* [PATCH 3.16 05/19] MIPS: save/disable MSA in lose_fpu
[not found] <lsq.1491052670.319419763@decadent.org.uk>
@ 2017-04-01 13:17 ` Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 06/19] MIPS: init upper 64b of vector registers when MSA is first used Ben Hutchings
` (4 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: Ben Hutchings @ 2017-04-01 13:17 UTC (permalink / raw)
To: linux-kernel, stable
Cc: akpm, Arnd Bergmann, linux-mips, Ralf Baechle, Paul Burton
3.16.43-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Paul Burton <paul.burton@imgtec.com>
commit 33c771ba5c5d067f85a5a6c4b11047219b5b8f4e upstream.
The kernel depends upon MSA never being enabled when the FPU is not, a
condition which is currently violated in a few places (whilst saving
sigcontext, following mips_cpu_save). Catch all the problem cases by
disabling MSA in lose_fpu, after saving context if necessary.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7302/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
---
arch/mips/include/asm/fpu.h | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
--- a/arch/mips/include/asm/fpu.h
+++ b/arch/mips/include/asm/fpu.h
@@ -21,6 +21,7 @@
#include <asm/hazards.h>
#include <asm/processor.h>
#include <asm/current.h>
+#include <asm/msa.h>
#ifdef CONFIG_MIPS_MT_FPAFF
#include <asm/mips_mt.h>
@@ -141,13 +142,21 @@ static inline int own_fpu(int restore)
static inline void lose_fpu(int save)
{
preempt_disable();
- if (is_fpu_owner()) {
+ if (is_msa_enabled()) {
+ if (save) {
+ save_msa(current);
+ asm volatile("cfc1 %0, $31"
+ : "=r"(current->thread.fpu.fcr31));
+ }
+ disable_msa();
+ clear_thread_flag(TIF_USEDMSA);
+ } else if (is_fpu_owner()) {
if (save)
_save_fp(current);
- KSTK_STATUS(current) &= ~ST0_CU1;
- clear_thread_flag(TIF_USEDFPU);
__disable_fpu();
}
+ KSTK_STATUS(current) &= ~ST0_CU1;
+ clear_thread_flag(TIF_USEDFPU);
preempt_enable();
}
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 3.16 04/19] MIPS: preserve scalar FP CSR when switching vector context
[not found] <lsq.1491052670.319419763@decadent.org.uk>
` (3 preceding siblings ...)
2017-04-01 13:17 ` [PATCH 3.16 03/19] MIPS: save/restore MSACSR register on context switch Ben Hutchings
@ 2017-04-01 13:17 ` Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 07/19] MIPS: Fix build with binutils 2.24.51+ Ben Hutchings
5 siblings, 0 replies; 6+ messages in thread
From: Ben Hutchings @ 2017-04-01 13:17 UTC (permalink / raw)
To: linux-kernel, stable
Cc: akpm, Arnd Bergmann, linux-mips, Ralf Baechle, Paul Burton
3.16.43-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Paul Burton <paul.burton@imgtec.com>
commit b83406735a4ae0aff4b614664d6a64a0fd6b9917 upstream.
Switching the vector context implicitly saves & restores the state of
the aliased scalar FP data registers, however the scalar FP control
& status register is distinct from the MSA control & status register.
In order to allow scalar FP to function correctly in programs using
MSA, the scalar CSR needs to be saved & restored along with the MSA
vector context.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7301/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
---
arch/mips/kernel/r4k_switch.S | 4 +++-
arch/mips/kernel/traps.c | 5 +++++
2 files changed, 8 insertions(+), 1 deletion(-)
--- a/arch/mips/kernel/r4k_switch.S
+++ b/arch/mips/kernel/r4k_switch.S
@@ -64,8 +64,10 @@
/* Check whether we're saving scalar or vector context. */
bgtz a3, 1f
- /* Save 128b MSA vector context. */
+ /* Save 128b MSA vector context + scalar FP control & status. */
+ cfc1 t1, fcr31
msa_save_all a0
+ sw t1, THREAD_FCR31(a0)
b 2f
1: /* Save 32b/64b scalar FP context. */
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1159,6 +1159,11 @@ static int enable_restore_fp_context(int
/* We need to restore the vector context. */
restore_msa(current);
+
+ /* Restore the scalar FP control & status register */
+ if (!was_fpu_owner)
+ asm volatile("ctc1 %0, $31" : : "r"(current->thread.fpu.fcr31));
+
return 0;
}
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 3.16 13/19] MIPS: ralink: Cosmetic change to prom_init().
[not found] <lsq.1491052670.319419763@decadent.org.uk>
2017-04-01 13:17 ` [PATCH 3.16 05/19] MIPS: save/disable MSA in lose_fpu Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 06/19] MIPS: init upper 64b of vector registers when MSA is first used Ben Hutchings
@ 2017-04-01 13:17 ` Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 03/19] MIPS: save/restore MSACSR register on context switch Ben Hutchings
` (2 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: Ben Hutchings @ 2017-04-01 13:17 UTC (permalink / raw)
To: linux-kernel, stable
Cc: akpm, Arnd Bergmann, linux-mips, John Crispin, Ralf Baechle
3.16.43-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: John Crispin <john@phrozen.org>
commit 9c48568b3692f1a56cbf1935e4eea835e6b185b1 upstream.
Over the years the code has been changed various times leading to
argc/argv being defined in a different function to where we actually
use the variables. Clean this up by moving them to prom_init_cmdline().
Signed-off-by: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14902/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
---
arch/mips/ralink/prom.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/arch/mips/ralink/prom.c
+++ b/arch/mips/ralink/prom.c
@@ -24,8 +24,10 @@ const char *get_system_type(void)
return soc_info.sys_type;
}
-static __init void prom_init_cmdline(int argc, char **argv)
+static __init void prom_init_cmdline(void)
{
+ int argc;
+ char **argv;
int i;
pr_debug("prom: fw_arg0=%08x fw_arg1=%08x fw_arg2=%08x fw_arg3=%08x\n",
@@ -54,14 +56,11 @@ static __init void prom_init_cmdline(int
void __init prom_init(void)
{
- int argc;
- char **argv;
-
prom_soc_init(&soc_info);
pr_info("SoC Type: %s\n", get_system_type());
- prom_init_cmdline(argc, argv);
+ prom_init_cmdline();
}
void __init prom_free_prom_memory(void)
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 3.16 06/19] MIPS: init upper 64b of vector registers when MSA is first used
[not found] <lsq.1491052670.319419763@decadent.org.uk>
2017-04-01 13:17 ` [PATCH 3.16 05/19] MIPS: save/disable MSA in lose_fpu Ben Hutchings
@ 2017-04-01 13:17 ` Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 13/19] MIPS: ralink: Cosmetic change to prom_init() Ben Hutchings
` (3 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: Ben Hutchings @ 2017-04-01 13:17 UTC (permalink / raw)
To: linux-kernel, stable
Cc: akpm, Ralf Baechle, Paul Burton, linux-mips, Arnd Bergmann
3.16.43-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Paul Burton <paul.burton@imgtec.com>
commit c9017757c532d48bf43d6e7d3b7282443ad4207b upstream.
When a task first makes use of MSA we need to ensure that the upper
64b of the vector registers are set to some value such that no
information can be leaked to it from the previous task to use MSA
context on the CPU. The architecture formerly specified that these
bits would be cleared to 0 when a scalar FP instructions wrote to the
aliased FP registers, which would have implicitly handled this as the
kernel restored scalar FP context. However more recent versions of the
specification now state that the value of the bits in such cases is
unpredictable. Initialise them explictly to be sure, and set all the
bits to 1 rather than 0 for consistency with the least significant
64b.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7497/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
---
arch/mips/include/asm/asmmacro.h | 20 ++++++++++++++++++++
arch/mips/include/asm/msa.h | 1 +
arch/mips/kernel/r4k_switch.S | 5 +++++
arch/mips/kernel/traps.c | 39 ++++++++++++++++++++++++++++++---------
4 files changed, 56 insertions(+), 9 deletions(-)
--- a/arch/mips/include/asm/asmmacro.h
+++ b/arch/mips/include/asm/asmmacro.h
@@ -426,4 +426,24 @@
ld_d 31, THREAD_FPR31, \thread
.endm
+ .macro msa_init_upper wd
+#ifdef CONFIG_64BIT
+ insert_d \wd, 1
+#else
+ insert_w \wd, 2
+ insert_w \wd, 3
+#endif
+ .if 31-\wd
+ msa_init_upper (\wd+1)
+ .endif
+ .endm
+
+ .macro msa_init_all_upper
+ .set push
+ .set noat
+ not $1, zero
+ msa_init_upper 0
+ .set pop
+ .endm
+
#endif /* _ASM_ASMMACRO_H */
--- a/arch/mips/include/asm/msa.h
+++ b/arch/mips/include/asm/msa.h
@@ -14,6 +14,7 @@
extern void _save_msa(struct task_struct *);
extern void _restore_msa(struct task_struct *);
+extern void _init_msa_upper(void);
static inline void enable_msa(void)
{
--- a/arch/mips/kernel/r4k_switch.S
+++ b/arch/mips/kernel/r4k_switch.S
@@ -144,6 +144,11 @@ LEAF(_restore_msa)
jr ra
END(_restore_msa)
+LEAF(_init_msa_upper)
+ msa_init_all_upper
+ jr ra
+ END(_init_msa_upper)
+
#endif
/*
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1094,13 +1094,15 @@ static int default_cu2_call(struct notif
static int enable_restore_fp_context(int msa)
{
- int err, was_fpu_owner;
+ int err, was_fpu_owner, prior_msa;
if (!used_math()) {
/* First time FP context user. */
err = init_fpu();
- if (msa && !err)
+ if (msa && !err) {
enable_msa();
+ _init_msa_upper();
+ }
if (!err)
set_used_math();
return err;
@@ -1152,18 +1154,37 @@ static int enable_restore_fp_context(int
/*
* If this is the first time that the task is using MSA and it has
* previously used scalar FP in this time slice then we already nave
- * FP context which we shouldn't clobber.
+ * FP context which we shouldn't clobber. We do however need to clear
+ * the upper 64b of each vector register so that this task has no
+ * opportunity to see data left behind by another.
*/
- if (!test_and_set_thread_flag(TIF_MSA_CTX_LIVE) && was_fpu_owner)
+ prior_msa = test_and_set_thread_flag(TIF_MSA_CTX_LIVE);
+ if (!prior_msa && was_fpu_owner) {
+ _init_msa_upper();
return 0;
+ }
- /* We need to restore the vector context. */
- restore_msa(current);
-
- /* Restore the scalar FP control & status register */
- if (!was_fpu_owner)
- asm volatile("ctc1 %0, $31" : : "r"(current->thread.fpu.fcr31));
-
+ if (!prior_msa) {
+ /*
+ * Restore the least significant 64b of each vector register
+ * from the existing scalar FP context.
+ */
+ _restore_fp(current);
+
+ /*
+ * The task has not formerly used MSA, so clear the upper 64b
+ * of each vector register such that it cannot see data left
+ * behind by another task.
+ */
+ _init_msa_upper();
+ } else {
+ /* We need to restore the vector context. */
+ restore_msa(current);
+
+ /* Restore the scalar FP control & status register */
+ if (!was_fpu_owner)
+ asm volatile("ctc1 %0, $31" : : "r"(current->thread.fpu.fcr31));
+ }
return 0;
}
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 3.16 03/19] MIPS: save/restore MSACSR register on context switch
[not found] <lsq.1491052670.319419763@decadent.org.uk>
` (2 preceding siblings ...)
2017-04-01 13:17 ` [PATCH 3.16 13/19] MIPS: ralink: Cosmetic change to prom_init() Ben Hutchings
@ 2017-04-01 13:17 ` Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 04/19] MIPS: preserve scalar FP CSR when switching vector context Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 07/19] MIPS: Fix build with binutils 2.24.51+ Ben Hutchings
5 siblings, 0 replies; 6+ messages in thread
From: Ben Hutchings @ 2017-04-01 13:17 UTC (permalink / raw)
To: linux-kernel, stable
Cc: akpm, Ralf Baechle, Paul Burton, Arnd Bergmann, linux-mips
3.16.43-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Paul Burton <paul.burton@imgtec.com>
commit f7a46fa7bb0047d3e226702a0c4b786862fe6843 upstream.
I added a field for the MSACSR register in struct mips_fpu_struct, but
never actually made use of it... This is a clear bug. Save and restore
the MSACSR register along with the vector registers.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7300/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
---
arch/mips/include/asm/asmmacro.h | 11 +++++++++++
arch/mips/kernel/asm-offsets.c | 1 +
2 files changed, 12 insertions(+)
--- a/arch/mips/include/asm/asmmacro.h
+++ b/arch/mips/include/asm/asmmacro.h
@@ -10,6 +10,7 @@
#include <asm/hazards.h>
#include <asm/asm-offsets.h>
+#include <asm/msa.h>
#ifdef CONFIG_32BIT
#include <asm/asmmacro-32.h>
@@ -378,9 +379,19 @@
st_d 29, THREAD_FPR29, \thread
st_d 30, THREAD_FPR30, \thread
st_d 31, THREAD_FPR31, \thread
+ .set push
+ .set noat
+ cfcmsa $1, MSA_CSR
+ sw $1, THREAD_MSA_CSR(\thread)
+ .set pop
.endm
.macro msa_restore_all thread
+ .set push
+ .set noat
+ lw $1, THREAD_MSA_CSR(\thread)
+ ctcmsa MSA_CSR, $1
+ .set pop
ld_d 0, THREAD_FPR0, \thread
ld_d 1, THREAD_FPR1, \thread
ld_d 2, THREAD_FPR2, \thread
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -234,6 +234,7 @@ void output_thread_fpu_defines(void)
thread.fpu.fpr[31].val64[FPR_IDX(64, 0)]);
OFFSET(THREAD_FCR31, task_struct, thread.fpu.fcr31);
+ OFFSET(THREAD_MSA_CSR, task_struct, thread.fpu.msacsr);
BLANK();
}
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 3.16 07/19] MIPS: Fix build with binutils 2.24.51+
[not found] <lsq.1491052670.319419763@decadent.org.uk>
` (4 preceding siblings ...)
2017-04-01 13:17 ` [PATCH 3.16 04/19] MIPS: preserve scalar FP CSR when switching vector context Ben Hutchings
@ 2017-04-01 13:17 ` Ben Hutchings
5 siblings, 0 replies; 6+ messages in thread
From: Ben Hutchings @ 2017-04-01 13:17 UTC (permalink / raw)
To: linux-kernel, stable
Cc: akpm, Arnd Bergmann, Manuel Lauss, Markos Chandras, Ralf Baechle,
Matthew Fortune, Maciej W. Rozycki, Linux-MIPS
3.16.43-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Manuel Lauss <manuel.lauss@gmail.com>
commit 842dfc11ea9a21f9825167c8a4f2834b205b0a79 upstream.
Starting with version 2.24.51.20140728 MIPS binutils complain loudly
about mixing soft-float and hard-float object files, leading to this
build failure since GCC is invoked with "-msoft-float" on MIPS:
{standard input}: Warning: .gnu_attribute 4,3 requires `softfloat'
LD arch/mips/alchemy/common/built-in.o
mipsel-softfloat-linux-gnu-ld: Warning: arch/mips/alchemy/common/built-in.o
uses -msoft-float (set by arch/mips/alchemy/common/prom.o),
arch/mips/alchemy/common/sleeper.o uses -mhard-float
To fix this, we detect if GAS is new enough to support "-msoft-float" command
option, and if it does, we can let GCC pass it to GAS; but then we also need
to sprinkle the files which make use of floating point registers with the
necessary ".set hardfloat" directives.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Cc: Markos Chandras <Markos.Chandras@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8355/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
---
arch/mips/Makefile | 9 +++++++++
arch/mips/include/asm/asmmacro-32.h | 6 ++++++
arch/mips/include/asm/asmmacro.h | 18 ++++++++++++++++++
arch/mips/include/asm/fpregdef.h | 14 ++++++++++++++
arch/mips/include/asm/fpu.h | 4 ++--
arch/mips/include/asm/mipsregs.h | 11 ++++++++++-
arch/mips/kernel/branch.c | 8 ++------
arch/mips/kernel/genex.S | 1 +
arch/mips/kernel/r2300_fpu.S | 6 ++++++
arch/mips/kernel/r2300_switch.S | 5 +++++
arch/mips/kernel/r4k_fpu.S | 27 +++++++++++++++++++++++++--
arch/mips/kernel/r4k_switch.S | 15 ++++++++++++++-
arch/mips/kernel/r6000_fpu.S | 5 +++++
arch/mips/math-emu/cp1emu.c | 6 +-----
14 files changed, 118 insertions(+), 17 deletions(-)
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -93,6 +93,15 @@ LDFLAGS_vmlinux += -G 0 -static -n -no
KBUILD_AFLAGS_MODULE += -mlong-calls
KBUILD_CFLAGS_MODULE += -mlong-calls
+#
+# pass -msoft-float to GAS if it supports it. However on newer binutils
+# (specifically newer than 2.24.51.20140728) we then also need to explicitly
+# set ".set hardfloat" in all files which manipulate floating point registers.
+#
+ifneq ($(call as-option,-Wa$(comma)-msoft-float,),)
+ cflags-y += -DGAS_HAS_SET_HARDFLOAT -Wa,-msoft-float
+endif
+
cflags-y += -ffreestanding
#
--- a/arch/mips/include/asm/asmmacro-32.h
+++ b/arch/mips/include/asm/asmmacro-32.h
@@ -13,6 +13,8 @@
#include <asm/mipsregs.h>
.macro fpu_save_single thread tmp=t0
+ .set push
+ SET_HARDFLOAT
cfc1 \tmp, fcr31
swc1 $f0, THREAD_FPR0_LS64(\thread)
swc1 $f1, THREAD_FPR1_LS64(\thread)
@@ -47,9 +49,12 @@
swc1 $f30, THREAD_FPR30_LS64(\thread)
swc1 $f31, THREAD_FPR31_LS64(\thread)
sw \tmp, THREAD_FCR31(\thread)
+ .set pop
.endm
.macro fpu_restore_single thread tmp=t0
+ .set push
+ SET_HARDFLOAT
lw \tmp, THREAD_FCR31(\thread)
lwc1 $f0, THREAD_FPR0_LS64(\thread)
lwc1 $f1, THREAD_FPR1_LS64(\thread)
@@ -84,6 +89,7 @@
lwc1 $f30, THREAD_FPR30_LS64(\thread)
lwc1 $f31, THREAD_FPR31_LS64(\thread)
ctc1 \tmp, fcr31
+ .set pop
.endm
.macro cpu_save_nonscratch thread
--- a/arch/mips/include/asm/asmmacro.h
+++ b/arch/mips/include/asm/asmmacro.h
@@ -57,6 +57,8 @@
#endif /* CONFIG_CPU_MIPSR2 */
.macro fpu_save_16even thread tmp=t0
+ .set push
+ SET_HARDFLOAT
cfc1 \tmp, fcr31
sdc1 $f0, THREAD_FPR0_LS64(\thread)
sdc1 $f2, THREAD_FPR2_LS64(\thread)
@@ -75,11 +77,13 @@
sdc1 $f28, THREAD_FPR28_LS64(\thread)
sdc1 $f30, THREAD_FPR30_LS64(\thread)
sw \tmp, THREAD_FCR31(\thread)
+ .set pop
.endm
.macro fpu_save_16odd thread
.set push
.set mips64r2
+ SET_HARDFLOAT
sdc1 $f1, THREAD_FPR1_LS64(\thread)
sdc1 $f3, THREAD_FPR3_LS64(\thread)
sdc1 $f5, THREAD_FPR5_LS64(\thread)
@@ -110,6 +114,8 @@
.endm
.macro fpu_restore_16even thread tmp=t0
+ .set push
+ SET_HARDFLOAT
lw \tmp, THREAD_FCR31(\thread)
ldc1 $f0, THREAD_FPR0_LS64(\thread)
ldc1 $f2, THREAD_FPR2_LS64(\thread)
@@ -133,6 +139,7 @@
.macro fpu_restore_16odd thread
.set push
.set mips64r2
+ SET_HARDFLOAT
ldc1 $f1, THREAD_FPR1_LS64(\thread)
ldc1 $f3, THREAD_FPR3_LS64(\thread)
ldc1 $f5, THREAD_FPR5_LS64(\thread)
@@ -277,6 +284,7 @@
.macro cfcmsa rd, cs
.set push
.set noat
+ SET_HARDFLOAT
.insn
.word CFC_MSA_INSN | (\cs << 11)
move \rd, $1
@@ -286,6 +294,7 @@
.macro ctcmsa cd, rs
.set push
.set noat
+ SET_HARDFLOAT
move $1, \rs
.word CTC_MSA_INSN | (\cd << 6)
.set pop
@@ -294,6 +303,7 @@
.macro ld_d wd, off, base
.set push
.set noat
+ SET_HARDFLOAT
addu $1, \base, \off
.word LDD_MSA_INSN | (\wd << 6)
.set pop
@@ -302,6 +312,7 @@
.macro st_d wd, off, base
.set push
.set noat
+ SET_HARDFLOAT
addu $1, \base, \off
.word STD_MSA_INSN | (\wd << 6)
.set pop
@@ -310,6 +321,7 @@
.macro copy_u_w rd, ws, n
.set push
.set noat
+ SET_HARDFLOAT
.insn
.word COPY_UW_MSA_INSN | (\n << 16) | (\ws << 11)
/* move triggers an assembler bug... */
@@ -320,6 +332,7 @@
.macro copy_u_d rd, ws, n
.set push
.set noat
+ SET_HARDFLOAT
.insn
.word COPY_UD_MSA_INSN | (\n << 16) | (\ws << 11)
/* move triggers an assembler bug... */
@@ -330,6 +343,7 @@
.macro insert_w wd, n, rs
.set push
.set noat
+ SET_HARDFLOAT
/* move triggers an assembler bug... */
or $1, \rs, zero
.word INSERT_W_MSA_INSN | (\n << 16) | (\wd << 6)
@@ -339,6 +353,7 @@
.macro insert_d wd, n, rs
.set push
.set noat
+ SET_HARDFLOAT
/* move triggers an assembler bug... */
or $1, \rs, zero
.word INSERT_D_MSA_INSN | (\n << 16) | (\wd << 6)
@@ -381,6 +396,7 @@
st_d 31, THREAD_FPR31, \thread
.set push
.set noat
+ SET_HARDFLOAT
cfcmsa $1, MSA_CSR
sw $1, THREAD_MSA_CSR(\thread)
.set pop
@@ -389,6 +405,7 @@
.macro msa_restore_all thread
.set push
.set noat
+ SET_HARDFLOAT
lw $1, THREAD_MSA_CSR(\thread)
ctcmsa MSA_CSR, $1
.set pop
@@ -441,6 +458,7 @@
.macro msa_init_all_upper
.set push
.set noat
+ SET_HARDFLOAT
not $1, zero
msa_init_upper 0
.set pop
--- a/arch/mips/include/asm/fpregdef.h
+++ b/arch/mips/include/asm/fpregdef.h
@@ -14,6 +14,20 @@
#include <asm/sgidefs.h>
+/*
+ * starting with binutils 2.24.51.20140729, MIPS binutils warn about mixing
+ * hardfloat and softfloat object files. The kernel build uses soft-float by
+ * default, so we also need to pass -msoft-float along to GAS if it supports it.
+ * But this in turn causes assembler errors in files which access hardfloat
+ * registers. We detect if GAS supports "-msoft-float" in the Makefile and
+ * explicitly put ".set hardfloat" where floating point registers are touched.
+ */
+#ifdef GAS_HAS_SET_HARDFLOAT
+#define SET_HARDFLOAT .set hardfloat
+#else
+#define SET_HARDFLOAT
+#endif
+
#if _MIPS_SIM == _MIPS_SIM_ABI32
/*
--- a/arch/mips/include/asm/fpu.h
+++ b/arch/mips/include/asm/fpu.h
@@ -145,8 +145,8 @@ static inline void lose_fpu(int save)
if (is_msa_enabled()) {
if (save) {
save_msa(current);
- asm volatile("cfc1 %0, $31"
- : "=r"(current->thread.fpu.fcr31));
+ current->thread.fpu.fcr31 =
+ read_32bit_cp1_register(CP1_STATUS);
}
disable_msa();
clear_thread_flag(TIF_USEDMSA);
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -1270,7 +1270,7 @@ do { \
/*
* Macros to access the floating point coprocessor control registers
*/
-#define read_32bit_cp1_register(source) \
+#define _read_32bit_cp1_register(source, gas_hardfloat) \
({ \
int __res; \
\
@@ -1280,12 +1280,21 @@ do { \
" # gas fails to assemble cfc1 for some archs, \n" \
" # like Octeon. \n" \
" .set mips1 \n" \
+ " "STR(gas_hardfloat)" \n" \
" cfc1 %0,"STR(source)" \n" \
" .set pop \n" \
: "=r" (__res)); \
__res; \
})
+#ifdef GAS_HAS_SET_HARDFLOAT
+#define read_32bit_cp1_register(source) \
+ _read_32bit_cp1_register(source, .set hardfloat)
+#else
+#define read_32bit_cp1_register(source) \
+ _read_32bit_cp1_register(source, )
+#endif
+
#ifdef HAVE_AS_DSP
#define rddsp(mask) \
({ \
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -144,7 +144,7 @@ int __mm_isBranchInstr(struct pt_regs *r
case mm_bc1t_op:
preempt_disable();
if (is_fpu_owner())
- asm volatile("cfc1\t%0,$31" : "=r" (fcr31));
+ fcr31 = read_32bit_cp1_register(CP1_STATUS);
else
fcr31 = current->thread.fpu.fcr31;
preempt_enable();
@@ -562,11 +562,7 @@ int __compute_return_epc_for_insn(struct
case cop1_op:
preempt_disable();
if (is_fpu_owner())
- asm volatile(
- ".set push\n"
- "\t.set mips1\n"
- "\tcfc1\t%0,$31\n"
- "\t.set pop" : "=r" (fcr31));
+ fcr31 = read_32bit_cp1_register(CP1_STATUS);
else
fcr31 = current->thread.fpu.fcr31;
preempt_enable();
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -358,6 +358,7 @@ NESTED(nmi_handler, PT_SIZE, sp)
.set push
/* gas fails to assemble cfc1 for some archs (octeon).*/ \
.set mips1
+ SET_HARDFLOAT
cfc1 a1, fcr31
li a2, ~(0x3f << 12)
and a2, a1
--- a/arch/mips/kernel/r2300_fpu.S
+++ b/arch/mips/kernel/r2300_fpu.S
@@ -28,6 +28,8 @@
.set mips1
/* Save floating point context */
LEAF(_save_fp_context)
+ .set push
+ SET_HARDFLOAT
li v0, 0 # assume success
cfc1 t1,fcr31
EX(swc1 $f0,(SC_FPREGS+0)(a0))
@@ -65,6 +67,7 @@ LEAF(_save_fp_context)
EX(sw t1,(SC_FPC_CSR)(a0))
cfc1 t0,$0 # implementation/version
jr ra
+ .set pop
.set nomacro
EX(sw t0,(SC_FPC_EIR)(a0))
.set macro
@@ -80,6 +83,8 @@ LEAF(_save_fp_context)
* stack frame which might have been changed by the user.
*/
LEAF(_restore_fp_context)
+ .set push
+ SET_HARDFLOAT
li v0, 0 # assume success
EX(lw t0,(SC_FPC_CSR)(a0))
EX(lwc1 $f0,(SC_FPREGS+0)(a0))
@@ -116,6 +121,7 @@ LEAF(_restore_fp_context)
EX(lwc1 $f31,(SC_FPREGS+248)(a0))
jr ra
ctc1 t0,fcr31
+ .set pop
END(_restore_fp_context)
.set reorder
--- a/arch/mips/kernel/r2300_switch.S
+++ b/arch/mips/kernel/r2300_switch.S
@@ -120,6 +120,9 @@ LEAF(_restore_fp)
#define FPU_DEFAULT 0x00000000
+ .set push
+ SET_HARDFLOAT
+
LEAF(_init_fpu)
mfc0 t0, CP0_STATUS
li t1, ST0_CU1
@@ -165,3 +168,5 @@ LEAF(_init_fpu)
mtc1 t0, $f31
jr ra
END(_init_fpu)
+
+ .set pop
--- a/arch/mips/kernel/r4k_fpu.S
+++ b/arch/mips/kernel/r4k_fpu.S
@@ -19,8 +19,12 @@
#include <asm/asm-offsets.h>
#include <asm/regdef.h>
+/* preprocessor replaces the fp in ".set fp=64" with $30 otherwise */
+#undef fp
+
.macro EX insn, reg, src
.set push
+ SET_HARDFLOAT
.set nomacro
.ex\@: \insn \reg, \src
.set pop
@@ -33,12 +37,17 @@
.set arch=r4000
LEAF(_save_fp_context)
+ .set push
+ SET_HARDFLOAT
cfc1 t1, fcr31
+ .set pop
#if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPS32_R2)
.set push
+ SET_HARDFLOAT
#ifdef CONFIG_CPU_MIPS32_R2
- .set mips64r2
+ .set mips32r2
+ .set fp=64
mfc0 t0, CP0_STATUS
sll t0, t0, 5
bgez t0, 1f # skip storing odd if FR=0
@@ -64,6 +73,8 @@ LEAF(_save_fp_context)
1: .set pop
#endif
+ .set push
+ SET_HARDFLOAT
/* Store the 16 even double precision registers */
EX sdc1 $f0, SC_FPREGS+0(a0)
EX sdc1 $f2, SC_FPREGS+16(a0)
@@ -84,11 +95,14 @@ LEAF(_save_fp_context)
EX sw t1, SC_FPC_CSR(a0)
jr ra
li v0, 0 # success
+ .set pop
END(_save_fp_context)
#ifdef CONFIG_MIPS32_COMPAT
/* Save 32-bit process floating point context */
LEAF(_save_fp_context32)
+ .set push
+ SET_HARDFLOAT
cfc1 t1, fcr31
mfc0 t0, CP0_STATUS
@@ -134,6 +148,7 @@ LEAF(_save_fp_context32)
EX sw t1, SC32_FPC_CSR(a0)
cfc1 t0, $0 # implementation/version
EX sw t0, SC32_FPC_EIR(a0)
+ .set pop
jr ra
li v0, 0 # success
@@ -150,8 +165,10 @@ LEAF(_restore_fp_context)
#if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPS32_R2)
.set push
+ SET_HARDFLOAT
#ifdef CONFIG_CPU_MIPS32_R2
- .set mips64r2
+ .set mips32r2
+ .set fp=64
mfc0 t0, CP0_STATUS
sll t0, t0, 5
bgez t0, 1f # skip loading odd if FR=0
@@ -175,6 +192,8 @@ LEAF(_restore_fp_context)
EX ldc1 $f31, SC_FPREGS+248(a0)
1: .set pop
#endif
+ .set push
+ SET_HARDFLOAT
EX ldc1 $f0, SC_FPREGS+0(a0)
EX ldc1 $f2, SC_FPREGS+16(a0)
EX ldc1 $f4, SC_FPREGS+32(a0)
@@ -192,6 +211,7 @@ LEAF(_restore_fp_context)
EX ldc1 $f28, SC_FPREGS+224(a0)
EX ldc1 $f30, SC_FPREGS+240(a0)
ctc1 t1, fcr31
+ .set pop
jr ra
li v0, 0 # success
END(_restore_fp_context)
@@ -199,6 +219,8 @@ LEAF(_restore_fp_context)
#ifdef CONFIG_MIPS32_COMPAT
LEAF(_restore_fp_context32)
/* Restore an o32 sigcontext. */
+ .set push
+ SET_HARDFLOAT
EX lw t1, SC32_FPC_CSR(a0)
mfc0 t0, CP0_STATUS
@@ -242,6 +264,7 @@ LEAF(_restore_fp_context32)
ctc1 t1, fcr31
jr ra
li v0, 0 # success
+ .set pop
END(_restore_fp_context32)
#endif
--- a/arch/mips/kernel/r4k_switch.S
+++ b/arch/mips/kernel/r4k_switch.S
@@ -22,6 +22,9 @@
#include <asm/asmmacro.h>
+/* preprocessor replaces the fp in ".set fp=64" with $30 otherwise */
+#undef fp
+
/*
* Offset to the current process status flags, the first 32 bytes of the
* stack are not used.
@@ -65,8 +68,12 @@
bgtz a3, 1f
/* Save 128b MSA vector context + scalar FP control & status. */
+ .set push
+ SET_HARDFLOAT
cfc1 t1, fcr31
msa_save_all a0
+ .set pop /* SET_HARDFLOAT */
+
sw t1, THREAD_FCR31(a0)
b 2f
@@ -161,6 +168,9 @@ LEAF(_init_msa_upper)
#define FPU_DEFAULT 0x00000000
+ .set push
+ SET_HARDFLOAT
+
LEAF(_init_fpu)
mfc0 t0, CP0_STATUS
li t1, ST0_CU1
@@ -232,7 +242,8 @@ LEAF(_init_fpu)
#ifdef CONFIG_CPU_MIPS32_R2
.set push
- .set mips64r2
+ .set mips32r2
+ .set fp=64
sll t0, t0, 5 # is Status.FR set?
bgez t0, 1f # no: skip setting upper 32b
@@ -291,3 +302,5 @@ LEAF(_init_fpu)
#endif
jr ra
END(_init_fpu)
+
+ .set pop /* SET_HARDFLOAT */
--- a/arch/mips/kernel/r6000_fpu.S
+++ b/arch/mips/kernel/r6000_fpu.S
@@ -18,6 +18,9 @@
.set noreorder
.set mips2
+ .set push
+ SET_HARDFLOAT
+
/* Save floating point context */
LEAF(_save_fp_context)
mfc0 t0,CP0_STATUS
@@ -85,3 +88,5 @@
1: jr ra
nop
END(_restore_fp_context)
+
+ .set pop /* SET_HARDFLOAT */
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -586,11 +586,7 @@ static int isBranchInstr(struct pt_regs
if (insn.i_format.rs == bc_op) {
preempt_disable();
if (is_fpu_owner())
- asm volatile(
- ".set push\n"
- "\t.set mips1\n"
- "\tcfc1\t%0,$31\n"
- "\t.set pop" : "=r" (fcr31));
+ fcr31 = read_32bit_cp1_register(CP1_STATUS);
else
fcr31 = current->thread.fpu.fcr31;
preempt_enable();
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2017-04-01 13:25 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <lsq.1491052670.319419763@decadent.org.uk>
2017-04-01 13:17 ` [PATCH 3.16 05/19] MIPS: save/disable MSA in lose_fpu Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 06/19] MIPS: init upper 64b of vector registers when MSA is first used Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 13/19] MIPS: ralink: Cosmetic change to prom_init() Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 03/19] MIPS: save/restore MSACSR register on context switch Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 04/19] MIPS: preserve scalar FP CSR when switching vector context Ben Hutchings
2017-04-01 13:17 ` [PATCH 3.16 07/19] MIPS: Fix build with binutils 2.24.51+ Ben Hutchings
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).