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nommu: ptrace support

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The patch below adds ARM ptrace functions to get the process load address.
This is required for useful userspace debugging on mmuless systems.  These
values are obtained by reading magic offsets with PTRACE_PEEKUSR, as on other
nommu targets. I picked arbitrary large values for the offsets.

Signed-off-by: Paul Brook <paul@codesourcery.com>
This commit is contained in:
Paul Brook 2009-07-24 12:34:58 +01:00 committed by Catalin Marinas
parent 5d57795e26
commit 68b7f7153f
2 changed files with 15 additions and 1 deletions
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8
arch/arm/include/asm/ptrace.h
View file

@ -82,6 +82,14 @@
#define PSR_ENDSTATE 0
#endif
/*
* These are 'magic' values for PTRACE_PEEKUSR that return info about where a
* process is located in memory.
*/
#define PT_TEXT_ADDR 0x10000
#define PT_DATA_ADDR 0x10004
#define PT_TEXT_END_ADDR 0x10008
#ifndef __ASSEMBLY__
/*

8
arch/arm/kernel/ptrace.c
View file

@ -521,7 +521,13 @@ static int ptrace_read_user(struct task_struct *tsk, unsigned long off,
return -EIO;
tmp = 0;
if (off < sizeof(struct pt_regs))
if (off == PT_TEXT_ADDR)
tmp = tsk->mm->start_code;
else if (off == PT_DATA_ADDR)
tmp = tsk->mm->start_data;
else if (off == PT_TEXT_END_ADDR)
tmp = tsk->mm->end_code;
else if (off < sizeof(struct pt_regs))
tmp = get_user_reg(tsk, off >> 2);
return put_user(tmp, ret);