mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-29 05:55:02 +08:00
842dfc11ea
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>
307 lines
6.1 KiB
ArmAsm
307 lines
6.1 KiB
ArmAsm
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1994, 1995, 1996, 1998, 1999, 2002, 2003 Ralf Baechle
|
|
* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
|
|
* Copyright (C) 1994, 1995, 1996, by Andreas Busse
|
|
* Copyright (C) 1999 Silicon Graphics, Inc.
|
|
* Copyright (C) 2000 MIPS Technologies, Inc.
|
|
* written by Carsten Langgaard, carstenl@mips.com
|
|
*/
|
|
#include <asm/asm.h>
|
|
#include <asm/cachectl.h>
|
|
#include <asm/fpregdef.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/pgtable-bits.h>
|
|
#include <asm/regdef.h>
|
|
#include <asm/stackframe.h>
|
|
#include <asm/thread_info.h>
|
|
|
|
#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.
|
|
*/
|
|
#define ST_OFF (_THREAD_SIZE - 32 - PT_SIZE + PT_STATUS)
|
|
|
|
#ifndef USE_ALTERNATE_RESUME_IMPL
|
|
/*
|
|
* task_struct *resume(task_struct *prev, task_struct *next,
|
|
* struct thread_info *next_ti, s32 fp_save)
|
|
*/
|
|
.align 5
|
|
LEAF(resume)
|
|
mfc0 t1, CP0_STATUS
|
|
LONG_S t1, THREAD_STATUS(a0)
|
|
cpu_save_nonscratch a0
|
|
LONG_S ra, THREAD_REG31(a0)
|
|
|
|
/*
|
|
* Check whether we need to save any FP context. FP context is saved
|
|
* iff the process has used the context with the scalar FPU or the MSA
|
|
* ASE in the current time slice, as indicated by _TIF_USEDFPU and
|
|
* _TIF_USEDMSA respectively. switch_to will have set fp_save
|
|
* accordingly to an FP_SAVE_ enum value.
|
|
*/
|
|
beqz a3, 2f
|
|
|
|
/*
|
|
* We do. Clear the saved CU1 bit for prev, such that next time it is
|
|
* scheduled it will start in userland with the FPU disabled. If the
|
|
* task uses the FPU then it will be enabled again via the do_cpu trap.
|
|
* This allows us to lazily restore the FP context.
|
|
*/
|
|
PTR_L t3, TASK_THREAD_INFO(a0)
|
|
LONG_L t0, ST_OFF(t3)
|
|
li t1, ~ST0_CU1
|
|
and t0, t0, t1
|
|
LONG_S t0, ST_OFF(t3)
|
|
|
|
/* Check whether we're saving scalar or vector context. */
|
|
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
|
|
|
|
1: /* Save 32b/64b scalar FP context. */
|
|
fpu_save_double a0 t0 t1 # c0_status passed in t0
|
|
# clobbers t1
|
|
2:
|
|
|
|
#if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
|
|
PTR_LA t8, __stack_chk_guard
|
|
LONG_L t9, TASK_STACK_CANARY(a1)
|
|
LONG_S t9, 0(t8)
|
|
#endif
|
|
|
|
/*
|
|
* The order of restoring the registers takes care of the race
|
|
* updating $28, $29 and kernelsp without disabling ints.
|
|
*/
|
|
move $28, a2
|
|
cpu_restore_nonscratch a1
|
|
|
|
PTR_ADDU t0, $28, _THREAD_SIZE - 32
|
|
set_saved_sp t0, t1, t2
|
|
mfc0 t1, CP0_STATUS /* Do we really need this? */
|
|
li a3, 0xff01
|
|
and t1, a3
|
|
LONG_L a2, THREAD_STATUS(a1)
|
|
nor a3, $0, a3
|
|
and a2, a3
|
|
or a2, t1
|
|
mtc0 a2, CP0_STATUS
|
|
move v0, a0
|
|
jr ra
|
|
END(resume)
|
|
|
|
#endif /* USE_ALTERNATE_RESUME_IMPL */
|
|
|
|
/*
|
|
* Save a thread's fp context.
|
|
*/
|
|
LEAF(_save_fp)
|
|
#if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPS32_R2)
|
|
mfc0 t0, CP0_STATUS
|
|
#endif
|
|
fpu_save_double a0 t0 t1 # clobbers t1
|
|
jr ra
|
|
END(_save_fp)
|
|
|
|
/*
|
|
* Restore a thread's fp context.
|
|
*/
|
|
LEAF(_restore_fp)
|
|
#if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPS32_R2)
|
|
mfc0 t0, CP0_STATUS
|
|
#endif
|
|
fpu_restore_double a0 t0 t1 # clobbers t1
|
|
jr ra
|
|
END(_restore_fp)
|
|
|
|
#ifdef CONFIG_CPU_HAS_MSA
|
|
|
|
/*
|
|
* Save a thread's MSA vector context.
|
|
*/
|
|
LEAF(_save_msa)
|
|
msa_save_all a0
|
|
jr ra
|
|
END(_save_msa)
|
|
|
|
/*
|
|
* Restore a thread's MSA vector context.
|
|
*/
|
|
LEAF(_restore_msa)
|
|
msa_restore_all a0
|
|
jr ra
|
|
END(_restore_msa)
|
|
|
|
LEAF(_init_msa_upper)
|
|
msa_init_all_upper
|
|
jr ra
|
|
END(_init_msa_upper)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Load the FPU with signalling NANS. This bit pattern we're using has
|
|
* the property that no matter whether considered as single or as double
|
|
* precision represents signaling NANS.
|
|
*
|
|
* We initialize fcr31 to rounding to nearest, no exceptions.
|
|
*/
|
|
|
|
#define FPU_DEFAULT 0x00000000
|
|
|
|
.set push
|
|
SET_HARDFLOAT
|
|
|
|
LEAF(_init_fpu)
|
|
mfc0 t0, CP0_STATUS
|
|
li t1, ST0_CU1
|
|
or t0, t1
|
|
mtc0 t0, CP0_STATUS
|
|
enable_fpu_hazard
|
|
|
|
li t1, FPU_DEFAULT
|
|
ctc1 t1, fcr31
|
|
|
|
li t1, -1 # SNaN
|
|
|
|
#ifdef CONFIG_64BIT
|
|
sll t0, t0, 5
|
|
bgez t0, 1f # 16 / 32 register mode?
|
|
|
|
dmtc1 t1, $f1
|
|
dmtc1 t1, $f3
|
|
dmtc1 t1, $f5
|
|
dmtc1 t1, $f7
|
|
dmtc1 t1, $f9
|
|
dmtc1 t1, $f11
|
|
dmtc1 t1, $f13
|
|
dmtc1 t1, $f15
|
|
dmtc1 t1, $f17
|
|
dmtc1 t1, $f19
|
|
dmtc1 t1, $f21
|
|
dmtc1 t1, $f23
|
|
dmtc1 t1, $f25
|
|
dmtc1 t1, $f27
|
|
dmtc1 t1, $f29
|
|
dmtc1 t1, $f31
|
|
1:
|
|
#endif
|
|
|
|
#ifdef CONFIG_CPU_MIPS32
|
|
mtc1 t1, $f0
|
|
mtc1 t1, $f1
|
|
mtc1 t1, $f2
|
|
mtc1 t1, $f3
|
|
mtc1 t1, $f4
|
|
mtc1 t1, $f5
|
|
mtc1 t1, $f6
|
|
mtc1 t1, $f7
|
|
mtc1 t1, $f8
|
|
mtc1 t1, $f9
|
|
mtc1 t1, $f10
|
|
mtc1 t1, $f11
|
|
mtc1 t1, $f12
|
|
mtc1 t1, $f13
|
|
mtc1 t1, $f14
|
|
mtc1 t1, $f15
|
|
mtc1 t1, $f16
|
|
mtc1 t1, $f17
|
|
mtc1 t1, $f18
|
|
mtc1 t1, $f19
|
|
mtc1 t1, $f20
|
|
mtc1 t1, $f21
|
|
mtc1 t1, $f22
|
|
mtc1 t1, $f23
|
|
mtc1 t1, $f24
|
|
mtc1 t1, $f25
|
|
mtc1 t1, $f26
|
|
mtc1 t1, $f27
|
|
mtc1 t1, $f28
|
|
mtc1 t1, $f29
|
|
mtc1 t1, $f30
|
|
mtc1 t1, $f31
|
|
|
|
#ifdef CONFIG_CPU_MIPS32_R2
|
|
.set push
|
|
.set mips32r2
|
|
.set fp=64
|
|
sll t0, t0, 5 # is Status.FR set?
|
|
bgez t0, 1f # no: skip setting upper 32b
|
|
|
|
mthc1 t1, $f0
|
|
mthc1 t1, $f1
|
|
mthc1 t1, $f2
|
|
mthc1 t1, $f3
|
|
mthc1 t1, $f4
|
|
mthc1 t1, $f5
|
|
mthc1 t1, $f6
|
|
mthc1 t1, $f7
|
|
mthc1 t1, $f8
|
|
mthc1 t1, $f9
|
|
mthc1 t1, $f10
|
|
mthc1 t1, $f11
|
|
mthc1 t1, $f12
|
|
mthc1 t1, $f13
|
|
mthc1 t1, $f14
|
|
mthc1 t1, $f15
|
|
mthc1 t1, $f16
|
|
mthc1 t1, $f17
|
|
mthc1 t1, $f18
|
|
mthc1 t1, $f19
|
|
mthc1 t1, $f20
|
|
mthc1 t1, $f21
|
|
mthc1 t1, $f22
|
|
mthc1 t1, $f23
|
|
mthc1 t1, $f24
|
|
mthc1 t1, $f25
|
|
mthc1 t1, $f26
|
|
mthc1 t1, $f27
|
|
mthc1 t1, $f28
|
|
mthc1 t1, $f29
|
|
mthc1 t1, $f30
|
|
mthc1 t1, $f31
|
|
1: .set pop
|
|
#endif /* CONFIG_CPU_MIPS32_R2 */
|
|
#else
|
|
.set arch=r4000
|
|
dmtc1 t1, $f0
|
|
dmtc1 t1, $f2
|
|
dmtc1 t1, $f4
|
|
dmtc1 t1, $f6
|
|
dmtc1 t1, $f8
|
|
dmtc1 t1, $f10
|
|
dmtc1 t1, $f12
|
|
dmtc1 t1, $f14
|
|
dmtc1 t1, $f16
|
|
dmtc1 t1, $f18
|
|
dmtc1 t1, $f20
|
|
dmtc1 t1, $f22
|
|
dmtc1 t1, $f24
|
|
dmtc1 t1, $f26
|
|
dmtc1 t1, $f28
|
|
dmtc1 t1, $f30
|
|
#endif
|
|
jr ra
|
|
END(_init_fpu)
|
|
|
|
.set pop /* SET_HARDFLOAT */
|