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5ad18b2e60
Pull force_sig() argument change from Eric Biederman: "A source of error over the years has been that force_sig has taken a task parameter when it is only safe to use force_sig with the current task. The force_sig function is built for delivering synchronous signals such as SIGSEGV where the userspace application caused a synchronous fault (such as a page fault) and the kernel responded with a signal. Because the name force_sig does not make this clear, and because the force_sig takes a task parameter the function force_sig has been abused for sending other kinds of signals over the years. Slowly those have been fixed when the oopses have been tracked down. This set of changes fixes the remaining abusers of force_sig and carefully rips out the task parameter from force_sig and friends making this kind of error almost impossible in the future" * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (27 commits) signal/x86: Move tsk inside of CONFIG_MEMORY_FAILURE in do_sigbus signal: Remove the signal number and task parameters from force_sig_info signal: Factor force_sig_info_to_task out of force_sig_info signal: Generate the siginfo in force_sig signal: Move the computation of force into send_signal and correct it. signal: Properly set TRACE_SIGNAL_LOSE_INFO in __send_signal signal: Remove the task parameter from force_sig_fault signal: Use force_sig_fault_to_task for the two calls that don't deliver to current signal: Explicitly call force_sig_fault on current signal/unicore32: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from ptrace_break signal/nds32: Remove tsk parameter from send_sigtrap signal/riscv: Remove tsk parameter from do_trap signal/sh: Remove tsk parameter from force_sig_info_fault signal/um: Remove task parameter from send_sigtrap signal/x86: Remove task parameter from send_sigtrap signal: Remove task parameter from force_sig_mceerr signal: Remove task parameter from force_sig signal: Remove task parameter from force_sigsegv ...
267 lines
6.8 KiB
C
267 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2018 Andes Technology Corporation
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/sched/signal.h>
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#include <asm/processor.h>
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#include <asm/user.h>
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#include <asm/io.h>
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#include <asm/bitfield.h>
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#include <asm/fpu.h>
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const struct fpu_struct init_fpuregs = {
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.fd_regs = {[0 ... 31] = sNAN64},
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.fpcsr = FPCSR_INIT,
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#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
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.UDF_IEX_trap = 0
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#endif
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};
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void save_fpu(struct task_struct *tsk)
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{
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unsigned int fpcfg, fpcsr;
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enable_fpu();
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fpcfg = ((__nds32__fmfcfg() & FPCFG_mskFREG) >> FPCFG_offFREG);
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switch (fpcfg) {
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case SP32_DP32_reg:
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asm volatile ("fsdi $fd31, [%0+0xf8]\n\t"
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"fsdi $fd30, [%0+0xf0]\n\t"
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"fsdi $fd29, [%0+0xe8]\n\t"
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"fsdi $fd28, [%0+0xe0]\n\t"
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"fsdi $fd27, [%0+0xd8]\n\t"
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"fsdi $fd26, [%0+0xd0]\n\t"
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"fsdi $fd25, [%0+0xc8]\n\t"
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"fsdi $fd24, [%0+0xc0]\n\t"
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"fsdi $fd23, [%0+0xb8]\n\t"
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"fsdi $fd22, [%0+0xb0]\n\t"
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"fsdi $fd21, [%0+0xa8]\n\t"
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"fsdi $fd20, [%0+0xa0]\n\t"
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"fsdi $fd19, [%0+0x98]\n\t"
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"fsdi $fd18, [%0+0x90]\n\t"
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"fsdi $fd17, [%0+0x88]\n\t"
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"fsdi $fd16, [%0+0x80]\n\t"
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: /* no output */
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: "r" (&tsk->thread.fpu)
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: "memory");
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/* fall through */
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case SP32_DP16_reg:
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asm volatile ("fsdi $fd15, [%0+0x78]\n\t"
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"fsdi $fd14, [%0+0x70]\n\t"
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"fsdi $fd13, [%0+0x68]\n\t"
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"fsdi $fd12, [%0+0x60]\n\t"
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"fsdi $fd11, [%0+0x58]\n\t"
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"fsdi $fd10, [%0+0x50]\n\t"
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"fsdi $fd9, [%0+0x48]\n\t"
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"fsdi $fd8, [%0+0x40]\n\t"
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: /* no output */
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: "r" (&tsk->thread.fpu)
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: "memory");
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/* fall through */
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case SP16_DP8_reg:
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asm volatile ("fsdi $fd7, [%0+0x38]\n\t"
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"fsdi $fd6, [%0+0x30]\n\t"
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"fsdi $fd5, [%0+0x28]\n\t"
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"fsdi $fd4, [%0+0x20]\n\t"
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: /* no output */
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: "r" (&tsk->thread.fpu)
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: "memory");
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/* fall through */
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case SP8_DP4_reg:
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asm volatile ("fsdi $fd3, [%1+0x18]\n\t"
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"fsdi $fd2, [%1+0x10]\n\t"
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"fsdi $fd1, [%1+0x8]\n\t"
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"fsdi $fd0, [%1+0x0]\n\t"
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"fmfcsr %0\n\t"
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"swi %0, [%1+0x100]\n\t"
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: "=&r" (fpcsr)
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: "r"(&tsk->thread.fpu)
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: "memory");
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}
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disable_fpu();
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}
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void load_fpu(const struct fpu_struct *fpregs)
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{
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unsigned int fpcfg, fpcsr;
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enable_fpu();
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fpcfg = ((__nds32__fmfcfg() & FPCFG_mskFREG) >> FPCFG_offFREG);
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switch (fpcfg) {
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case SP32_DP32_reg:
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asm volatile ("fldi $fd31, [%0+0xf8]\n\t"
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"fldi $fd30, [%0+0xf0]\n\t"
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"fldi $fd29, [%0+0xe8]\n\t"
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"fldi $fd28, [%0+0xe0]\n\t"
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"fldi $fd27, [%0+0xd8]\n\t"
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"fldi $fd26, [%0+0xd0]\n\t"
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"fldi $fd25, [%0+0xc8]\n\t"
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"fldi $fd24, [%0+0xc0]\n\t"
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"fldi $fd23, [%0+0xb8]\n\t"
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"fldi $fd22, [%0+0xb0]\n\t"
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"fldi $fd21, [%0+0xa8]\n\t"
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"fldi $fd20, [%0+0xa0]\n\t"
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"fldi $fd19, [%0+0x98]\n\t"
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"fldi $fd18, [%0+0x90]\n\t"
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"fldi $fd17, [%0+0x88]\n\t"
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"fldi $fd16, [%0+0x80]\n\t"
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: /* no output */
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: "r" (fpregs));
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/* fall through */
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case SP32_DP16_reg:
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asm volatile ("fldi $fd15, [%0+0x78]\n\t"
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"fldi $fd14, [%0+0x70]\n\t"
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"fldi $fd13, [%0+0x68]\n\t"
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"fldi $fd12, [%0+0x60]\n\t"
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"fldi $fd11, [%0+0x58]\n\t"
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"fldi $fd10, [%0+0x50]\n\t"
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"fldi $fd9, [%0+0x48]\n\t"
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"fldi $fd8, [%0+0x40]\n\t"
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: /* no output */
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: "r" (fpregs));
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/* fall through */
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case SP16_DP8_reg:
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asm volatile ("fldi $fd7, [%0+0x38]\n\t"
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"fldi $fd6, [%0+0x30]\n\t"
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"fldi $fd5, [%0+0x28]\n\t"
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"fldi $fd4, [%0+0x20]\n\t"
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: /* no output */
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: "r" (fpregs));
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/* fall through */
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case SP8_DP4_reg:
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asm volatile ("fldi $fd3, [%1+0x18]\n\t"
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"fldi $fd2, [%1+0x10]\n\t"
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"fldi $fd1, [%1+0x8]\n\t"
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"fldi $fd0, [%1+0x0]\n\t"
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"lwi %0, [%1+0x100]\n\t"
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"fmtcsr %0\n\t":"=&r" (fpcsr)
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: "r"(fpregs));
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}
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disable_fpu();
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}
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void store_fpu_for_suspend(void)
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{
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#ifdef CONFIG_LAZY_FPU
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if (last_task_used_math != NULL)
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save_fpu(last_task_used_math);
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last_task_used_math = NULL;
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#else
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if (!used_math())
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return;
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unlazy_fpu(current);
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#endif
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clear_fpu(task_pt_regs(current));
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}
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inline void do_fpu_context_switch(struct pt_regs *regs)
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{
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/* Enable to use FPU. */
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if (!user_mode(regs)) {
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pr_err("BUG: FPU is used in kernel mode.\n");
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BUG();
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return;
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}
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enable_ptreg_fpu(regs);
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#ifdef CONFIG_LAZY_FPU //Lazy FPU is used
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if (last_task_used_math == current)
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return;
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if (last_task_used_math != NULL)
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/* Other processes fpu state, save away */
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save_fpu(last_task_used_math);
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last_task_used_math = current;
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#endif
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if (used_math()) {
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load_fpu(¤t->thread.fpu);
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} else {
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/* First time FPU user. */
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load_fpu(&init_fpuregs);
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#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
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current->thread.fpu.UDF_IEX_trap = init_fpuregs.UDF_IEX_trap;
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#endif
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set_used_math();
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}
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}
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inline void fill_sigfpe_signo(unsigned int fpcsr, int *signo)
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{
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if (fpcsr & FPCSR_mskOVFT)
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*signo = FPE_FLTOVF;
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#ifndef CONFIG_SUPPORT_DENORMAL_ARITHMETIC
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else if (fpcsr & FPCSR_mskUDFT)
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*signo = FPE_FLTUND;
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#endif
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else if (fpcsr & FPCSR_mskIVOT)
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*signo = FPE_FLTINV;
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else if (fpcsr & FPCSR_mskDBZT)
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*signo = FPE_FLTDIV;
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else if (fpcsr & FPCSR_mskIEXT)
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*signo = FPE_FLTRES;
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}
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inline void handle_fpu_exception(struct pt_regs *regs)
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{
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unsigned int fpcsr;
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int si_code = 0, si_signo = SIGFPE;
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#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
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unsigned long redo_except = FPCSR_mskDNIT|FPCSR_mskUDFT|FPCSR_mskIEXT;
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#else
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unsigned long redo_except = FPCSR_mskDNIT;
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#endif
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lose_fpu();
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fpcsr = current->thread.fpu.fpcsr;
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if (fpcsr & redo_except) {
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si_signo = do_fpuemu(regs, ¤t->thread.fpu);
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fpcsr = current->thread.fpu.fpcsr;
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if (!si_signo) {
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current->thread.fpu.fpcsr &= ~(redo_except);
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goto done;
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}
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} else if (fpcsr & FPCSR_mskRIT) {
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if (!user_mode(regs))
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do_exit(SIGILL);
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si_signo = SIGILL;
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}
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switch (si_signo) {
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case SIGFPE:
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fill_sigfpe_signo(fpcsr, &si_code);
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break;
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case SIGILL:
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show_regs(regs);
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si_code = ILL_COPROC;
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break;
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case SIGBUS:
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si_code = BUS_ADRERR;
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break;
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default:
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break;
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}
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force_sig_fault(si_signo, si_code,
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(void __user *)instruction_pointer(regs));
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done:
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own_fpu();
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}
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bool do_fpu_exception(unsigned int subtype, struct pt_regs *regs)
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{
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int done = true;
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/* Coprocessor disabled exception */
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if (subtype == FPU_DISABLE_EXCEPTION) {
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preempt_disable();
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do_fpu_context_switch(regs);
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preempt_enable();
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}
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/* Coprocessor exception such as underflow and overflow */
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else if (subtype == FPU_EXCEPTION)
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handle_fpu_exception(regs);
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else
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done = false;
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return done;
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}
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