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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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fd341abba6
Use the generic ptrace_resume code for PTRACE_SYSCALL, PTRACE_CONT, PTRACE_KILL and PTRACE_SINGLESTEP. This implies defining arch_has_single_step in <asm/ptrace.h> and implementing the user_enable_single_step and user_disable_single_step functions, which also causes the breakpoint information to be cleared on fork, which could be considered a bug fix. Also the TIF_SYSCALL_TRACE thread flag is now cleared on PTRACE_KILL which it previously wasn't, which is consistent with all architectures using the modern ptrace code. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Roland McGrath <roland@redhat.com> Acked-by: Matt Turner <mattst88@gmail.com> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
#ifndef _ASMAXP_PTRACE_H
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#define _ASMAXP_PTRACE_H
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/*
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* This struct defines the way the registers are stored on the
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* kernel stack during a system call or other kernel entry
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*
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* NOTE! I want to minimize the overhead of system calls, so this
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* struct has as little information as possible. I does not have
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*
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* - floating point regs: the kernel doesn't change those
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* - r9-15: saved by the C compiler
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*
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* This makes "fork()" and "exec()" a bit more complex, but should
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* give us low system call latency.
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*/
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struct pt_regs {
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unsigned long r0;
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unsigned long r1;
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unsigned long r2;
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unsigned long r3;
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unsigned long r4;
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unsigned long r5;
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unsigned long r6;
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unsigned long r7;
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unsigned long r8;
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unsigned long r19;
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unsigned long r20;
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unsigned long r21;
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unsigned long r22;
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unsigned long r23;
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unsigned long r24;
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unsigned long r25;
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unsigned long r26;
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unsigned long r27;
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unsigned long r28;
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unsigned long hae;
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/* JRP - These are the values provided to a0-a2 by PALcode */
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unsigned long trap_a0;
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unsigned long trap_a1;
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unsigned long trap_a2;
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/* These are saved by PAL-code: */
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unsigned long ps;
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unsigned long pc;
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unsigned long gp;
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unsigned long r16;
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unsigned long r17;
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unsigned long r18;
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};
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/*
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* This is the extended stack used by signal handlers and the context
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* switcher: it's pushed after the normal "struct pt_regs".
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*/
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struct switch_stack {
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unsigned long r9;
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unsigned long r10;
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unsigned long r11;
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unsigned long r12;
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unsigned long r13;
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unsigned long r14;
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unsigned long r15;
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unsigned long r26;
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unsigned long fp[32]; /* fp[31] is fpcr */
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};
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#ifdef __KERNEL__
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#define arch_has_single_step() (1)
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#define user_mode(regs) (((regs)->ps & 8) != 0)
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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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extern void show_regs(struct pt_regs *);
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#define task_pt_regs(task) \
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((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
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#define force_successful_syscall_return() (task_pt_regs(current)->r0 = 0)
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#endif
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#endif
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