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xtensa: use generic ptrace_resume code
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> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -113,6 +113,7 @@ struct pt_regs {
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#include <variant/core.h>
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# define arch_has_single_step() (1)
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# define task_pt_regs(tsk) ((struct pt_regs*) \
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(task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
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# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
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@ -30,6 +30,17 @@
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#include <asm/elf.h>
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#include <asm/coprocessor.h>
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void user_enable_single_step(struct task_struct *child)
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{
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child->ptrace |= PT_SINGLESTEP;
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}
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void user_disable_single_step(struct task_struct *child)
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{
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child->ptrace &= ~PT_SINGLESTEP;
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}
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/*
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* Called by kernel/ptrace.c when detaching to disable single stepping.
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*/
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@ -268,51 +279,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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ret = ptrace_pokeusr(child, addr, data);
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break;
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/* continue and stop at next (return from) syscall */
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case PTRACE_SYSCALL:
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case PTRACE_CONT: /* restart after signal. */
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{
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ret = -EIO;
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if (!valid_signal(data))
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break;
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if (request == PTRACE_SYSCALL)
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set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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else
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->exit_code = data;
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/* Make sure the single step bit is not set. */
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child->ptrace &= ~PT_SINGLESTEP;
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wake_up_process(child);
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ret = 0;
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break;
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}
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/*
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* make the child exit. Best I can do is send it a sigkill.
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* perhaps it should be put in the status that it wants to
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* exit.
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*/
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case PTRACE_KILL:
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ret = 0;
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if (child->exit_state == EXIT_ZOMBIE) /* already dead */
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break;
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child->exit_code = SIGKILL;
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child->ptrace &= ~PT_SINGLESTEP;
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wake_up_process(child);
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break;
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case PTRACE_SINGLESTEP:
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ret = -EIO;
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if (!valid_signal(data))
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break;
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->ptrace |= PT_SINGLESTEP;
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child->exit_code = data;
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wake_up_process(child);
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ret = 0;
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break;
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case PTRACE_GETREGS:
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ret = ptrace_getregs(child, (void __user *) data);
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break;
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