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Diffstat (limited to 'arch/nds32/kernel/fpu.c')
-rw-r--r--arch/nds32/kernel/fpu.c266
1 files changed, 0 insertions, 266 deletions
diff --git a/arch/nds32/kernel/fpu.c b/arch/nds32/kernel/fpu.c
deleted file mode 100644
index 701c09a668de..000000000000
--- a/arch/nds32/kernel/fpu.c
+++ /dev/null
@@ -1,266 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2005-2018 Andes Technology Corporation
-
-#include <linux/sched.h>
-#include <linux/signal.h>
-#include <linux/sched/signal.h>
-#include <asm/processor.h>
-#include <asm/user.h>
-#include <asm/io.h>
-#include <asm/bitfield.h>
-#include <asm/fpu.h>
-
-const struct fpu_struct init_fpuregs = {
- .fd_regs = {[0 ... 31] = sNAN64},
- .fpcsr = FPCSR_INIT,
-#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
- .UDF_IEX_trap = 0
-#endif
-};
-
-void save_fpu(struct task_struct *tsk)
-{
- unsigned int fpcfg, fpcsr;
-
- enable_fpu();
- fpcfg = ((__nds32__fmfcfg() & FPCFG_mskFREG) >> FPCFG_offFREG);
- switch (fpcfg) {
- case SP32_DP32_reg:
- asm volatile ("fsdi $fd31, [%0+0xf8]\n\t"
- "fsdi $fd30, [%0+0xf0]\n\t"
- "fsdi $fd29, [%0+0xe8]\n\t"
- "fsdi $fd28, [%0+0xe0]\n\t"
- "fsdi $fd27, [%0+0xd8]\n\t"
- "fsdi $fd26, [%0+0xd0]\n\t"
- "fsdi $fd25, [%0+0xc8]\n\t"
- "fsdi $fd24, [%0+0xc0]\n\t"
- "fsdi $fd23, [%0+0xb8]\n\t"
- "fsdi $fd22, [%0+0xb0]\n\t"
- "fsdi $fd21, [%0+0xa8]\n\t"
- "fsdi $fd20, [%0+0xa0]\n\t"
- "fsdi $fd19, [%0+0x98]\n\t"
- "fsdi $fd18, [%0+0x90]\n\t"
- "fsdi $fd17, [%0+0x88]\n\t"
- "fsdi $fd16, [%0+0x80]\n\t"
- : /* no output */
- : "r" (&tsk->thread.fpu)
- : "memory");
- fallthrough;
- case SP32_DP16_reg:
- asm volatile ("fsdi $fd15, [%0+0x78]\n\t"
- "fsdi $fd14, [%0+0x70]\n\t"
- "fsdi $fd13, [%0+0x68]\n\t"
- "fsdi $fd12, [%0+0x60]\n\t"
- "fsdi $fd11, [%0+0x58]\n\t"
- "fsdi $fd10, [%0+0x50]\n\t"
- "fsdi $fd9, [%0+0x48]\n\t"
- "fsdi $fd8, [%0+0x40]\n\t"
- : /* no output */
- : "r" (&tsk->thread.fpu)
- : "memory");
- fallthrough;
- case SP16_DP8_reg:
- asm volatile ("fsdi $fd7, [%0+0x38]\n\t"
- "fsdi $fd6, [%0+0x30]\n\t"
- "fsdi $fd5, [%0+0x28]\n\t"
- "fsdi $fd4, [%0+0x20]\n\t"
- : /* no output */
- : "r" (&tsk->thread.fpu)
- : "memory");
- fallthrough;
- case SP8_DP4_reg:
- asm volatile ("fsdi $fd3, [%1+0x18]\n\t"
- "fsdi $fd2, [%1+0x10]\n\t"
- "fsdi $fd1, [%1+0x8]\n\t"
- "fsdi $fd0, [%1+0x0]\n\t"
- "fmfcsr %0\n\t"
- "swi %0, [%1+0x100]\n\t"
- : "=&r" (fpcsr)
- : "r"(&tsk->thread.fpu)
- : "memory");
- }
- disable_fpu();
-}
-
-void load_fpu(const struct fpu_struct *fpregs)
-{
- unsigned int fpcfg, fpcsr;
-
- enable_fpu();
- fpcfg = ((__nds32__fmfcfg() & FPCFG_mskFREG) >> FPCFG_offFREG);
- switch (fpcfg) {
- case SP32_DP32_reg:
- asm volatile ("fldi $fd31, [%0+0xf8]\n\t"
- "fldi $fd30, [%0+0xf0]\n\t"
- "fldi $fd29, [%0+0xe8]\n\t"
- "fldi $fd28, [%0+0xe0]\n\t"
- "fldi $fd27, [%0+0xd8]\n\t"
- "fldi $fd26, [%0+0xd0]\n\t"
- "fldi $fd25, [%0+0xc8]\n\t"
- "fldi $fd24, [%0+0xc0]\n\t"
- "fldi $fd23, [%0+0xb8]\n\t"
- "fldi $fd22, [%0+0xb0]\n\t"
- "fldi $fd21, [%0+0xa8]\n\t"
- "fldi $fd20, [%0+0xa0]\n\t"
- "fldi $fd19, [%0+0x98]\n\t"
- "fldi $fd18, [%0+0x90]\n\t"
- "fldi $fd17, [%0+0x88]\n\t"
- "fldi $fd16, [%0+0x80]\n\t"
- : /* no output */
- : "r" (fpregs));
- fallthrough;
- case SP32_DP16_reg:
- asm volatile ("fldi $fd15, [%0+0x78]\n\t"
- "fldi $fd14, [%0+0x70]\n\t"
- "fldi $fd13, [%0+0x68]\n\t"
- "fldi $fd12, [%0+0x60]\n\t"
- "fldi $fd11, [%0+0x58]\n\t"
- "fldi $fd10, [%0+0x50]\n\t"
- "fldi $fd9, [%0+0x48]\n\t"
- "fldi $fd8, [%0+0x40]\n\t"
- : /* no output */
- : "r" (fpregs));
- fallthrough;
- case SP16_DP8_reg:
- asm volatile ("fldi $fd7, [%0+0x38]\n\t"
- "fldi $fd6, [%0+0x30]\n\t"
- "fldi $fd5, [%0+0x28]\n\t"
- "fldi $fd4, [%0+0x20]\n\t"
- : /* no output */
- : "r" (fpregs));
- fallthrough;
- case SP8_DP4_reg:
- asm volatile ("fldi $fd3, [%1+0x18]\n\t"
- "fldi $fd2, [%1+0x10]\n\t"
- "fldi $fd1, [%1+0x8]\n\t"
- "fldi $fd0, [%1+0x0]\n\t"
- "lwi %0, [%1+0x100]\n\t"
- "fmtcsr %0\n\t":"=&r" (fpcsr)
- : "r"(fpregs));
- }
- disable_fpu();
-}
-void store_fpu_for_suspend(void)
-{
-#ifdef CONFIG_LAZY_FPU
- if (last_task_used_math != NULL)
- save_fpu(last_task_used_math);
- last_task_used_math = NULL;
-#else
- if (!used_math())
- return;
- unlazy_fpu(current);
-#endif
- clear_fpu(task_pt_regs(current));
-}
-inline void do_fpu_context_switch(struct pt_regs *regs)
-{
- /* Enable to use FPU. */
-
- if (!user_mode(regs)) {
- pr_err("BUG: FPU is used in kernel mode.\n");
- BUG();
- return;
- }
-
- enable_ptreg_fpu(regs);
-#ifdef CONFIG_LAZY_FPU //Lazy FPU is used
- if (last_task_used_math == current)
- return;
- if (last_task_used_math != NULL)
- /* Other processes fpu state, save away */
- save_fpu(last_task_used_math);
- last_task_used_math = current;
-#endif
- if (used_math()) {
- load_fpu(&current->thread.fpu);
- } else {
- /* First time FPU user. */
- load_fpu(&init_fpuregs);
-#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
- current->thread.fpu.UDF_IEX_trap = init_fpuregs.UDF_IEX_trap;
-#endif
- set_used_math();
- }
-
-}
-
-inline void fill_sigfpe_signo(unsigned int fpcsr, int *signo)
-{
- if (fpcsr & FPCSR_mskOVFT)
- *signo = FPE_FLTOVF;
-#ifndef CONFIG_SUPPORT_DENORMAL_ARITHMETIC
- else if (fpcsr & FPCSR_mskUDFT)
- *signo = FPE_FLTUND;
-#endif
- else if (fpcsr & FPCSR_mskIVOT)
- *signo = FPE_FLTINV;
- else if (fpcsr & FPCSR_mskDBZT)
- *signo = FPE_FLTDIV;
- else if (fpcsr & FPCSR_mskIEXT)
- *signo = FPE_FLTRES;
-}
-
-inline void handle_fpu_exception(struct pt_regs *regs)
-{
- unsigned int fpcsr;
- int si_code = 0, si_signo = SIGFPE;
-#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
- unsigned long redo_except = FPCSR_mskDNIT|FPCSR_mskUDFT|FPCSR_mskIEXT;
-#else
- unsigned long redo_except = FPCSR_mskDNIT;
-#endif
-
- lose_fpu();
- fpcsr = current->thread.fpu.fpcsr;
-
- if (fpcsr & redo_except) {
- si_signo = do_fpuemu(regs, &current->thread.fpu);
- fpcsr = current->thread.fpu.fpcsr;
- if (!si_signo) {
- current->thread.fpu.fpcsr &= ~(redo_except);
- goto done;
- }
- } else if (fpcsr & FPCSR_mskRIT) {
- if (!user_mode(regs))
- make_task_dead(SIGILL);
- si_signo = SIGILL;
- }
-
- switch (si_signo) {
- case SIGFPE:
- fill_sigfpe_signo(fpcsr, &si_code);
- break;
- case SIGILL:
- show_regs(regs);
- si_code = ILL_COPROC;
- break;
- case SIGBUS:
- si_code = BUS_ADRERR;
- break;
- default:
- break;
- }
-
- force_sig_fault(si_signo, si_code,
- (void __user *)instruction_pointer(regs));
-done:
- own_fpu();
-}
-
-bool do_fpu_exception(unsigned int subtype, struct pt_regs *regs)
-{
- int done = true;
- /* Coprocessor disabled exception */
- if (subtype == FPU_DISABLE_EXCEPTION) {
- preempt_disable();
- do_fpu_context_switch(regs);
- preempt_enable();
- }
- /* Coprocessor exception such as underflow and overflow */
- else if (subtype == FPU_EXCEPTION)
- handle_fpu_exception(regs);
- else
- done = false;
- return done;
-}
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