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-rw-r--r--arch/sh/kernel/cpu/sh3/entry.S3
-rw-r--r--arch/sh/kernel/dwarf.c194
-rw-r--r--arch/sh/kernel/entry-common.S8
3 files changed, 149 insertions, 56 deletions
diff --git a/arch/sh/kernel/cpu/sh3/entry.S b/arch/sh/kernel/cpu/sh3/entry.S
index 3f7e2a2..f6a389c 100644
--- a/arch/sh/kernel/cpu/sh3/entry.S
+++ b/arch/sh/kernel/cpu/sh3/entry.S
@@ -132,7 +132,6 @@ ENTRY(tlb_protection_violation_store)
mov #1, r5
call_handle_tlbmiss:
- setup_frame_reg
mov.l 1f, r0
mov r5, r8
mov.l @r0, r6
@@ -365,6 +364,8 @@ handle_exception:
mov.l @k2, k2 ! read out vector and keep in k2
handle_exception_special:
+ setup_frame_reg
+
! Setup return address and jump to exception handler
mov.l 7f, r9 ! fetch return address
stc r2_bank, r0 ! k2 (vector)
diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c
index 88d28ec..bd1c497 100644
--- a/arch/sh/kernel/dwarf.c
+++ b/arch/sh/kernel/dwarf.c
@@ -39,10 +39,10 @@ static mempool_t *dwarf_frame_pool;
static struct kmem_cache *dwarf_reg_cachep;
static mempool_t *dwarf_reg_pool;
-static LIST_HEAD(dwarf_cie_list);
+static struct rb_root cie_root;
static DEFINE_SPINLOCK(dwarf_cie_lock);
-static LIST_HEAD(dwarf_fde_list);
+static struct rb_root fde_root;
static DEFINE_SPINLOCK(dwarf_fde_lock);
static struct dwarf_cie *cached_cie;
@@ -301,7 +301,8 @@ static inline int dwarf_entry_len(char *addr, unsigned long *len)
*/
static struct dwarf_cie *dwarf_lookup_cie(unsigned long cie_ptr)
{
- struct dwarf_cie *cie;
+ struct rb_node **rb_node = &cie_root.rb_node;
+ struct dwarf_cie *cie = NULL;
unsigned long flags;
spin_lock_irqsave(&dwarf_cie_lock, flags);
@@ -315,16 +316,24 @@ static struct dwarf_cie *dwarf_lookup_cie(unsigned long cie_ptr)
goto out;
}
- list_for_each_entry(cie, &dwarf_cie_list, link) {
- if (cie->cie_pointer == cie_ptr) {
- cached_cie = cie;
- break;
+ while (*rb_node) {
+ struct dwarf_cie *cie_tmp;
+
+ cie_tmp = rb_entry(*rb_node, struct dwarf_cie, node);
+ BUG_ON(!cie_tmp);
+
+ if (cie_ptr == cie_tmp->cie_pointer) {
+ cie = cie_tmp;
+ cached_cie = cie_tmp;
+ goto out;
+ } else {
+ if (cie_ptr < cie_tmp->cie_pointer)
+ rb_node = &(*rb_node)->rb_left;
+ else
+ rb_node = &(*rb_node)->rb_right;
}
}
- /* Couldn't find the entry in the list. */
- if (&cie->link == &dwarf_cie_list)
- cie = NULL;
out:
spin_unlock_irqrestore(&dwarf_cie_lock, flags);
return cie;
@@ -336,25 +345,34 @@ out:
*/
struct dwarf_fde *dwarf_lookup_fde(unsigned long pc)
{
- struct dwarf_fde *fde;
+ struct rb_node **rb_node = &fde_root.rb_node;
+ struct dwarf_fde *fde = NULL;
unsigned long flags;
spin_lock_irqsave(&dwarf_fde_lock, flags);
- list_for_each_entry(fde, &dwarf_fde_list, link) {
- unsigned long start, end;
+ while (*rb_node) {
+ struct dwarf_fde *fde_tmp;
+ unsigned long tmp_start, tmp_end;
- start = fde->initial_location;
- end = fde->initial_location + fde->address_range;
+ fde_tmp = rb_entry(*rb_node, struct dwarf_fde, node);
+ BUG_ON(!fde_tmp);
- if (pc >= start && pc < end)
- break;
- }
+ tmp_start = fde_tmp->initial_location;
+ tmp_end = fde_tmp->initial_location + fde_tmp->address_range;
- /* Couldn't find the entry in the list. */
- if (&fde->link == &dwarf_fde_list)
- fde = NULL;
+ if (pc < tmp_start) {
+ rb_node = &(*rb_node)->rb_left;
+ } else {
+ if (pc < tmp_end) {
+ fde = fde_tmp;
+ goto out;
+ } else
+ rb_node = &(*rb_node)->rb_right;
+ }
+ }
+out:
spin_unlock_irqrestore(&dwarf_fde_lock, flags);
return fde;
@@ -540,6 +558,8 @@ void dwarf_free_frame(struct dwarf_frame *frame)
mempool_free(frame, dwarf_frame_pool);
}
+extern void ret_from_irq(void);
+
/**
* dwarf_unwind_stack - unwind the stack
*
@@ -550,8 +570,8 @@ void dwarf_free_frame(struct dwarf_frame *frame)
* on the callstack. Each of the lower (older) stack frames are
* linked via the "prev" member.
*/
-struct dwarf_frame * dwarf_unwind_stack(unsigned long pc,
- struct dwarf_frame *prev)
+struct dwarf_frame *dwarf_unwind_stack(unsigned long pc,
+ struct dwarf_frame *prev)
{
struct dwarf_frame *frame;
struct dwarf_cie *cie;
@@ -678,6 +698,24 @@ struct dwarf_frame * dwarf_unwind_stack(unsigned long pc,
addr = frame->cfa + reg->addr;
frame->return_addr = __raw_readl(addr);
+ /*
+ * Ah, the joys of unwinding through interrupts.
+ *
+ * Interrupts are tricky - the DWARF info needs to be _really_
+ * accurate and unfortunately I'm seeing a lot of bogus DWARF
+ * info. For example, I've seen interrupts occur in epilogues
+ * just after the frame pointer (r14) had been restored. The
+ * problem was that the DWARF info claimed that the CFA could be
+ * reached by using the value of the frame pointer before it was
+ * restored.
+ *
+ * So until the compiler can be trusted to produce reliable
+ * DWARF info when it really matters, let's stop unwinding once
+ * we've calculated the function that was interrupted.
+ */
+ if (prev && prev->pc == (unsigned long)ret_from_irq)
+ frame->return_addr = 0;
+
return frame;
bail:
@@ -688,6 +726,8 @@ bail:
static int dwarf_parse_cie(void *entry, void *p, unsigned long len,
unsigned char *end, struct module *mod)
{
+ struct rb_node **rb_node = &cie_root.rb_node;
+ struct rb_node *parent;
struct dwarf_cie *cie;
unsigned long flags;
int count;
@@ -782,11 +822,30 @@ static int dwarf_parse_cie(void *entry, void *p, unsigned long len,
cie->initial_instructions = p;
cie->instructions_end = end;
- cie->mod = mod;
-
/* Add to list */
spin_lock_irqsave(&dwarf_cie_lock, flags);
- list_add_tail(&cie->link, &dwarf_cie_list);
+
+ while (*rb_node) {
+ struct dwarf_cie *cie_tmp;
+
+ cie_tmp = rb_entry(*rb_node, struct dwarf_cie, node);
+
+ parent = *rb_node;
+
+ if (cie->cie_pointer < cie_tmp->cie_pointer)
+ rb_node = &parent->rb_left;
+ else if (cie->cie_pointer >= cie_tmp->cie_pointer)
+ rb_node = &parent->rb_right;
+ else
+ WARN_ON(1);
+ }
+
+ rb_link_node(&cie->node, parent, rb_node);
+ rb_insert_color(&cie->node, &cie_root);
+
+ if (mod != NULL)
+ list_add_tail(&cie->link, &mod->arch.cie_list);
+
spin_unlock_irqrestore(&dwarf_cie_lock, flags);
return 0;
@@ -796,6 +855,8 @@ static int dwarf_parse_fde(void *entry, u32 entry_type,
void *start, unsigned long len,
unsigned char *end, struct module *mod)
{
+ struct rb_node **rb_node = &fde_root.rb_node;
+ struct rb_node *parent;
struct dwarf_fde *fde;
struct dwarf_cie *cie;
unsigned long flags;
@@ -843,11 +904,38 @@ static int dwarf_parse_fde(void *entry, u32 entry_type,
fde->instructions = p;
fde->end = end;
- fde->mod = mod;
-
/* Add to list. */
spin_lock_irqsave(&dwarf_fde_lock, flags);
- list_add_tail(&fde->link, &dwarf_fde_list);
+
+ while (*rb_node) {
+ struct dwarf_fde *fde_tmp;
+ unsigned long tmp_start, tmp_end;
+ unsigned long start, end;
+
+ fde_tmp = rb_entry(*rb_node, struct dwarf_fde, node);
+
+ start = fde->initial_location;
+ end = fde->initial_location + fde->address_range;
+
+ tmp_start = fde_tmp->initial_location;
+ tmp_end = fde_tmp->initial_location + fde_tmp->address_range;
+
+ parent = *rb_node;
+
+ if (start < tmp_start)
+ rb_node = &parent->rb_left;
+ else if (start >= tmp_end)
+ rb_node = &parent->rb_right;
+ else
+ WARN_ON(1);
+ }
+
+ rb_link_node(&fde->node, parent, rb_node);
+ rb_insert_color(&fde->node, &fde_root);
+
+ if (mod != NULL)
+ list_add_tail(&fde->link, &mod->arch.fde_list);
+
spin_unlock_irqrestore(&dwarf_fde_lock, flags);
return 0;
@@ -892,19 +980,29 @@ static struct unwinder dwarf_unwinder = {
static void dwarf_unwinder_cleanup(void)
{
- struct dwarf_cie *cie, *cie_tmp;
- struct dwarf_fde *fde, *fde_tmp;
+ struct rb_node **fde_rb_node = &fde_root.rb_node;
+ struct rb_node **cie_rb_node = &cie_root.rb_node;
/*
* Deallocate all the memory allocated for the DWARF unwinder.
* Traverse all the FDE/CIE lists and remove and free all the
* memory associated with those data structures.
*/
- list_for_each_entry_safe(cie, cie_tmp, &dwarf_cie_list, link)
- kfree(cie);
+ while (*fde_rb_node) {
+ struct dwarf_fde *fde;
- list_for_each_entry_safe(fde, fde_tmp, &dwarf_fde_list, link)
+ fde = rb_entry(*fde_rb_node, struct dwarf_fde, node);
+ rb_erase(*fde_rb_node, &fde_root);
kfree(fde);
+ }
+
+ while (*cie_rb_node) {
+ struct dwarf_cie *cie;
+
+ cie = rb_entry(*cie_rb_node, struct dwarf_cie, node);
+ rb_erase(*cie_rb_node, &cie_root);
+ kfree(cie);
+ }
kmem_cache_destroy(dwarf_reg_cachep);
kmem_cache_destroy(dwarf_frame_cachep);
@@ -1004,6 +1102,8 @@ int module_dwarf_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
/* Did we find the .eh_frame section? */
if (i != hdr->e_shnum) {
+ INIT_LIST_HEAD(&me->arch.cie_list);
+ INIT_LIST_HEAD(&me->arch.fde_list);
err = dwarf_parse_section((char *)start, (char *)end, me);
if (err) {
printk(KERN_WARNING "%s: failed to parse DWARF info\n",
@@ -1024,38 +1124,26 @@ int module_dwarf_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
*/
void module_dwarf_cleanup(struct module *mod)
{
- struct dwarf_fde *fde;
- struct dwarf_cie *cie;
+ struct dwarf_fde *fde, *ftmp;
+ struct dwarf_cie *cie, *ctmp;
unsigned long flags;
spin_lock_irqsave(&dwarf_cie_lock, flags);
-again_cie:
- list_for_each_entry(cie, &dwarf_cie_list, link) {
- if (cie->mod == mod)
- break;
- }
-
- if (&cie->link != &dwarf_cie_list) {
+ list_for_each_entry_safe(cie, ctmp, &mod->arch.cie_list, link) {
list_del(&cie->link);
+ rb_erase(&cie->node, &cie_root);
kfree(cie);
- goto again_cie;
}
spin_unlock_irqrestore(&dwarf_cie_lock, flags);
spin_lock_irqsave(&dwarf_fde_lock, flags);
-again_fde:
- list_for_each_entry(fde, &dwarf_fde_list, link) {
- if (fde->mod == mod)
- break;
- }
-
- if (&fde->link != &dwarf_fde_list) {
+ list_for_each_entry_safe(fde, ftmp, &mod->arch.fde_list, link) {
list_del(&fde->link);
+ rb_erase(&fde->node, &fde_root);
kfree(fde);
- goto again_fde;
}
spin_unlock_irqrestore(&dwarf_fde_lock, flags);
@@ -1074,8 +1162,6 @@ again_fde:
static int __init dwarf_unwinder_init(void)
{
int err;
- INIT_LIST_HEAD(&dwarf_cie_list);
- INIT_LIST_HEAD(&dwarf_fde_list);
dwarf_frame_cachep = kmem_cache_create("dwarf_frames",
sizeof(struct dwarf_frame), 0,
diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S
index f0abd58..2b15ae6 100644
--- a/arch/sh/kernel/entry-common.S
+++ b/arch/sh/kernel/entry-common.S
@@ -70,8 +70,14 @@ ret_from_exception:
CFI_STARTPROC simple
CFI_DEF_CFA r14, 0
CFI_REL_OFFSET 17, 64
- CFI_REL_OFFSET 15, 0
+ CFI_REL_OFFSET 15, 60
CFI_REL_OFFSET 14, 56
+ CFI_REL_OFFSET 13, 52
+ CFI_REL_OFFSET 12, 48
+ CFI_REL_OFFSET 11, 44
+ CFI_REL_OFFSET 10, 40
+ CFI_REL_OFFSET 9, 36
+ CFI_REL_OFFSET 8, 32
preempt_stop()
ENTRY(ret_from_irq)
!
generated by cgit v1.1 at 2024-12-27 08:29:03 +0000