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[Qemu-devel] [RFC PATCH V1 2/2] target-microblaze: lwx/swx: first implem
From: |
Peter A. G. Crosthwaite |
Subject: |
[Qemu-devel] [RFC PATCH V1 2/2] target-microblaze: lwx/swx: first implementation |
Date: |
Thu, 17 May 2012 15:37:50 +1000 |
Signed-off-by: Peter A. G. Crosthwaite <address@hidden>
---
target-microblaze/cpu.h | 1 +
target-microblaze/helper.c | 2 +
target-microblaze/translate.c | 51 ++++++++++++++++++++++++++++++++++++++--
3 files changed, 51 insertions(+), 3 deletions(-)
diff --git a/target-microblaze/cpu.h b/target-microblaze/cpu.h
index 718d5bb..775a16d 100644
--- a/target-microblaze/cpu.h
+++ b/target-microblaze/cpu.h
@@ -250,6 +250,7 @@ struct CPUMBState {
#define DRTE_FLAG (1 << 17)
#define DRTB_FLAG (1 << 18)
#define D_FLAG (1 << 19) /* Bit in ESR. */
+#define R_FLAG (1 << 24) /* Reservation Bit */
/* TB dependent CPUMBState. */
#define IFLAGS_TB_MASK (D_FLAG | IMM_FLAG | DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)
uint32_t iflags;
diff --git a/target-microblaze/helper.c b/target-microblaze/helper.c
index 2412a58..235f1be 100644
--- a/target-microblaze/helper.c
+++ b/target-microblaze/helper.c
@@ -29,6 +29,7 @@
void do_interrupt (CPUMBState *env)
{
env->exception_index = -1;
+ env->iflags &= ~R_FLAG;
env->regs[14] = env->sregs[SR_PC];
}
@@ -116,6 +117,7 @@ void do_interrupt(CPUMBState *env)
assert(!((env->iflags & D_FLAG) && (env->iflags & IMM_FLAG)));
assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
/* assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions. */
+ env->iflags &= ~R_FLAG;
switch (env->exception_index) {
case EXCP_HW_EXCP:
if (!(env->pvr.regs[0] & PVR0_USE_EXC_MASK)) {
diff --git a/target-microblaze/translate.c b/target-microblaze/translate.c
index a362938..9c1a0b5 100644
--- a/target-microblaze/translate.c
+++ b/target-microblaze/translate.c
@@ -948,12 +948,13 @@ static inline void dec_byteswap(DisasContext *dc, TCGv
dst, TCGv src, int size)
static void dec_load(DisasContext *dc)
{
TCGv t, *addr;
- unsigned int size, rev = 0;
+ unsigned int size, rev = 0, ex = 0;
size = 1 << (dc->opcode & 3);
if (!dc->type_b) {
rev = (dc->ir >> 9) & 1;
+ ex = (dc->ir >> 10) & 1;
}
if (size > 4 && (dc->tb_flags & MSR_EE_FLAG)
@@ -1019,6 +1020,17 @@ static void dec_load(DisasContext *dc)
}
}
+ /* lwx does not throw unaligned access errors, so force alignment */
+ if (ex) {
+ /* Force addr into the temp. */
+ if (addr != &t) {
+ t = tcg_temp_new();
+ tcg_gen_mov_tl(t, *addr);
+ addr = &t;
+ }
+ tcg_gen_andi_tl(t, t, ~3);
+ }
+
/* If we get a fault on a dslot, the jmpstate better be in sync. */
sync_jmpstate(dc);
@@ -1057,6 +1069,13 @@ static void dec_load(DisasContext *dc)
}
}
+ if (ex) { /* lwx */
+ /* no support for for AXI exlusive so always clear C */
+ TCGv_i32 zero = tcg_const_i32(0);
+ write_carry(dc, zero);
+ dc->tb_flags |= R_FLAG;
+ }
+
if (addr == &t)
tcg_temp_free(t);
}
@@ -1078,12 +1097,14 @@ static void gen_store(DisasContext *dc, TCGv addr, TCGv
val,
static void dec_store(DisasContext *dc)
{
- TCGv t, *addr;
- unsigned int size, rev = 0;
+ TCGv t, *addr, swx_carry = 0;
+ int swx_skip;
+ unsigned int size, rev = 0, ex = 0;
size = 1 << (dc->opcode & 3);
if (!dc->type_b) {
rev = (dc->ir >> 9) & 1;
+ ex = (dc->ir >> 10) & 1;
}
if (size > 4 && (dc->tb_flags & MSR_EE_FLAG)
@@ -1099,6 +1120,26 @@ static void dec_store(DisasContext *dc)
sync_jmpstate(dc);
addr = compute_ldst_addr(dc, &t);
+ if (ex) { /* swx */
+ TCGv r_check = tcg_temp_new();
+ swx_carry = tcg_temp_new();
+ swx_skip = gen_new_label();
+
+ tcg_gen_andi_tl(r_check, env_iflags, R_FLAG);
+ tcg_gen_movi_tl(swx_carry, 1);
+ tcg_gen_brcondi_tl(TCG_COND_NE, r_check, R_FLAG, swx_skip);
+ tcg_gen_movi_tl(swx_carry, 0);
+
+ /* Force addr into the temp. */
+ if (addr != &t) {
+ t = tcg_temp_new();
+ tcg_gen_mov_tl(t, *addr);
+ addr = &t;
+ }
+ /* swx does not throw unaligned access errors, so force alignment */
+ tcg_gen_andi_tl(t, t, ~3);
+ }
+
if (rev && size != 4) {
/* Endian reverse the address. t is addr. */
switch (size) {
@@ -1174,6 +1215,10 @@ static void dec_store(DisasContext *dc)
gen_helper_memalign(*addr, tcg_const_tl(dc->rd),
tcg_const_tl(1), tcg_const_tl(size - 1));
}
+ if (ex) {
+ gen_set_label(swx_skip);
+ write_carry(dc, swx_carry);
+ }
if (addr == &t)
tcg_temp_free(t);
--
1.7.3.2