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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8508488fe7
Add logic needed to properly calculate exceptions for delay slots when in MIPS16e mode. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996, 1997, 1998, 2001 by Ralf Baechle
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*/
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#ifndef _ASM_BRANCH_H
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#define _ASM_BRANCH_H
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#include <asm/ptrace.h>
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#include <asm/inst.h>
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extern int __isa_exception_epc(struct pt_regs *regs);
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extern int __compute_return_epc(struct pt_regs *regs);
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extern int __compute_return_epc_for_insn(struct pt_regs *regs,
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union mips_instruction insn);
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extern int __microMIPS_compute_return_epc(struct pt_regs *regs);
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extern int __MIPS16e_compute_return_epc(struct pt_regs *regs);
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static inline int delay_slot(struct pt_regs *regs)
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{
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return regs->cp0_cause & CAUSEF_BD;
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}
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static inline unsigned long exception_epc(struct pt_regs *regs)
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{
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if (likely(!delay_slot(regs)))
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return regs->cp0_epc;
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if (get_isa16_mode(regs->cp0_epc))
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return __isa_exception_epc(regs);
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return regs->cp0_epc + 4;
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}
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#define BRANCH_LIKELY_TAKEN 0x0001
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static inline int compute_return_epc(struct pt_regs *regs)
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{
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if (get_isa16_mode(regs->cp0_epc)) {
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if (cpu_has_mmips)
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return __microMIPS_compute_return_epc(regs);
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if (cpu_has_mips16)
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return __MIPS16e_compute_return_epc(regs);
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return regs->cp0_epc;
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}
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if (!delay_slot(regs)) {
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regs->cp0_epc += 4;
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return 0;
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}
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return __compute_return_epc(regs);
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}
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static inline int MIPS16e_compute_return_epc(struct pt_regs *regs,
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union mips16e_instruction *inst)
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{
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if (likely(!delay_slot(regs))) {
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if (inst->ri.opcode == MIPS16e_extend_op) {
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regs->cp0_epc += 4;
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return 0;
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}
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regs->cp0_epc += 2;
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return 0;
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}
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return __MIPS16e_compute_return_epc(regs);
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}
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#endif /* _ASM_BRANCH_H */
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