187 lines
4.5 KiB
C
187 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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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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#include <linux/compiler.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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#define MAX_REG_OFFSET offsetof(struct pt_regs, user_r25)
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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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#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
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unsigned long DSP_CTRL;
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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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#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)
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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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static inline void instruction_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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instruction_pointer(regs) = val;
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}
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static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
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{
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return regs->sp;
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}
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extern int regs_query_register_offset(const char *name);
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extern const char *regs_query_register_name(unsigned int offset);
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extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
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extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
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unsigned int n);
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static inline unsigned long regs_get_register(struct pt_regs *regs,
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unsigned int offset)
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{
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if (unlikely(offset > MAX_REG_OFFSET))
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return 0;
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return *(unsigned long *)((unsigned long)regs + offset);
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_PTRACE_H */
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