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[Qemu-devel] [PATCH v3 20/32] target-xtensa: implement loop option
From: |
Max Filippov |
Subject: |
[Qemu-devel] [PATCH v3 20/32] target-xtensa: implement loop option |
Date: |
Thu, 1 Sep 2011 01:57:11 +0400 |
See ISA, 4.3.2 for details.
Operations that change LEND SR value invalidate TBs at the old and at
the new LEND. LEND value at TB compilation time is considered constant
and loop instruction is generated based on this value.
Invalidation may be avoided for the TB at the old LEND address, since
looping code verifies actual LEND value.
Invalidation may be avoided for the TB at the new LEND address if
there's a way to associate LEND address with TB at compilation time and
later verify that it doesn't change.
Signed-off-by: Max Filippov <address@hidden>
---
target-xtensa/cpu.h | 3 ++
target-xtensa/helpers.h | 2 +
target-xtensa/op_helper.c | 20 ++++++++++++
target-xtensa/translate.c | 77 +++++++++++++++++++++++++++++++++++++++-----
4 files changed, 93 insertions(+), 9 deletions(-)
diff --git a/target-xtensa/cpu.h b/target-xtensa/cpu.h
index 7e662f5..97badf2 100644
--- a/target-xtensa/cpu.h
+++ b/target-xtensa/cpu.h
@@ -106,6 +106,9 @@ enum {
};
enum {
+ LBEG = 0,
+ LEND = 1,
+ LCOUNT = 2,
SAR = 3,
SCOMPARE1 = 12,
WINDOW_BASE = 72,
diff --git a/target-xtensa/helpers.h b/target-xtensa/helpers.h
index 0971fde..b318c5a 100644
--- a/target-xtensa/helpers.h
+++ b/target-xtensa/helpers.h
@@ -12,6 +12,8 @@ DEF_HELPER_1(rotw, void, i32)
DEF_HELPER_2(window_check, void, i32, i32)
DEF_HELPER_0(restore_owb, void)
DEF_HELPER_1(movsp, void, i32)
+DEF_HELPER_1(wsr_lbeg, void, i32)
+DEF_HELPER_1(wsr_lend, void, i32)
DEF_HELPER_0(dump_state, void)
#include "def-helper.h"
diff --git a/target-xtensa/op_helper.c b/target-xtensa/op_helper.c
index 7f75422..26d2d2e 100644
--- a/target-xtensa/op_helper.c
+++ b/target-xtensa/op_helper.c
@@ -281,6 +281,26 @@ void HELPER(movsp)(uint32_t pc)
}
}
+void HELPER(wsr_lbeg)(uint32_t v)
+{
+ if (env->sregs[LBEG] != v) {
+ tb_invalidate_phys_page_range(
+ env->sregs[LEND] - 1, env->sregs[LEND], 0);
+ env->sregs[LBEG] = v;
+ }
+}
+
+void HELPER(wsr_lend)(uint32_t v)
+{
+ if (env->sregs[LEND] != v) {
+ tb_invalidate_phys_page_range(
+ env->sregs[LEND] - 1, env->sregs[LEND], 0);
+ env->sregs[LEND] = v;
+ tb_invalidate_phys_page_range(
+ env->sregs[LEND] - 1, env->sregs[LEND], 0);
+ }
+}
+
void HELPER(dump_state)(void)
{
cpu_dump_state(env, stderr, fprintf, 0);
diff --git a/target-xtensa/translate.c b/target-xtensa/translate.c
index b5de173..448a48d 100644
--- a/target-xtensa/translate.c
+++ b/target-xtensa/translate.c
@@ -47,6 +47,8 @@ typedef struct DisasContext {
uint32_t next_pc;
int cring;
int ring;
+ uint32_t lbeg;
+ uint32_t lend;
int is_jmp;
int singlestep_enabled;
@@ -65,6 +67,9 @@ static TCGv_i32 cpu_UR[256];
#include "gen-icount.h"
static const char * const sregnames[256] = {
+ [LBEG] = "LBEG",
+ [LEND] = "LEND",
+ [LCOUNT] = "LCOUNT",
[SAR] = "SAR",
[SCOMPARE1] = "SCOMPARE1",
[WINDOW_BASE] = "WINDOW_BASE",
@@ -247,13 +252,37 @@ static void gen_callwi(DisasContext *dc, int callinc,
uint32_t dest, int slot)
tcg_temp_free(tmp);
}
+static bool gen_check_loop_end(DisasContext *dc, int slot)
+{
+ if (option_enabled(dc, XTENSA_OPTION_LOOP) &&
+ !(dc->tb->flags & XTENSA_TBFLAG_EXCM) &&
+ dc->next_pc == dc->lend) {
+ int label = gen_new_label();
+
+ tcg_gen_brcondi_i32(TCG_COND_EQ, cpu_SR[LCOUNT], 0, label);
+ tcg_gen_subi_i32(cpu_SR[LCOUNT], cpu_SR[LCOUNT], 1);
+ gen_jumpi(dc, dc->lbeg, slot);
+ gen_set_label(label);
+ gen_jumpi(dc, dc->next_pc, -1);
+ return true;
+ }
+ return false;
+}
+
+static void gen_jumpi_check_loop_end(DisasContext *dc, int slot)
+{
+ if (!gen_check_loop_end(dc, slot)) {
+ gen_jumpi(dc, dc->next_pc, slot);
+ }
+}
+
static void gen_brcond(DisasContext *dc, TCGCond cond,
TCGv_i32 t0, TCGv_i32 t1, uint32_t offset)
{
int label = gen_new_label();
tcg_gen_brcond_i32(cond, t0, t1, label);
- gen_jumpi(dc, dc->next_pc, 0);
+ gen_jumpi_check_loop_end(dc, 0);
gen_set_label(label);
gen_jumpi(dc, dc->pc + offset, 1);
}
@@ -283,6 +312,16 @@ static void gen_rsr(DisasContext *dc, TCGv_i32 d, uint32_t
sr)
}
}
+static void gen_wsr_lbeg(DisasContext *dc, uint32_t sr, TCGv_i32 s)
+{
+ gen_helper_wsr_lbeg(s);
+}
+
+static void gen_wsr_lend(DisasContext *dc, uint32_t sr, TCGv_i32 s)
+{
+ gen_helper_wsr_lend(s);
+}
+
static void gen_wsr_sar(DisasContext *dc, uint32_t sr, TCGv_i32 s)
{
tcg_gen_andi_i32(cpu_SR[sr], s, 0x3f);
@@ -308,13 +347,15 @@ static void gen_wsr_ps(DisasContext *dc, uint32_t sr,
TCGv_i32 v)
}
tcg_gen_andi_i32(cpu_SR[sr], v, mask);
/* This can change mmu index, so exit tb */
- gen_jumpi(dc, dc->next_pc, -1);
+ gen_jumpi_check_loop_end(dc, -1);
}
static void gen_wsr(DisasContext *dc, uint32_t sr, TCGv_i32 s)
{
static void (* const wsr_handler[256])(DisasContext *dc,
uint32_t sr, TCGv_i32 v) = {
+ [LBEG] = gen_wsr_lbeg,
+ [LEND] = gen_wsr_lend,
[SAR] = gen_wsr_sar,
[WINDOW_BASE] = gen_wsr_windowbase,
[PS] = gen_wsr_ps,
@@ -1542,15 +1583,29 @@ static void disas_xtensa_insn(DisasContext *dc)
break;
case 8: /*LOOP*/
- TBD();
- break;
-
case 9: /*LOOPNEZ*/
- TBD();
- break;
-
case 10: /*LOOPGTZ*/
- TBD();
+ HAS_OPTION(XTENSA_OPTION_LOOP);
+ {
+ uint32_t lend = dc->pc + RRI8_IMM8 + 4;
+ TCGv_i32 tmp = tcg_const_i32(lend);
+
+ tcg_gen_subi_i32(cpu_SR[LCOUNT], cpu_R[RRI8_S], 1);
+ tcg_gen_movi_i32(cpu_SR[LBEG], dc->next_pc);
+ gen_wsr_lend(dc, LEND, tmp);
+ tcg_temp_free(tmp);
+
+ if (BRI8_R > 8) {
+ int label = gen_new_label();
+ tcg_gen_brcondi_i32(
+ BRI8_R == 9 ? TCG_COND_NE : TCG_COND_GT,
+ cpu_R[RRI8_S], 0, label);
+ gen_jumpi(dc, lend, 1);
+ gen_set_label(label);
+ }
+
+ gen_jumpi(dc, dc->next_pc, 0);
+ }
break;
default: /*reserved*/
@@ -1727,7 +1782,9 @@ static void disas_xtensa_insn(DisasContext *dc)
break;
}
+ gen_check_loop_end(dc, 0);
dc->pc = dc->next_pc;
+
return;
invalid_opcode:
@@ -1773,6 +1830,8 @@ static void gen_intermediate_code_internal(
dc.pc = pc_start;
dc.ring = tb->flags & XTENSA_TBFLAG_RING_MASK;
dc.cring = (tb->flags & XTENSA_TBFLAG_EXCM) ? 0 : dc.ring;
+ dc.lbeg = env->sregs[LBEG];
+ dc.lend = env->sregs[LEND];
dc.is_jmp = DISAS_NEXT;
init_sar_tracker(&dc);
--
1.7.6
- [Qemu-devel] [PATCH v3 09/32] target-xtensa: add special and user registers, (continued)
- [Qemu-devel] [PATCH v3 09/32] target-xtensa: add special and user registers, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 16/32] target-xtensa: add PS register and access control, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 06/32] target-xtensa: add sample board, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 18/32] target-xtensa: implement RST2 group (32 bit mul/div/rem), Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 21/32] target-xtensa: implement extended L32R, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 12/32] target-xtensa: implement LSAI group, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 07/32] target-xtensa: implement conditional jumps, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 10/32] target-xtensa: implement RST3 group, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 22/32] target-xtensa: implement unaligned exception option, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 27/32] target-xtensa: implement relocatable vectors, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 20/32] target-xtensa: implement loop option,
Max Filippov <=
- [Qemu-devel] [PATCH v3 13/32] target-xtensa: mark reserved and TBD opcodes, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 11/32] target-xtensa: implement shifts (ST1 and RST1 groups), Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 23/32] target-xtensa: implement SIMCALL, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 17/32] target-xtensa: implement exceptions, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 19/32] target-xtensa: implement windowed registers, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 03/32] target-xtensa: implement disas_xtensa_insn, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 30/32] target-xtensa: add dc232b core and board, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 25/32] target-xtensa: implement accurate window check, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 32/32] target-xtensa: add regression testsuite, Max Filippov, 2011/08/31
- [Qemu-devel] [PATCH v3 24/32] target-xtensa: implement interrupt option, Max Filippov, 2011/08/31