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authorpatacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>2013-02-28 15:31:58 +0000
committerpatacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>2013-02-28 15:31:58 +0000
commit8bf2bd9ff858b953091e9c06fd573e02dcfefe5a (patch)
tree617198360881b74f55be80d10213f03cdf23dbfa /nuttx/arch/sh
parentf6b940c07fd543138ca4b856731fcf774edebeed (diff)
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Add debug output when memory allocations fail
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5686 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/sh')
-rw-r--r--nuttx/arch/sh/src/common/up_createstack.c110
1 files changed, 70 insertions, 40 deletions
diff --git a/nuttx/arch/sh/src/common/up_createstack.c b/nuttx/arch/sh/src/common/up_createstack.c
index f868750de..296245a49 100644
--- a/nuttx/arch/sh/src/common/up_createstack.c
+++ b/nuttx/arch/sh/src/common/up_createstack.c
@@ -1,7 +1,7 @@
/****************************************************************************
* arch/sh/src/common/up_createstack.c
*
- * Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
+ * Copyright (C) 2008-2009, 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -66,67 +66,97 @@
* Name: up_create_stack
*
* Description:
- * Allocate a stack for a new thread and setup
- * up stack-related information in the TCB.
+ * Allocate a stack for a new thread and setup up stack-related
+ * information in the TCB.
*
* The following TCB fields must be initialized:
- * adj_stack_size: Stack size after adjustment for hardware,
- * processor, etc. This value is retained only for debug
- * purposes.
+ * adj_stack_size: Stack size after adjustment for hardware, processor,
+ * etc. This value is retained only for debug purposes.
* stack_alloc_ptr: Pointer to allocated stack
- * adj_stack_ptr: Adjusted stack_alloc_ptr for HW. The
- * initial value of the stack pointer.
+ * adj_stack_ptr: Adjusted stack_alloc_ptr for HW. The initial value of
+ * the stack pointer.
*
- * Inputs:
+ * Input Parameters:
* tcb: The TCB of new task
- * stack_size: The requested stack size. At least this much
- * must be allocated.
+ * stack_size: The requested stack size. At least this how much must be
+ * allocated.
+ *
****************************************************************************/
int up_create_stack(struct tcb_s *tcb, size_t stack_size)
{
- if (tcb->stack_alloc_ptr &&
- tcb->adj_stack_size != stack_size)
+ /* Is there already a stack allocated of a different size? */
+
+ if (tcb->stack_alloc_ptr && tcb->adj_stack_size != stack_size)
{
+ /* Yes.. free it */
+
sched_free(tcb->stack_alloc_ptr);
tcb->stack_alloc_ptr = NULL;
}
- if (!tcb->stack_alloc_ptr)
- {
- tcb->stack_alloc_ptr = (uint32_t*)kzalloc(stack_size);
- }
+ /* Do we need to allocate a stack? */
- if (tcb->stack_alloc_ptr)
- {
- size_t top_of_stack;
- size_t size_of_stack;
+ if (!tcb->stack_alloc_ptr)
+ {
+ /* Allocate the stack. If DEBUG is enabled (but not stack debug),
+ * then create a zeroed stack to make stack dumps easier to trace.
+ */
+
+#if defined(CONFIG_DEBUG) && !defined(CONFIG_DEBUG_STACK)
+ tcb->stack_alloc_ptr = (uint32_t *)kzalloc(stack_size);
+#else
+ tcb->stack_alloc_ptr = (uint32_t *)kmalloc(stack_size);
+#endif
+#ifdef CONFIG_DEBUG
+ if (!tcb->stack_alloc_ptr)
+ {
+ sdbg("ERROR: Failed to allocate stack, size %d\n", stack_size);
+ }
+#endif
+ }
- /* The Arm7Tdmi uses a push-down stack: the stack grows
- * toward loweraddresses in memory. The stack pointer
- * register, points to the lowest, valid work address
- * (the "top" of the stack). Items on the stack are
- * referenced as positive word offsets from sp.
- */
+ /* Did we successfully allocate a stack? */
- top_of_stack = (uint32_t)tcb->stack_alloc_ptr + stack_size - 4;
+ if (tcb->stack_alloc_ptr)
+ {
+ size_t top_of_stack;
+ size_t size_of_stack;
- /* The Arm7Tdmi stack must be aligned at word (4 byte)
- * boundaries. If necessary top_of_stack must be rounded
- * down to the next boundary
- */
+ /* Yes.. If stack debug is enabled, then fill the stack with a
+ * recognizable value that we can use later to test for high
+ * water marks.
+ */
- top_of_stack &= ~3;
- size_of_stack = top_of_stack - (uint32_t)tcb->stack_alloc_ptr + 4;
+#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_STACK)
+ memset(tcb->stack_alloc_ptr, 0xaa, stack_size);
+#endif
- /* Save the adjusted stack values in the struct tcb_s */
+ /* The SH family uses a push-down stack: the stack grows
+ * toward loweraddresses in memory. The stack pointer
+ * register, points to the lowest, valid work address
+ * (the "top" of the stack). Items on the stack are
+ * referenced as positive word offsets from sp.
+ */
- tcb->adj_stack_ptr = (uint32_t*)top_of_stack;
- tcb->adj_stack_size = size_of_stack;
+ top_of_stack = (uint32_t)tcb->stack_alloc_ptr + stack_size - 4;
- up_ledon(LED_STACKCREATED);
- return OK;
- }
+ /* The SH stack must be aligned at word (4 byte)
+ * boundaries. If necessary top_of_stack must be rounded
+ * down to the next boundary
+ */
+
+ top_of_stack &= ~3;
+ size_of_stack = top_of_stack - (uint32_t)tcb->stack_alloc_ptr + 4;
+
+ /* Save the adjusted stack values in the struct tcb_s */
+
+ tcb->adj_stack_ptr = (uint32_t*)top_of_stack;
+ tcb->adj_stack_size = size_of_stack;
+
+ up_ledon(LED_STACKCREATED);
+ return OK;
+ }
return ERROR;
}