);
+ }
+
+ if (v1 != v3) {
+ cc = (v1 < v3) ? 1 : 2;
break;
}
+
+ if (src1len) {
+ src1++;
+ src1len--;
+ }
+ if (src3len) {
+ src3++;
+ src3len--;
+ }
}
- set_length(env, r1 + 1, destlen);
- /* can't use srclen here, we trunc'ed it */
- set_length(env, r3 + 1, env->regs[r3 + 1] - src - env->regs[r3]);
- set_address(env, r1, dest);
- set_address(env, r3, src);
+ set_length(env, r1 + 1, src1len);
+ set_length(env, r3 + 1, src3len);
+ set_address(env, r1, src1);
+ set_address(env, r3, src3);
return cc;
}
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index 95ca53c1ef..9309e58009 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -1917,11 +1917,21 @@ static ExitStatus op_clc(DisasContext *s, DisasOps *o)
static ExitStatus op_clcle(DisasContext *s, DisasOps *o)
{
- TCGv_i32 r1 = tcg_const_i32(get_field(s->fields, r1));
- TCGv_i32 r3 = tcg_const_i32(get_field(s->fields, r3));
- gen_helper_clcle(cc_op, cpu_env, r1, o->in2, r3);
- tcg_temp_free_i32(r1);
- tcg_temp_free_i32(r3);
+ int r1 = get_field(s->fields, r1);
+ int r3 = get_field(s->fields, r3);
+ TCGv_i32 t1, t3;
+
+ /* r1 and r3 must be even. */
+ if (r1 & 1 || r3 & 1) {
+ gen_program_exception(s, PGM_SPECIFICATION);
+ return EXIT_NORETURN;
+ }
+
+ t1 = tcg_const_i32(r1);
+ t3 = tcg_const_i32(r3);
+ gen_helper_clcle(cc_op, cpu_env, t1, o->in2, t3);
+ tcg_temp_free_i32(t1);
+ tcg_temp_free_i32(t3);
set_cc_static(s);
return NO_EXIT;
}
--
2.11.0
- Re: [Qemu-devel] [PATCH v2 19/29] target/s390x: fix adj_len_to_page, (continued)
- [Qemu-devel] [PATCH v2 14/29] target/s390x: improve 24-bit and 31-bit addresses read, Aurelien Jarno, 2017/05/29
- [Qemu-devel] [PATCH v2 05/29] target/s390x: implement TEST ADDRESSING MODE, Aurelien Jarno, 2017/05/29
- [Qemu-devel] [PATCH v2 01/29] target/s390x: remove dead code in translate.c, Aurelien Jarno, 2017/05/29
- [Qemu-devel] [PATCH v2 07/29] target/s390x: implement LOAD PAIR FROM QUADWORD, Aurelien Jarno, 2017/05/29
- [Qemu-devel] [PATCH v2 17/29] target/s390x: fix COMPARE LOGICAL LONG EXTENDED,
Aurelien Jarno <=
- [Qemu-devel] [PATCH v2 16/29] target/s390x: improve 24-bit and 31-bit lengths read/write, Aurelien Jarno, 2017/05/29
- [Qemu-devel] [PATCH v2 03/29] target/s390x: implement local-TLB-clearing in IPTE, Aurelien Jarno, 2017/05/29
- Re: [Qemu-devel] [PATCH v2 03/29] target/s390x: implement local-TLB-clearing in IPTE, Richard Henderson, 2017/05/30
- [Qemu-devel] [PATCH v2 10/29] target/s390x: implement MOVE INVERSE, Aurelien Jarno, 2017/05/29
- [Qemu-devel] [PATCH v2 20/29] target/s390x: improve MOVE LONG and MOVE LONG EXTENDED, Aurelien Jarno, 2017/05/29