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Blackfin: ptrace: enable access to L1 stacks

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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;
}