395e095ed9
Use the newer idioms for setting PTRACE_O_xxx and PT_TRACE_xxx flags. Only set/clear tile-specific flags if the generic routine returns success, since otherwise we want to avoid setting any flags at all. Atomically update the ptrace flags with the new values. Eliminate the PT_TRACE_MASK_TILE bitmask and just shift PTRACE_O_MASK_TILE. Add a BUILD_BUG_ON to avoid overlapping with generic bits. Acked-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_PTRACE_H
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#define _ASM_TILE_PTRACE_H
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#include <linux/compiler.h>
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#ifndef __ASSEMBLY__
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/* Benefit from consistent use of "long" on all chips. */
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typedef unsigned long pt_reg_t;
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#endif
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#include <uapi/asm/ptrace.h>
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#define PTRACE_O_MASK_TILE (PTRACE_O_TRACEMIGRATE)
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#define PT_TRACE_MIGRATE PT_EVENT_FLAG(PTRACE_EVENT_MIGRATE)
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/* Flag bits in pt_regs.flags */
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#define PT_FLAGS_DISABLE_IRQ 1 /* on return to kernel, disable irqs */
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#define PT_FLAGS_CALLER_SAVES 2 /* caller-save registers are valid */
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#define PT_FLAGS_RESTORE_REGS 4 /* restore callee-save regs on return */
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#ifndef __ASSEMBLY__
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#define instruction_pointer(regs) ((regs)->pc)
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#define profile_pc(regs) instruction_pointer(regs)
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/* Does the process account for user or for system time? */
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#define user_mode(regs) (EX1_PL((regs)->ex1) == USER_PL)
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/* Fill in a struct pt_regs with the current kernel registers. */
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struct pt_regs *get_pt_regs(struct pt_regs *);
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/* Trace the current syscall. */
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extern void do_syscall_trace(void);
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#define arch_has_single_step() (1)
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/*
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* A structure for all single-stepper state.
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*
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* Also update defines in assembler section if it changes
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*/
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struct single_step_state {
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/* the page to which we will write hacked-up bundles */
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void __user *buffer;
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union {
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int flags;
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struct {
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unsigned long is_enabled:1, update:1, update_reg:6;
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};
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};
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unsigned long orig_pc; /* the original PC */
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unsigned long next_pc; /* return PC if no branch (PC + 1) */
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unsigned long branch_next_pc; /* return PC if we did branch/jump */
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unsigned long update_value; /* value to restore to update_target */
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};
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/* Single-step the instruction at regs->pc */
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extern void single_step_once(struct pt_regs *regs);
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/* Clean up after execve(). */
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extern void single_step_execve(void);
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struct task_struct;
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extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
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int error_code);
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#ifdef __tilegx__
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/* We need this since sigval_t has a user pointer in it, for GETSIGINFO etc. */
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#define __ARCH_WANT_COMPAT_SYS_PTRACE
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#endif
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#endif /* !__ASSEMBLY__ */
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#define SINGLESTEP_STATE_MASK_IS_ENABLED 0x1
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#define SINGLESTEP_STATE_MASK_UPDATE 0x2
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#define SINGLESTEP_STATE_TARGET_LB 2
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#define SINGLESTEP_STATE_TARGET_UB 7
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#endif /* _ASM_TILE_PTRACE_H */
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