* [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
@ 2014-02-13 9:52 Sebastian Huber
2014-02-13 12:01 ` Fabien Chouteau
0 siblings, 1 reply; 11+ messages in thread
From: Sebastian Huber @ 2014-02-13 9:52 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, Sebastian Huber, Fabien Chouteau
The LEON3 processor has support for the CASA instruction which is
normally only available for SPARC V9 processors. Binutils 2.24
and GCC 4.9 will support this instruction for LEON3. GCC uses it to
generate C11 atomic operations.
The CAS synthetic instruction uses an ASI of 0x80. If TARGET_SPARC64 is
not defined use a supervisor data load/store for an ASI of 0x80 in
helper_ld_asi()/helper_st_asi().
Tested with the following program:
#include <assert.h>
#include <stdatomic.h>
void test(void)
{
atomic_int a;
int e;
_Bool b;
atomic_store(&a, 1);
e = 1;
b = atomic_compare_exchange_strong(&a, &e, 2);
assert(b);
assert(atomic_load(&a) == 2);
atomic_store(&a, 3);
e = 4;
b = atomic_compare_exchange_strong(&a, &e, 5);
assert(!b);
assert(atomic_load(&a) == 3);
}
Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
Reviewed-by: Fabien Chouteau <chouteau@adacore.com>
---
target-sparc/cpu.c | 3 +-
target-sparc/cpu.h | 4 ++-
target-sparc/helper.h | 4 ++-
target-sparc/ldst_helper.c | 28 +++++++++++++++-----------
target-sparc/translate.c | 47 ++++++++++++++++++++++++++++---------------
5 files changed, 54 insertions(+), 32 deletions(-)
diff --git a/target-sparc/cpu.c b/target-sparc/cpu.c
index e7f878e..5806e59 100644
--- a/target-sparc/cpu.c
+++ b/target-sparc/cpu.c
@@ -458,7 +458,8 @@ static const sparc_def_t sparc_defs[] = {
.mmu_trcr_mask = 0xffffffff,
.nwindows = 8,
.features = CPU_DEFAULT_FEATURES | CPU_FEATURE_TA0_SHUTDOWN |
- CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL | CPU_FEATURE_POWERDOWN,
+ CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL | CPU_FEATURE_POWERDOWN |
+ CPU_FEATURE_CASA,
},
#endif
};
diff --git a/target-sparc/cpu.h b/target-sparc/cpu.h
index c519063..2531cf9 100644
--- a/target-sparc/cpu.h
+++ b/target-sparc/cpu.h
@@ -271,12 +271,14 @@ typedef struct sparc_def_t {
#define CPU_FEATURE_ASR17 (1 << 15)
#define CPU_FEATURE_CACHE_CTRL (1 << 16)
#define CPU_FEATURE_POWERDOWN (1 << 17)
+#define CPU_FEATURE_CASA (1 << 18)
#ifndef TARGET_SPARC64
#define CPU_DEFAULT_FEATURES (CPU_FEATURE_FLOAT | CPU_FEATURE_SWAP | \
CPU_FEATURE_MUL | CPU_FEATURE_DIV | \
CPU_FEATURE_FLUSH | CPU_FEATURE_FSQRT | \
- CPU_FEATURE_FMUL | CPU_FEATURE_FSMULD)
+ CPU_FEATURE_FMUL | CPU_FEATURE_FSMULD | \
+ CPU_FEATURE_CASA)
#else
#define CPU_DEFAULT_FEATURES (CPU_FEATURE_FLOAT | CPU_FEATURE_SWAP | \
CPU_FEATURE_MUL | CPU_FEATURE_DIV | \
diff --git a/target-sparc/helper.h b/target-sparc/helper.h
index 2a771b2..cd8d3fa 100644
--- a/target-sparc/helper.h
+++ b/target-sparc/helper.h
@@ -22,7 +22,6 @@ DEF_HELPER_1(popc, tl, tl)
DEF_HELPER_4(ldda_asi, void, env, tl, int, int)
DEF_HELPER_5(ldf_asi, void, env, tl, int, int, int)
DEF_HELPER_5(stf_asi, void, env, tl, int, int, int)
-DEF_HELPER_5(cas_asi, tl, env, tl, tl, tl, i32)
DEF_HELPER_5(casx_asi, tl, env, tl, tl, tl, i32)
DEF_HELPER_2(set_softint, void, env, i64)
DEF_HELPER_2(clear_softint, void, env, i64)
@@ -31,6 +30,9 @@ DEF_HELPER_2(tick_set_count, void, ptr, i64)
DEF_HELPER_1(tick_get_count, i64, ptr)
DEF_HELPER_2(tick_set_limit, void, ptr, i64)
#endif
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+DEF_HELPER_5(cas_asi, tl, env, tl, tl, tl, i32)
+#endif
DEF_HELPER_3(check_align, void, env, tl, i32)
DEF_HELPER_1(debug, void, env)
DEF_HELPER_1(save, void, env)
diff --git a/target-sparc/ldst_helper.c b/target-sparc/ldst_helper.c
index 92761ad..32491b4 100644
--- a/target-sparc/ldst_helper.c
+++ b/target-sparc/ldst_helper.c
@@ -584,6 +584,7 @@ uint64_t helper_ld_asi(CPUSPARCState *env, target_ulong addr, int asi, int size,
}
break;
case 0xb: /* Supervisor data access */
+ case 0x80:
switch (size) {
case 1:
ret = cpu_ldub_kernel(env, addr);
@@ -955,6 +956,7 @@ void helper_st_asi(CPUSPARCState *env, target_ulong addr, uint64_t val, int asi,
}
break;
case 0xb: /* Supervisor data access */
+ case 0x80:
switch (size) {
case 1:
cpu_stb_kernel(env, addr, val);
@@ -2232,33 +2234,35 @@ void helper_stf_asi(CPUSPARCState *env, target_ulong addr, int asi, int size,
}
}
-target_ulong helper_cas_asi(CPUSPARCState *env, target_ulong addr,
- target_ulong val1, target_ulong val2, uint32_t asi)
+target_ulong helper_casx_asi(CPUSPARCState *env, target_ulong addr,
+ target_ulong val1, target_ulong val2,
+ uint32_t asi)
{
target_ulong ret;
- val2 &= 0xffffffffUL;
- ret = helper_ld_asi(env, addr, asi, 4, 0);
- ret &= 0xffffffffUL;
+ ret = helper_ld_asi(env, addr, asi, 8, 0);
if (val2 == ret) {
- helper_st_asi(env, addr, val1 & 0xffffffffUL, asi, 4);
+ helper_st_asi(env, addr, val1, asi, 8);
}
return ret;
}
+#endif /* TARGET_SPARC64 */
-target_ulong helper_casx_asi(CPUSPARCState *env, target_ulong addr,
- target_ulong val1, target_ulong val2,
- uint32_t asi)
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+target_ulong helper_cas_asi(CPUSPARCState *env, target_ulong addr,
+ target_ulong val1, target_ulong val2, uint32_t asi)
{
target_ulong ret;
- ret = helper_ld_asi(env, addr, asi, 8, 0);
+ val2 &= 0xffffffffUL;
+ ret = helper_ld_asi(env, addr, asi, 4, 0);
+ ret &= 0xffffffffUL;
if (val2 == ret) {
- helper_st_asi(env, addr, val1, asi, 8);
+ helper_st_asi(env, addr, val1 & 0xffffffffUL, asi, 4);
}
return ret;
}
-#endif /* TARGET_SPARC64 */
+#endif /* !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64) */
void helper_ldqf(CPUSPARCState *env, target_ulong addr, int mem_idx)
{
diff --git a/target-sparc/translate.c b/target-sparc/translate.c
index 6150b22..7481c85 100644
--- a/target-sparc/translate.c
+++ b/target-sparc/translate.c
@@ -2107,18 +2107,6 @@ static inline void gen_stda_asi(DisasContext *dc, TCGv hi, TCGv addr,
tcg_temp_free_i64(t64);
}
-static inline void gen_cas_asi(DisasContext *dc, TCGv addr,
- TCGv val2, int insn, int rd)
-{
- TCGv val1 = gen_load_gpr(dc, rd);
- TCGv dst = gen_dest_gpr(dc, rd);
- TCGv_i32 r_asi = gen_get_asi(insn, addr);
-
- gen_helper_cas_asi(dst, cpu_env, addr, val1, val2, r_asi);
- tcg_temp_free_i32(r_asi);
- gen_store_gpr(dc, rd, dst);
-}
-
static inline void gen_casx_asi(DisasContext *dc, TCGv addr,
TCGv val2, int insn, int rd)
{
@@ -2229,6 +2217,22 @@ static inline void gen_stda_asi(DisasContext *dc, TCGv hi, TCGv addr,
#endif
#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+static inline void gen_cas_asi(DisasContext *dc, TCGv addr,
+ TCGv val2, int insn, int rd)
+{
+ TCGv val1 = gen_load_gpr(dc, rd);
+ TCGv dst = gen_dest_gpr(dc, rd);
+#ifdef TARGET_SPARC64
+ TCGv_i32 r_asi = gen_get_asi(insn, addr);
+#else
+ TCGv_i32 r_asi = tcg_const_i32(GET_FIELD(insn, 19, 26));
+#endif
+
+ gen_helper_cas_asi(dst, cpu_env, addr, val1, val2, r_asi);
+ tcg_temp_free_i32(r_asi);
+ gen_store_gpr(dc, rd, dst);
+}
+
static inline void gen_ldstub_asi(TCGv dst, TCGv addr, int insn)
{
TCGv_i64 r_val;
@@ -5103,11 +5107,6 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
}
gen_stf_asi(cpu_addr, insn, 8, DFPREG(rd));
break;
- case 0x3c: /* V9 casa */
- rs2 = GET_FIELD(insn, 27, 31);
- cpu_src2 = gen_load_gpr(dc, rs2);
- gen_cas_asi(dc, cpu_addr, cpu_src2, insn, rd);
- break;
case 0x3e: /* V9 casxa */
rs2 = GET_FIELD(insn, 27, 31);
cpu_src2 = gen_load_gpr(dc, rs2);
@@ -5120,6 +5119,20 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
case 0x37: /* stdc */
goto ncp_insn;
#endif
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+ case 0x3c: /* V9 or LEON3 casa */
+ CHECK_FPU_FEATURE(dc, CASA);
+#ifndef TARGET_SPARC64
+ if (IS_IMM)
+ goto illegal_insn;
+ if (!supervisor(dc))
+ goto priv_insn;
+#endif
+ rs2 = GET_FIELD(insn, 27, 31);
+ cpu_src2 = gen_load_gpr(dc, rs2);
+ gen_cas_asi(dc, cpu_addr, cpu_src2, insn, rd);
+ break;
+#endif
default:
goto illegal_insn;
}
--
1.7.7
^ permalink raw reply related [flat|nested] 11+ messages in thread* Re: [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2014-02-13 9:52 [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA Sebastian Huber
@ 2014-02-13 12:01 ` Fabien Chouteau
2014-02-13 13:00 ` Sebastian Huber
0 siblings, 1 reply; 11+ messages in thread
From: Fabien Chouteau @ 2014-02-13 12:01 UTC (permalink / raw)
To: Sebastian Huber, qemu-devel; +Cc: blauwirbel
On 02/13/2014 10:52 AM, Sebastian Huber wrote:
> The LEON3 processor has support for the CASA instruction which is
> normally only available for SPARC V9 processors. Binutils 2.24
> and GCC 4.9 will support this instruction for LEON3. GCC uses it to
> generate C11 atomic operations.
>
> The CAS synthetic instruction uses an ASI of 0x80. If TARGET_SPARC64 is
> not defined use a supervisor data load/store for an ASI of 0x80 in
> helper_ld_asi()/helper_st_asi().
>
Hello Sebastian,
If I understand correctly, the difference with V1 is that ASI 0x80. Why
did you chose Supervisor data access against User data access? (I cannot
find documentation about 0x80 ASI)
Thanks,
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2014-02-13 12:01 ` Fabien Chouteau
@ 2014-02-13 13:00 ` Sebastian Huber
2014-02-13 14:55 ` Fabien Chouteau
0 siblings, 1 reply; 11+ messages in thread
From: Sebastian Huber @ 2014-02-13 13:00 UTC (permalink / raw)
To: Fabien Chouteau; +Cc: blauwirbel, qemu-devel
On 2014-02-13 13:01, Fabien Chouteau wrote:
> On 02/13/2014 10:52 AM, Sebastian Huber wrote:
>> The LEON3 processor has support for the CASA instruction which is
>> normally only available for SPARC V9 processors. Binutils 2.24
>> and GCC 4.9 will support this instruction for LEON3. GCC uses it to
>> generate C11 atomic operations.
>>
>> The CAS synthetic instruction uses an ASI of 0x80. If TARGET_SPARC64 is
>> not defined use a supervisor data load/store for an ASI of 0x80 in
>> helper_ld_asi()/helper_st_asi().
>>
>
> Hello Sebastian,
>
> If I understand correctly, the difference with V1 is that ASI 0x80. Why
> did you chose Supervisor data access against User data access?
User data access would work also. I don't have a preference here.
> (I cannot
> find documentation about 0x80 ASI)
GCC will generate CAS instructions, e.g.
.file "ticket.c"
.section ".text"
.align 4
.global acquire
.type acquire, #function
.proc 020
acquire:
ld [%o0], %g1
mov %g1, %g2
.LL7:
add %g1, 1, %g1
cas [%o0], %g2, %g1
cmp %g1, %g2
bne,a .LL7
mov %g1, %g2
add %o0, 4, %o0
.LL4:
ld [%o0], %g1
cmp %g1, %g2
bne .LL4
nop
jmp %o7+8
nop
.size acquire, .-acquire
.align 4
.global release
.type release, #function
.proc 020
release:
ld [%o0+4], %g1
add %g1, 1, %g1
st %g1, [%o0+4]
jmp %o7+8
nop
.size release, .-release
.ident "GCC: (GNU) 4.9.0 20130917 (experimental)"
In the GNU Binutils you find:
opcodes/sparc-opc.c:{ "cas", F3(3, 0x3c, 0)|ASI(0x80), F3(~3, ~0x3c,
~0)|ASI(~0x80), "[1],2,d", F_ALIAS, 0, v9andleon }, /* casa [rs1]ASI_P,rs2,rd */
This is where the 0x80 comes from.
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.huber@embedded-brains.de
PGP : Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2014-02-13 13:00 ` Sebastian Huber
@ 2014-02-13 14:55 ` Fabien Chouteau
2014-02-13 15:50 ` Fabien Chouteau
0 siblings, 1 reply; 11+ messages in thread
From: Fabien Chouteau @ 2014-02-13 14:55 UTC (permalink / raw)
To: Sebastian Huber; +Cc: blauwirbel, qemu-devel
On 02/13/2014 02:00 PM, Sebastian Huber wrote:
> On 2014-02-13 13:01, Fabien Chouteau wrote:
>> On 02/13/2014 10:52 AM, Sebastian Huber wrote:
>>> The LEON3 processor has support for the CASA instruction which is
>>> normally only available for SPARC V9 processors. Binutils 2.24
>>> and GCC 4.9 will support this instruction for LEON3. GCC uses it to
>>> generate C11 atomic operations.
>>>
>>> The CAS synthetic instruction uses an ASI of 0x80. If TARGET_SPARC64 is
>>> not defined use a supervisor data load/store for an ASI of 0x80 in
>>> helper_ld_asi()/helper_st_asi().
>>>
>>
>> Hello Sebastian,
>>
>> If I understand correctly, the difference with V1 is that ASI 0x80. Why
>> did you chose Supervisor data access against User data access?
>
> User data access would work also. I don't have a preference here.
>
>> (I cannot
>> find documentation about 0x80 ASI)
>
> GCC will generate CAS instructions, e.g.
...
> In the GNU Binutils you find:
>
> opcodes/sparc-opc.c:{ "cas", F3(3, 0x3c, 0)|ASI(0x80), F3(~3, ~0x3c, ~0)|ASI(~0x80), "[1],2,d", F_ALIAS, 0, v9andleon }, /* casa [rs1]ASI_P,rs2,rd */
>
> This is where the 0x80 comes from.
>
In some leon3 doc I found this:
62.2.7 Compare and Swap instruction (CASA)
LEON3 implements the SPARC V9 Compare and Swap Alternative (CASA) instruction. The CASA
is enabled the interger load delay is set to 1 and the NOTAG generic is 0. The CASA operates as
described in the SPARC V9 manual. The instruction is privileged but setting ASI = 0xA (user data)
will allow it to be used in user mode.
Which confirm privileged instruction. I will ask our GCC expert if they
know where that 0x80 ASI comes from.
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2014-02-13 14:55 ` Fabien Chouteau
@ 2014-02-13 15:50 ` Fabien Chouteau
2014-02-14 8:41 ` Sebastian Huber
0 siblings, 1 reply; 11+ messages in thread
From: Fabien Chouteau @ 2014-02-13 15:50 UTC (permalink / raw)
To: Sebastian Huber; +Cc: blauwirbel, qemu-devel
On 02/13/2014 03:55 PM, Fabien Chouteau wrote:
> On 02/13/2014 02:00 PM, Sebastian Huber wrote:
>> On 2014-02-13 13:01, Fabien Chouteau wrote:
>>> On 02/13/2014 10:52 AM, Sebastian Huber wrote:
>>>> The LEON3 processor has support for the CASA instruction which is
>>>> normally only available for SPARC V9 processors. Binutils 2.24
>>>> and GCC 4.9 will support this instruction for LEON3. GCC uses it to
>>>> generate C11 atomic operations.
>>>>
>>>> The CAS synthetic instruction uses an ASI of 0x80. If TARGET_SPARC64 is
>>>> not defined use a supervisor data load/store for an ASI of 0x80 in
>>>> helper_ld_asi()/helper_st_asi().
>>>>
>>>
>>> Hello Sebastian,
>>>
>>> If I understand correctly, the difference with V1 is that ASI 0x80. Why
>>> did you chose Supervisor data access against User data access?
>>
>> User data access would work also. I don't have a preference here.
>>
>>> (I cannot
>>> find documentation about 0x80 ASI)
>>
>> GCC will generate CAS instructions, e.g.
>
> ...
>
>> In the GNU Binutils you find:
>>
>> opcodes/sparc-opc.c:{ "cas", F3(3, 0x3c, 0)|ASI(0x80), F3(~3, ~0x3c, ~0)|ASI(~0x80), "[1],2,d", F_ALIAS, 0, v9andleon }, /* casa [rs1]ASI_P,rs2,rd */
>>
>> This is where the 0x80 comes from.
>>
>
> In some leon3 doc I found this:
>
> 62.2.7 Compare and Swap instruction (CASA)
> LEON3 implements the SPARC V9 Compare and Swap Alternative (CASA) instruction. The CASA
> is enabled the interger load delay is set to 1 and the NOTAG generic is 0. The CASA operates as
> described in the SPARC V9 manual. The instruction is privileged but setting ASI = 0xA (user data)
> will allow it to be used in user mode.
>
> Which confirm privileged instruction. I will ask our GCC expert if they
> know where that 0x80 ASI comes from.
>
This ASI 0x80 is really defined nowhere in Leon3 not even in the sources :)
Maybe there's a bug in binutils... Did you try to run this program on a real board?
--- sparc.vhd ---
subtype asi_type is std_logic_vector(4 downto 0);
constant ASI_SYSR : asi_type := "00010"; -- 0x02
constant ASI_UINST : asi_type := "01000"; -- 0x08
constant ASI_SINST : asi_type := "01001"; -- 0x09
constant ASI_UDATA : asi_type := "01010"; -- 0x0A
constant ASI_SDATA : asi_type := "01011"; -- 0x0B
constant ASI_ITAG : asi_type := "01100"; -- 0x0C
constant ASI_IDATA : asi_type := "01101"; -- 0x0D
constant ASI_DTAG : asi_type := "01110"; -- 0x0E
constant ASI_DDATA : asi_type := "01111"; -- 0x0F
constant ASI_IFLUSH : asi_type := "10000"; -- 0x10
constant ASI_DFLUSH : asi_type := "10001"; -- 0x11
constant ASI_FLUSH_PAGE : std_logic_vector(4 downto 0) := "10000"; -- 0x10 i/dcache flush page
constant ASI_FLUSH_CTX : std_logic_vector(4 downto 0) := "10011"; -- 0x13 i/dcache flush ctx
constant ASI_DCTX : std_logic_vector(4 downto 0) := "10100"; -- 0x14 dcache ctx
constant ASI_ICTX : std_logic_vector(4 downto 0) := "10101"; -- 0x15 icache ctx
constant ASI_MMUFLUSHPROBE : std_logic_vector(4 downto 0) := "11000"; -- 0x18 i/dtlb flush/(probe)
constant ASI_MMUREGS : std_logic_vector(4 downto 0) := "11001"; -- 0x19 mmu regs access
constant ASI_MMU_BP : std_logic_vector(4 downto 0) := "11100"; -- 0x1c mmu Bypass
constant ASI_MMU_DIAG : std_logic_vector(4 downto 0) := "11101"; -- 0x1d mmu diagnostic
--constant ASI_MMU_DSU : std_logic_vector(4 downto 0) := "11111"; -- 0x1f mmu diagnostic
constant ASI_MMUSNOOP_DTAG : std_logic_vector(4 downto 0) := "11110"; -- 0x1e mmusnoop physical dtag
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2014-02-13 15:50 ` Fabien Chouteau
@ 2014-02-14 8:41 ` Sebastian Huber
2014-02-14 13:44 ` Fabien Chouteau
0 siblings, 1 reply; 11+ messages in thread
From: Sebastian Huber @ 2014-02-14 8:41 UTC (permalink / raw)
To: Fabien Chouteau; +Cc: blauwirbel, qemu-devel
On 2014-02-13 16:50, Fabien Chouteau wrote:
> On 02/13/2014 03:55 PM, Fabien Chouteau wrote:
>> On 02/13/2014 02:00 PM, Sebastian Huber wrote:
>>> On 2014-02-13 13:01, Fabien Chouteau wrote:
>>>> On 02/13/2014 10:52 AM, Sebastian Huber wrote:
>>>>> The LEON3 processor has support for the CASA instruction which is
>>>>> normally only available for SPARC V9 processors. Binutils 2.24
>>>>> and GCC 4.9 will support this instruction for LEON3. GCC uses it to
>>>>> generate C11 atomic operations.
>>>>>
>>>>> The CAS synthetic instruction uses an ASI of 0x80. If TARGET_SPARC64 is
>>>>> not defined use a supervisor data load/store for an ASI of 0x80 in
>>>>> helper_ld_asi()/helper_st_asi().
>>>>>
>>>>
>>>> Hello Sebastian,
>>>>
>>>> If I understand correctly, the difference with V1 is that ASI 0x80. Why
>>>> did you chose Supervisor data access against User data access?
>>>
>>> User data access would work also. I don't have a preference here.
>>>
>>>> (I cannot
>>>> find documentation about 0x80 ASI)
>>>
>>> GCC will generate CAS instructions, e.g.
>>
>> ...
>>
>>> In the GNU Binutils you find:
>>>
>>> opcodes/sparc-opc.c:{ "cas", F3(3, 0x3c, 0)|ASI(0x80), F3(~3, ~0x3c, ~0)|ASI(~0x80), "[1],2,d", F_ALIAS, 0, v9andleon }, /* casa [rs1]ASI_P,rs2,rd */
>>>
>>> This is where the 0x80 comes from.
>>>
>>
>> In some leon3 doc I found this:
>>
>> 62.2.7 Compare and Swap instruction (CASA)
>> LEON3 implements the SPARC V9 Compare and Swap Alternative (CASA) instruction. The CASA
>> is enabled the interger load delay is set to 1 and the NOTAG generic is 0. The CASA operates as
>> described in the SPARC V9 manual. The instruction is privileged but setting ASI = 0xA (user data)
>> will allow it to be used in user mode.
>>
>> Which confirm privileged instruction. I will ask our GCC expert if they
>> know where that 0x80 ASI comes from.
>>
>
> This ASI 0x80 is really defined nowhere in Leon3 not even in the sources :)
> Maybe there's a bug in binutils... Did you try to run this program on a real board?
Yes, I tested it on a NGMP board with a LEON4 processor (documentation is the
same for CAS as in LEON3).
The ASI 0x80 is defined in the SPARC V9 manual, Table 12—Address Space
Identifiers (ASIs). Here we have:
0x80, ASI_PRIMARY, Unrestricted access, Primary address space
So should I change it to use User Data Access?
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.huber@embedded-brains.de
PGP : Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2014-02-14 8:41 ` Sebastian Huber
@ 2014-02-14 13:44 ` Fabien Chouteau
2014-02-14 13:55 ` Andreas Färber
0 siblings, 1 reply; 11+ messages in thread
From: Fabien Chouteau @ 2014-02-14 13:44 UTC (permalink / raw)
To: Sebastian Huber; +Cc: blauwirbel, qemu-devel
On 02/14/2014 09:41 AM, Sebastian Huber wrote:
> On 2014-02-13 16:50, Fabien Chouteau wrote:
>>
>> This ASI 0x80 is really defined nowhere in Leon3 not even in the sources :)
>> Maybe there's a bug in binutils... Did you try to run this program on a real board?
>
> Yes, I tested it on a NGMP board with a LEON4 processor (documentation is the same for CAS as in LEON3).
>
Alright so we can use the patch as is.
> The ASI 0x80 is defined in the SPARC V9 manual, Table 12—Address Space Identifiers (ASIs). Here we have:
>
> 0x80, ASI_PRIMARY, Unrestricted access, Primary address space
>
> So should I change it to use User Data Access?
>
No I think supervisor data access closer to the definition in Leon3's doc.
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2014-02-14 13:44 ` Fabien Chouteau
@ 2014-02-14 13:55 ` Andreas Färber
0 siblings, 0 replies; 11+ messages in thread
From: Andreas Färber @ 2014-02-14 13:55 UTC (permalink / raw)
To: Fabien Chouteau, Sebastian Huber; +Cc: blauwirbel, qemu-devel
Am 14.02.2014 14:44, schrieb Fabien Chouteau:
> On 02/14/2014 09:41 AM, Sebastian Huber wrote:
>> On 2014-02-13 16:50, Fabien Chouteau wrote:
>>>
>>> This ASI 0x80 is really defined nowhere in Leon3 not even in the sources :)
>>> Maybe there's a bug in binutils... Did you try to run this program on a real board?
>>
>> Yes, I tested it on a NGMP board with a LEON4 processor (documentation is the same for CAS as in LEON3).
>>
>
> Alright so we can use the patch as is.
Please use "target-sparc:". We're not Linux, and let's please keep it
consistent here.
Andreas
--
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Qemu-devel] [PATCH] SPARC: Add and use CPU_FEATURE_CASA
@ 2013-11-26 14:04 Sebastian Huber
2013-11-28 10:27 ` [Qemu-devel] [PATCH v2] " Sebastian Huber
0 siblings, 1 reply; 11+ messages in thread
From: Sebastian Huber @ 2013-11-26 14:04 UTC (permalink / raw)
To: qemu-devel; +Cc: Sebastian Huber, Fabien Chouteau
The LEON3 processor has support for the CASA instruction which is
normally only available for SPARC V9 processors. Binutils 2.24
and GCC 4.9 will support this instruction for LEON3. GCC uses it to
generate C11 atomic operations.
---
target-sparc/cpu.c | 3 +-
target-sparc/cpu.h | 4 ++-
target-sparc/helper.h | 4 ++-
target-sparc/ldst_helper.c | 26 +++++++++++++-----------
target-sparc/translate.c | 47 ++++++++++++++++++++++++++++---------------
5 files changed, 52 insertions(+), 32 deletions(-)
diff --git a/target-sparc/cpu.c b/target-sparc/cpu.c
index e7f878e..5806e59 100644
--- a/target-sparc/cpu.c
+++ b/target-sparc/cpu.c
@@ -458,7 +458,8 @@ static const sparc_def_t sparc_defs[] = {
.mmu_trcr_mask = 0xffffffff,
.nwindows = 8,
.features = CPU_DEFAULT_FEATURES | CPU_FEATURE_TA0_SHUTDOWN |
- CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL | CPU_FEATURE_POWERDOWN,
+ CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL | CPU_FEATURE_POWERDOWN |
+ CPU_FEATURE_CASA,
},
#endif
};
diff --git a/target-sparc/cpu.h b/target-sparc/cpu.h
index 41194ec..f87d7fb 100644
--- a/target-sparc/cpu.h
+++ b/target-sparc/cpu.h
@@ -271,12 +271,14 @@ typedef struct sparc_def_t {
#define CPU_FEATURE_ASR17 (1 << 15)
#define CPU_FEATURE_CACHE_CTRL (1 << 16)
#define CPU_FEATURE_POWERDOWN (1 << 17)
+#define CPU_FEATURE_CASA (1 << 18)
#ifndef TARGET_SPARC64
#define CPU_DEFAULT_FEATURES (CPU_FEATURE_FLOAT | CPU_FEATURE_SWAP | \
CPU_FEATURE_MUL | CPU_FEATURE_DIV | \
CPU_FEATURE_FLUSH | CPU_FEATURE_FSQRT | \
- CPU_FEATURE_FMUL | CPU_FEATURE_FSMULD)
+ CPU_FEATURE_FMUL | CPU_FEATURE_FSMULD | \
+ CPU_FEATURE_CASA)
#else
#define CPU_DEFAULT_FEATURES (CPU_FEATURE_FLOAT | CPU_FEATURE_SWAP | \
CPU_FEATURE_MUL | CPU_FEATURE_DIV | \
diff --git a/target-sparc/helper.h b/target-sparc/helper.h
index 5e0eea1..9c4fd56 100644
--- a/target-sparc/helper.h
+++ b/target-sparc/helper.h
@@ -22,7 +22,6 @@ DEF_HELPER_1(popc, tl, tl)
DEF_HELPER_4(ldda_asi, void, env, tl, int, int)
DEF_HELPER_5(ldf_asi, void, env, tl, int, int, int)
DEF_HELPER_5(stf_asi, void, env, tl, int, int, int)
-DEF_HELPER_5(cas_asi, tl, env, tl, tl, tl, i32)
DEF_HELPER_5(casx_asi, tl, env, tl, tl, tl, i32)
DEF_HELPER_2(set_softint, void, env, i64)
DEF_HELPER_2(clear_softint, void, env, i64)
@@ -31,6 +30,9 @@ DEF_HELPER_2(tick_set_count, void, ptr, i64)
DEF_HELPER_1(tick_get_count, i64, ptr)
DEF_HELPER_2(tick_set_limit, void, ptr, i64)
#endif
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+DEF_HELPER_5(cas_asi, tl, env, tl, tl, tl, i32)
+#endif
DEF_HELPER_3(check_align, void, env, tl, i32)
DEF_HELPER_1(debug, void, env)
DEF_HELPER_1(save, void, env)
diff --git a/target-sparc/ldst_helper.c b/target-sparc/ldst_helper.c
index 2936b58..c51b9b0 100644
--- a/target-sparc/ldst_helper.c
+++ b/target-sparc/ldst_helper.c
@@ -2224,33 +2224,35 @@ void helper_stf_asi(CPUSPARCState *env, target_ulong addr, int asi, int size,
}
}
-target_ulong helper_cas_asi(CPUSPARCState *env, target_ulong addr,
- target_ulong val1, target_ulong val2, uint32_t asi)
+target_ulong helper_casx_asi(CPUSPARCState *env, target_ulong addr,
+ target_ulong val1, target_ulong val2,
+ uint32_t asi)
{
target_ulong ret;
- val2 &= 0xffffffffUL;
- ret = helper_ld_asi(env, addr, asi, 4, 0);
- ret &= 0xffffffffUL;
+ ret = helper_ld_asi(env, addr, asi, 8, 0);
if (val2 == ret) {
- helper_st_asi(env, addr, val1 & 0xffffffffUL, asi, 4);
+ helper_st_asi(env, addr, val1, asi, 8);
}
return ret;
}
+#endif /* TARGET_SPARC64 */
-target_ulong helper_casx_asi(CPUSPARCState *env, target_ulong addr,
- target_ulong val1, target_ulong val2,
- uint32_t asi)
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+target_ulong helper_cas_asi(CPUSPARCState *env, target_ulong addr,
+ target_ulong val1, target_ulong val2, uint32_t asi)
{
target_ulong ret;
- ret = helper_ld_asi(env, addr, asi, 8, 0);
+ val2 &= 0xffffffffUL;
+ ret = helper_ld_asi(env, addr, asi, 4, 0);
+ ret &= 0xffffffffUL;
if (val2 == ret) {
- helper_st_asi(env, addr, val1, asi, 8);
+ helper_st_asi(env, addr, val1 & 0xffffffffUL, asi, 4);
}
return ret;
}
-#endif /* TARGET_SPARC64 */
+#endif /* !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64) */
void helper_ldqf(CPUSPARCState *env, target_ulong addr, int mem_idx)
{
diff --git a/target-sparc/translate.c b/target-sparc/translate.c
index 38b4519..86743dc 100644
--- a/target-sparc/translate.c
+++ b/target-sparc/translate.c
@@ -2107,18 +2107,6 @@ static inline void gen_stda_asi(DisasContext *dc, TCGv hi, TCGv addr,
tcg_temp_free_i64(t64);
}
-static inline void gen_cas_asi(DisasContext *dc, TCGv addr,
- TCGv val2, int insn, int rd)
-{
- TCGv val1 = gen_load_gpr(dc, rd);
- TCGv dst = gen_dest_gpr(dc, rd);
- TCGv_i32 r_asi = gen_get_asi(insn, addr);
-
- gen_helper_cas_asi(dst, cpu_env, addr, val1, val2, r_asi);
- tcg_temp_free_i32(r_asi);
- gen_store_gpr(dc, rd, dst);
-}
-
static inline void gen_casx_asi(DisasContext *dc, TCGv addr,
TCGv val2, int insn, int rd)
{
@@ -2229,6 +2217,22 @@ static inline void gen_stda_asi(DisasContext *dc, TCGv hi, TCGv addr,
#endif
#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+static inline void gen_cas_asi(DisasContext *dc, TCGv addr,
+ TCGv val2, int insn, int rd)
+{
+ TCGv val1 = gen_load_gpr(dc, rd);
+ TCGv dst = gen_dest_gpr(dc, rd);
+#ifdef TARGET_SPARC64
+ TCGv_i32 r_asi = gen_get_asi(insn, addr);
+#else
+ TCGv_i32 r_asi = tcg_const_i32(GET_FIELD(insn, 19, 26));
+#endif
+
+ gen_helper_cas_asi(dst, cpu_env, addr, val1, val2, r_asi);
+ tcg_temp_free_i32(r_asi);
+ gen_store_gpr(dc, rd, dst);
+}
+
static inline void gen_ldstub_asi(TCGv dst, TCGv addr, int insn)
{
TCGv_i64 r_val;
@@ -5103,11 +5107,6 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
}
gen_stf_asi(cpu_addr, insn, 8, DFPREG(rd));
break;
- case 0x3c: /* V9 casa */
- rs2 = GET_FIELD(insn, 27, 31);
- cpu_src2 = gen_load_gpr(dc, rs2);
- gen_cas_asi(dc, cpu_addr, cpu_src2, insn, rd);
- break;
case 0x3e: /* V9 casxa */
rs2 = GET_FIELD(insn, 27, 31);
cpu_src2 = gen_load_gpr(dc, rs2);
@@ -5120,6 +5119,20 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
case 0x37: /* stdc */
goto ncp_insn;
#endif
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+ case 0x3c: /* V9 or LEON3 casa */
+ CHECK_FPU_FEATURE(dc, CASA);
+#ifndef TARGET_SPARC64
+ if (IS_IMM)
+ goto illegal_insn;
+ if (!supervisor(dc))
+ goto priv_insn;
+#endif
+ rs2 = GET_FIELD(insn, 27, 31);
+ cpu_src2 = gen_load_gpr(dc, rs2);
+ gen_cas_asi(dc, cpu_addr, cpu_src2, insn, rd);
+ break;
+#endif
default:
goto illegal_insn;
}
--
1.7.7
^ permalink raw reply related [flat|nested] 11+ messages in thread* [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2013-11-26 14:04 [Qemu-devel] [PATCH] " Sebastian Huber
@ 2013-11-28 10:27 ` Sebastian Huber
2013-12-10 8:09 ` Sebastian Huber
0 siblings, 1 reply; 11+ messages in thread
From: Sebastian Huber @ 2013-11-28 10:27 UTC (permalink / raw)
To: qemu-devel; +Cc: Sebastian Huber, Fabien Chouteau
The LEON3 processor has support for the CASA instruction which is
normally only available for SPARC V9 processors. Binutils 2.24
and GCC 4.9 will support this instruction for LEON3. GCC uses it to
generate C11 atomic operations.
The CAS synthetic instruction uses an ASI of 0x80. If TARGET_SPARC64 is
not defined use a supervisor data load/store for an ASI of 0x80 in
helper_ld_asi()/helper_st_asi().
---
target-sparc/cpu.c | 3 +-
target-sparc/cpu.h | 4 ++-
target-sparc/helper.h | 4 ++-
target-sparc/ldst_helper.c | 28 +++++++++++++++-----------
target-sparc/translate.c | 47 ++++++++++++++++++++++++++++---------------
5 files changed, 54 insertions(+), 32 deletions(-)
diff --git a/target-sparc/cpu.c b/target-sparc/cpu.c
index e7f878e..5806e59 100644
--- a/target-sparc/cpu.c
+++ b/target-sparc/cpu.c
@@ -458,7 +458,8 @@ static const sparc_def_t sparc_defs[] = {
.mmu_trcr_mask = 0xffffffff,
.nwindows = 8,
.features = CPU_DEFAULT_FEATURES | CPU_FEATURE_TA0_SHUTDOWN |
- CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL | CPU_FEATURE_POWERDOWN,
+ CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL | CPU_FEATURE_POWERDOWN |
+ CPU_FEATURE_CASA,
},
#endif
};
diff --git a/target-sparc/cpu.h b/target-sparc/cpu.h
index 41194ec..f87d7fb 100644
--- a/target-sparc/cpu.h
+++ b/target-sparc/cpu.h
@@ -271,12 +271,14 @@ typedef struct sparc_def_t {
#define CPU_FEATURE_ASR17 (1 << 15)
#define CPU_FEATURE_CACHE_CTRL (1 << 16)
#define CPU_FEATURE_POWERDOWN (1 << 17)
+#define CPU_FEATURE_CASA (1 << 18)
#ifndef TARGET_SPARC64
#define CPU_DEFAULT_FEATURES (CPU_FEATURE_FLOAT | CPU_FEATURE_SWAP | \
CPU_FEATURE_MUL | CPU_FEATURE_DIV | \
CPU_FEATURE_FLUSH | CPU_FEATURE_FSQRT | \
- CPU_FEATURE_FMUL | CPU_FEATURE_FSMULD)
+ CPU_FEATURE_FMUL | CPU_FEATURE_FSMULD | \
+ CPU_FEATURE_CASA)
#else
#define CPU_DEFAULT_FEATURES (CPU_FEATURE_FLOAT | CPU_FEATURE_SWAP | \
CPU_FEATURE_MUL | CPU_FEATURE_DIV | \
diff --git a/target-sparc/helper.h b/target-sparc/helper.h
index 2a771b2..cd8d3fa 100644
--- a/target-sparc/helper.h
+++ b/target-sparc/helper.h
@@ -22,7 +22,6 @@ DEF_HELPER_1(popc, tl, tl)
DEF_HELPER_4(ldda_asi, void, env, tl, int, int)
DEF_HELPER_5(ldf_asi, void, env, tl, int, int, int)
DEF_HELPER_5(stf_asi, void, env, tl, int, int, int)
-DEF_HELPER_5(cas_asi, tl, env, tl, tl, tl, i32)
DEF_HELPER_5(casx_asi, tl, env, tl, tl, tl, i32)
DEF_HELPER_2(set_softint, void, env, i64)
DEF_HELPER_2(clear_softint, void, env, i64)
@@ -31,6 +30,9 @@ DEF_HELPER_2(tick_set_count, void, ptr, i64)
DEF_HELPER_1(tick_get_count, i64, ptr)
DEF_HELPER_2(tick_set_limit, void, ptr, i64)
#endif
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+DEF_HELPER_5(cas_asi, tl, env, tl, tl, tl, i32)
+#endif
DEF_HELPER_3(check_align, void, env, tl, i32)
DEF_HELPER_1(debug, void, env)
DEF_HELPER_1(save, void, env)
diff --git a/target-sparc/ldst_helper.c b/target-sparc/ldst_helper.c
index 2936b58..fd594c1 100644
--- a/target-sparc/ldst_helper.c
+++ b/target-sparc/ldst_helper.c
@@ -583,6 +583,7 @@ uint64_t helper_ld_asi(CPUSPARCState *env, target_ulong addr, int asi, int size,
}
break;
case 0xb: /* Supervisor data access */
+ case 0x80:
switch (size) {
case 1:
ret = cpu_ldub_kernel(env, addr);
@@ -949,6 +950,7 @@ void helper_st_asi(CPUSPARCState *env, target_ulong addr, uint64_t val, int asi,
}
break;
case 0xb: /* Supervisor data access */
+ case 0x80:
switch (size) {
case 1:
cpu_stb_kernel(env, addr, val);
@@ -2224,33 +2226,35 @@ void helper_stf_asi(CPUSPARCState *env, target_ulong addr, int asi, int size,
}
}
-target_ulong helper_cas_asi(CPUSPARCState *env, target_ulong addr,
- target_ulong val1, target_ulong val2, uint32_t asi)
+target_ulong helper_casx_asi(CPUSPARCState *env, target_ulong addr,
+ target_ulong val1, target_ulong val2,
+ uint32_t asi)
{
target_ulong ret;
- val2 &= 0xffffffffUL;
- ret = helper_ld_asi(env, addr, asi, 4, 0);
- ret &= 0xffffffffUL;
+ ret = helper_ld_asi(env, addr, asi, 8, 0);
if (val2 == ret) {
- helper_st_asi(env, addr, val1 & 0xffffffffUL, asi, 4);
+ helper_st_asi(env, addr, val1, asi, 8);
}
return ret;
}
+#endif /* TARGET_SPARC64 */
-target_ulong helper_casx_asi(CPUSPARCState *env, target_ulong addr,
- target_ulong val1, target_ulong val2,
- uint32_t asi)
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+target_ulong helper_cas_asi(CPUSPARCState *env, target_ulong addr,
+ target_ulong val1, target_ulong val2, uint32_t asi)
{
target_ulong ret;
- ret = helper_ld_asi(env, addr, asi, 8, 0);
+ val2 &= 0xffffffffUL;
+ ret = helper_ld_asi(env, addr, asi, 4, 0);
+ ret &= 0xffffffffUL;
if (val2 == ret) {
- helper_st_asi(env, addr, val1, asi, 8);
+ helper_st_asi(env, addr, val1 & 0xffffffffUL, asi, 4);
}
return ret;
}
-#endif /* TARGET_SPARC64 */
+#endif /* !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64) */
void helper_ldqf(CPUSPARCState *env, target_ulong addr, int mem_idx)
{
diff --git a/target-sparc/translate.c b/target-sparc/translate.c
index 6150b22..7481c85 100644
--- a/target-sparc/translate.c
+++ b/target-sparc/translate.c
@@ -2107,18 +2107,6 @@ static inline void gen_stda_asi(DisasContext *dc, TCGv hi, TCGv addr,
tcg_temp_free_i64(t64);
}
-static inline void gen_cas_asi(DisasContext *dc, TCGv addr,
- TCGv val2, int insn, int rd)
-{
- TCGv val1 = gen_load_gpr(dc, rd);
- TCGv dst = gen_dest_gpr(dc, rd);
- TCGv_i32 r_asi = gen_get_asi(insn, addr);
-
- gen_helper_cas_asi(dst, cpu_env, addr, val1, val2, r_asi);
- tcg_temp_free_i32(r_asi);
- gen_store_gpr(dc, rd, dst);
-}
-
static inline void gen_casx_asi(DisasContext *dc, TCGv addr,
TCGv val2, int insn, int rd)
{
@@ -2229,6 +2217,22 @@ static inline void gen_stda_asi(DisasContext *dc, TCGv hi, TCGv addr,
#endif
#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+static inline void gen_cas_asi(DisasContext *dc, TCGv addr,
+ TCGv val2, int insn, int rd)
+{
+ TCGv val1 = gen_load_gpr(dc, rd);
+ TCGv dst = gen_dest_gpr(dc, rd);
+#ifdef TARGET_SPARC64
+ TCGv_i32 r_asi = gen_get_asi(insn, addr);
+#else
+ TCGv_i32 r_asi = tcg_const_i32(GET_FIELD(insn, 19, 26));
+#endif
+
+ gen_helper_cas_asi(dst, cpu_env, addr, val1, val2, r_asi);
+ tcg_temp_free_i32(r_asi);
+ gen_store_gpr(dc, rd, dst);
+}
+
static inline void gen_ldstub_asi(TCGv dst, TCGv addr, int insn)
{
TCGv_i64 r_val;
@@ -5103,11 +5107,6 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
}
gen_stf_asi(cpu_addr, insn, 8, DFPREG(rd));
break;
- case 0x3c: /* V9 casa */
- rs2 = GET_FIELD(insn, 27, 31);
- cpu_src2 = gen_load_gpr(dc, rs2);
- gen_cas_asi(dc, cpu_addr, cpu_src2, insn, rd);
- break;
case 0x3e: /* V9 casxa */
rs2 = GET_FIELD(insn, 27, 31);
cpu_src2 = gen_load_gpr(dc, rs2);
@@ -5120,6 +5119,20 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
case 0x37: /* stdc */
goto ncp_insn;
#endif
+#if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
+ case 0x3c: /* V9 or LEON3 casa */
+ CHECK_FPU_FEATURE(dc, CASA);
+#ifndef TARGET_SPARC64
+ if (IS_IMM)
+ goto illegal_insn;
+ if (!supervisor(dc))
+ goto priv_insn;
+#endif
+ rs2 = GET_FIELD(insn, 27, 31);
+ cpu_src2 = gen_load_gpr(dc, rs2);
+ gen_cas_asi(dc, cpu_addr, cpu_src2, insn, rd);
+ break;
+#endif
default:
goto illegal_insn;
}
--
1.7.7
^ permalink raw reply related [flat|nested] 11+ messages in thread* Re: [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA
2013-11-28 10:27 ` [Qemu-devel] [PATCH v2] " Sebastian Huber
@ 2013-12-10 8:09 ` Sebastian Huber
2013-12-10 17:16 ` Fabien Chouteau
0 siblings, 1 reply; 11+ messages in thread
From: Sebastian Huber @ 2013-12-10 8:09 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, Fabien Chouteau
Hello,
would someone please have a look at this.
On 2013-11-28 11:27, Sebastian Huber wrote:
> The LEON3 processor has support for the CASA instruction which is
> normally only available for SPARC V9 processors. Binutils 2.24
> and GCC 4.9 will support this instruction for LEON3. GCC uses it to
> generate C11 atomic operations.
>
> The CAS synthetic instruction uses an ASI of 0x80. If TARGET_SPARC64 is
> not defined use a supervisor data load/store for an ASI of 0x80 in
> helper_ld_asi()/helper_st_asi().
> ---
> target-sparc/cpu.c | 3 +-
> target-sparc/cpu.h | 4 ++-
> target-sparc/helper.h | 4 ++-
> target-sparc/ldst_helper.c | 28 +++++++++++++++-----------
> target-sparc/translate.c | 47 ++++++++++++++++++++++++++++---------------
> 5 files changed, 54 insertions(+), 32 deletions(-)
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.huber@embedded-brains.de
PGP : Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2014-02-14 13:55 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-02-13 9:52 [Qemu-devel] [PATCH v2] SPARC: Add and use CPU_FEATURE_CASA Sebastian Huber
2014-02-13 12:01 ` Fabien Chouteau
2014-02-13 13:00 ` Sebastian Huber
2014-02-13 14:55 ` Fabien Chouteau
2014-02-13 15:50 ` Fabien Chouteau
2014-02-14 8:41 ` Sebastian Huber
2014-02-14 13:44 ` Fabien Chouteau
2014-02-14 13:55 ` Andreas Färber
-- strict thread matches above, loose matches on Subject: below --
2013-11-26 14:04 [Qemu-devel] [PATCH] " Sebastian Huber
2013-11-28 10:27 ` [Qemu-devel] [PATCH v2] " Sebastian Huber
2013-12-10 8:09 ` Sebastian Huber
2013-12-10 17:16 ` Fabien Chouteau
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).