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MIPS: Fix build with binutils 2.24.51+ 

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>
This commit is contained in:
Manuel Lauss 2014-11-07 14:13:54 +01:00 committed by Ralf Baechle
parent 491a48aa52
commit 842dfc11ea
14 changed files with 118 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/mips/Makefile
View File

@ -93,6 +93,15 @@ LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
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
#

6
arch/mips/include/asm/asmmacro-32.h
View File

@ -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

18
arch/mips/include/asm/asmmacro.h
View File

@ -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
add $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
add $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

14
arch/mips/include/asm/fpregdef.h
View File

@ -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
/*

4
arch/mips/include/asm/fpu.h
View File

@ -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);

11
arch/mips/include/asm/mipsregs.h
View File

@ -1324,7 +1324,7 @@ 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; \
\
@ -1334,12 +1334,21 @@ 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) \
({ \

8
arch/mips/kernel/branch.c
View File

@ -144,7 +144,7 @@ int __mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
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 pt_regs *regs,
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();

1
arch/mips/kernel/genex.S
View File

@ -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

6
arch/mips/kernel/r2300_fpu.S
View File

@ -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

5
arch/mips/kernel/r2300_switch.S
View File

@ -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

27
arch/mips/kernel/r4k_fpu.S
View File

@ -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

15
arch/mips/kernel/r4k_switch.S
View File

@ -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 */

5
arch/mips/kernel/r6000_fpu.S
View File

@ -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 */

6
arch/mips/math-emu/cp1emu.c
View File

@ -584,11 +584,7 @@ static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
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();