cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

r2300_fpu.S (2907B)

      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (C) 1996, 1998 by Ralf Baechle
      7 *
      8 * Multi-arch abstraction and asm macros for easier reading:
      9 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
     10 *
     11 * Further modifications to make this work:
     12 * Copyright (c) 1998 Harald Koerfgen
     13 */
     14#include <asm/asm.h>
     15#include <asm/asmmacro.h>
     16#include <asm/errno.h>
     17#include <asm/export.h>
     18#include <asm/fpregdef.h>
     19#include <asm/mipsregs.h>
     20#include <asm/asm-offsets.h>
     21#include <asm/regdef.h>
     22
     23#define EX(a,b)							\
     249:	a,##b;							\
     25	.section __ex_table,"a";				\
     26	PTR_WD	9b,fault;					\
     27	.previous
     28
     29#define EX2(a,b)						\
     309:	a,##b;							\
     31	.section __ex_table,"a";				\
     32	PTR_WD	9b,fault;					\
     33	PTR_WD	9b+4,fault;					\
     34	.previous
     35
     36	.set	mips1
     37
     38/*
     39 * Save a thread's fp context.
     40 */
     41LEAF(_save_fp)
     42EXPORT_SYMBOL(_save_fp)
     43	fpu_save_single a0, t1			# clobbers t1
     44	jr	ra
     45	END(_save_fp)
     46
     47/*
     48 * Restore a thread's fp context.
     49 */
     50LEAF(_restore_fp)
     51	fpu_restore_single a0, t1		# clobbers t1
     52	jr	ra
     53	END(_restore_fp)
     54
     55	.set	noreorder
     56
     57/**
     58 * _save_fp_context() - save FP context from the FPU
     59 * @a0 - pointer to fpregs field of sigcontext
     60 * @a1 - pointer to fpc_csr field of sigcontext
     61 *
     62 * Save FP context, including the 32 FP data registers and the FP
     63 * control & status register, from the FPU to signal context.
     64 */
     65LEAF(_save_fp_context)
     66	.set	push
     67	SET_HARDFLOAT
     68	li	v0, 0					# assume success
     69	cfc1	t1, fcr31
     70	EX2(s.d $f0, 0(a0))
     71	EX2(s.d $f2, 16(a0))
     72	EX2(s.d $f4, 32(a0))
     73	EX2(s.d $f6, 48(a0))
     74	EX2(s.d $f8, 64(a0))
     75	EX2(s.d $f10, 80(a0))
     76	EX2(s.d $f12, 96(a0))
     77	EX2(s.d $f14, 112(a0))
     78	EX2(s.d $f16, 128(a0))
     79	EX2(s.d $f18, 144(a0))
     80	EX2(s.d $f20, 160(a0))
     81	EX2(s.d $f22, 176(a0))
     82	EX2(s.d $f24, 192(a0))
     83	EX2(s.d $f26, 208(a0))
     84	EX2(s.d $f28, 224(a0))
     85	EX2(s.d $f30, 240(a0))
     86	jr	ra
     87	 EX(sw	t1, (a1))
     88	.set	pop
     89	END(_save_fp_context)
     90
     91/**
     92 * _restore_fp_context() - restore FP context to the FPU
     93 * @a0 - pointer to fpregs field of sigcontext
     94 * @a1 - pointer to fpc_csr field of sigcontext
     95 *
     96 * Restore FP context, including the 32 FP data registers and the FP
     97 * control & status register, from signal context to the FPU.
     98 */
     99LEAF(_restore_fp_context)
    100	.set	push
    101	SET_HARDFLOAT
    102	li	v0, 0					# assume success
    103	EX(lw t0, (a1))
    104	EX2(l.d $f0, 0(a0))
    105	EX2(l.d $f2, 16(a0))
    106	EX2(l.d $f4, 32(a0))
    107	EX2(l.d $f6, 48(a0))
    108	EX2(l.d $f8, 64(a0))
    109	EX2(l.d $f10, 80(a0))
    110	EX2(l.d $f12, 96(a0))
    111	EX2(l.d $f14, 112(a0))
    112	EX2(l.d $f16, 128(a0))
    113	EX2(l.d $f18, 144(a0))
    114	EX2(l.d $f20, 160(a0))
    115	EX2(l.d $f22, 176(a0))
    116	EX2(l.d $f24, 192(a0))
    117	EX2(l.d $f26, 208(a0))
    118	EX2(l.d $f28, 224(a0))
    119	EX2(l.d $f30, 240(a0))
    120	jr	ra
    121	 ctc1	t0, fcr31
    122	.set	pop
    123	END(_restore_fp_context)
    124	.set	reorder
    125
    126	.type	fault, @function
    127	.ent	fault
    128fault:	li	v0, -EFAULT
    129	jr	ra
    130	.end	fault