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Blackfin: ptrace: enable access to L1 stacks 

If an app is placing its stack in L1 scratchpad SRAM, make sure ptrace
is granted access to it so that gdb can do its thing.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Barry Song 2010-06-21 10:19:50 +00:00 committed by Mike Frysinger
parent c5af5451fc
commit 175671e75c
1 changed files with 8 additions and 0 deletions
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8
arch/blackfin/kernel/ptrace.c
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@ -27,6 +27,7 @@
#include <asm/fixed_code.h>
#include <asm/cacheflush.h>
#include <asm/mem_map.h>
#include <asm/mmu_context.h>
/*
* does not yet catch signals sent when the child dies.
@ -135,6 +136,13 @@ static inline int is_user_addr_valid(struct task_struct *child,
if (start >= FIXED_CODE_START && start + len < FIXED_CODE_END)
return 0;
#ifdef CONFIG_APP_STACK_L1
if (child->mm->context.l1_stack_save)
if (start >= (unsigned long)l1_stack_base &&
start + len < (unsigned long)l1_stack_base + l1_stack_len)
return 0;
#endif
return -EIO;
}