3d5e80125a
Accumulator is present in configs with FPU and/or DSP MPY (mpy > 6) Instead of doing this in pt_regs (and thus every kernel entry/exit), this could have been done in context switch (and for user task only) as currently kernel doesn't clobber these registers for its own accord. However we will soon start using 64-bit multiply instructions for kernel which can clobber these. Also gcc folks also plan to start using these as GPRs, hence better to always save/restore them Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
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*/
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#ifndef __ASM_ARC_PTRACE_H
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#define __ASM_ARC_PTRACE_H
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#include <uapi/asm/ptrace.h>
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#ifndef __ASSEMBLY__
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/* THE pt_regs: Defines how regs are saved during entry into kernel */
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#ifdef CONFIG_ISA_ARCOMPACT
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struct pt_regs {
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/* Real registers */
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unsigned long bta; /* bta_l1, bta_l2, erbta */
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unsigned long lp_start, lp_end, lp_count;
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unsigned long status32; /* status32_l1, status32_l2, erstatus */
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unsigned long ret; /* ilink1, ilink2 or eret */
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unsigned long blink;
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unsigned long fp;
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unsigned long r26; /* gp */
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unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
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unsigned long sp; /* User/Kernel depending on where we came from */
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unsigned long orig_r0;
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/*
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* To distinguish bet excp, syscall, irq
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* For traps and exceptions, Exception Cause Register.
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* ECR: <00> <VV> <CC> <PP>
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* Last word used by Linux for extra state mgmt (syscall-restart)
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* For interrupts, use artificial ECR values to note current prio-level
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*/
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union {
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struct {
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#ifdef CONFIG_CPU_BIG_ENDIAN
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unsigned long state:8, ecr_vec:8,
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ecr_cause:8, ecr_param:8;
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#else
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unsigned long ecr_param:8, ecr_cause:8,
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ecr_vec:8, state:8;
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#endif
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};
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unsigned long event;
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};
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unsigned long user_r25;
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};
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#else
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struct pt_regs {
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unsigned long orig_r0;
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union {
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struct {
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#ifdef CONFIG_CPU_BIG_ENDIAN
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unsigned long state:8, ecr_vec:8,
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ecr_cause:8, ecr_param:8;
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#else
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unsigned long ecr_param:8, ecr_cause:8,
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ecr_vec:8, state:8;
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#endif
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};
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unsigned long event;
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};
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unsigned long bta; /* bta_l1, bta_l2, erbta */
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unsigned long user_r25;
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unsigned long r26; /* gp */
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unsigned long fp;
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unsigned long sp; /* user/kernel sp depending on where we came from */
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unsigned long r12, r30;
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#ifdef CONFIG_ARC_HAS_ACCL_REGS
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unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
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#endif
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/*------- Below list auto saved by h/w -----------*/
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unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
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unsigned long blink;
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unsigned long lp_end, lp_start, lp_count;
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unsigned long ei, ldi, jli;
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unsigned long ret;
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unsigned long status32;
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};
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#endif
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/* Callee saved registers - need to be saved only when you are scheduled out */
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struct callee_regs {
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unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
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};
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#define instruction_pointer(regs) ((regs)->ret)
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#define profile_pc(regs) instruction_pointer(regs)
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/* return 1 if user mode or 0 if kernel mode */
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#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
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#define user_stack_pointer(regs)\
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({ unsigned int sp; \
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if (user_mode(regs)) \
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sp = (regs)->sp;\
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else \
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sp = -1; \
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sp; \
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})
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/* return 1 if PC in delay slot */
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#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
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#define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
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#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
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#define STATE_SCALL_RESTARTED 0x01
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#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
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#define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)
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#define current_pt_regs() \
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({ \
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/* open-coded current_thread_info() */ \
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register unsigned long sp asm ("sp"); \
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unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
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(struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
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})
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static inline long regs_return_value(struct pt_regs *regs)
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{
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return (long)regs->r0;
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_PTRACE_H */
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