summaryrefslogtreecommitdiffstats
path: root/arch/arc/kernel/unwind.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arc/kernel/unwind.c')
-rw-r--r--arch/arc/kernel/unwind.c90
1 files changed, 39 insertions, 51 deletions
diff --git a/arch/arc/kernel/unwind.c b/arch/arc/kernel/unwind.c
index 93c6ea52b671..cf2828ab0905 100644
--- a/arch/arc/kernel/unwind.c
+++ b/arch/arc/kernel/unwind.c
@@ -170,6 +170,23 @@ static struct unwind_table *find_table(unsigned long pc)
static unsigned long read_pointer(const u8 **pLoc,
const void *end, signed ptrType);
+static void init_unwind_hdr(struct unwind_table *table,
+ void *(*alloc) (unsigned long));
+
+/*
+ * wrappers for header alloc (vs. calling one vs. other at call site)
+ * to elide section mismatches warnings
+ */
+static void *__init unw_hdr_alloc_early(unsigned long sz)
+{
+ return __alloc_bootmem_nopanic(sz, sizeof(unsigned int),
+ MAX_DMA_ADDRESS);
+}
+
+static void *unw_hdr_alloc(unsigned long sz)
+{
+ return kmalloc(sz, GFP_KERNEL);
+}
static void init_unwind_table(struct unwind_table *table, const char *name,
const void *core_start, unsigned long core_size,
@@ -209,6 +226,8 @@ void __init arc_unwind_init(void)
__start_unwind, __end_unwind - __start_unwind,
NULL, 0);
/*__start_unwind_hdr, __end_unwind_hdr - __start_unwind_hdr);*/
+
+ init_unwind_hdr(&root_table, unw_hdr_alloc_early);
}
static const u32 bad_cie, not_fde;
@@ -241,8 +260,8 @@ static void swap_eh_frame_hdr_table_entries(void *p1, void *p2, int size)
e2->fde = v;
}
-static void __init setup_unwind_table(struct unwind_table *table,
- void *(*alloc) (unsigned long))
+static void init_unwind_hdr(struct unwind_table *table,
+ void *(*alloc) (unsigned long))
{
const u8 *ptr;
unsigned long tableSize = table->size, hdrSize;
@@ -274,13 +293,13 @@ static void __init setup_unwind_table(struct unwind_table *table,
const u32 *cie = cie_for_fde(fde, table);
signed ptrType;
- if (cie == &not_fde)
+ if (cie == &not_fde) /* only process FDE here */
continue;
if (cie == NULL || cie == &bad_cie)
- return;
+ continue; /* say FDE->CIE.version != 1 */
ptrType = fde_pointer_type(cie);
if (ptrType < 0)
- return;
+ continue;
ptr = (const u8 *)(fde + 2);
if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde,
@@ -300,9 +319,11 @@ static void __init setup_unwind_table(struct unwind_table *table,
hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int)
+ 2 * n * sizeof(unsigned long);
+
header = alloc(hdrSize);
if (!header)
return;
+
header->version = 1;
header->eh_frame_ptr_enc = DW_EH_PE_abs | DW_EH_PE_native;
header->fde_count_enc = DW_EH_PE_abs | DW_EH_PE_data4;
@@ -322,6 +343,10 @@ static void __init setup_unwind_table(struct unwind_table *table,
if (fde[1] == 0xffffffff)
continue; /* this is a CIE */
+
+ if (*(u8 *)(cie + 2) != 1)
+ continue; /* FDE->CIE.version not supported */
+
ptr = (const u8 *)(fde + 2);
header->table[n].start = read_pointer(&ptr,
(const u8 *)(fde + 1) +
@@ -342,18 +367,6 @@ static void __init setup_unwind_table(struct unwind_table *table,
table->header = (const void *)header;
}
-static void *__init balloc(unsigned long sz)
-{
- return __alloc_bootmem_nopanic(sz,
- sizeof(unsigned int),
- __pa(MAX_DMA_ADDRESS));
-}
-
-void __init arc_unwind_setup(void)
-{
- setup_unwind_table(&root_table, balloc);
-}
-
#ifdef CONFIG_MODULES
static struct unwind_table *last_table;
@@ -377,6 +390,8 @@ void *unwind_add_table(struct module *module, const void *table_start,
table_start, table_size,
NULL, 0);
+ init_unwind_hdr(table, unw_hdr_alloc);
+
#ifdef UNWIND_DEBUG
unw_debug("Table added for [%s] %lx %lx\n",
module->name, table->core.pc, table->core.range);
@@ -439,6 +454,7 @@ void unwind_remove_table(void *handle, int init_only)
info.init_only = init_only;
unlink_table(&info); /* XXX: SMP */
+ kfree(table->header);
kfree(table);
}
@@ -507,7 +523,8 @@ static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table)
if (*cie <= sizeof(*cie) + 4 || *cie >= fde[1] - sizeof(*fde)
|| (*cie & (sizeof(*cie) - 1))
- || (cie[1] != 0xffffffff))
+ || (cie[1] != 0xffffffff)
+ || ( *(u8 *)(cie + 2) != 1)) /* version 1 supported */
return NULL; /* this is not a (valid) CIE */
return cie;
}
@@ -986,42 +1003,13 @@ int arc_unwind(struct unwind_frame_info *frame)
(const u8 *)(fde +
1) +
*fde, ptrType);
- if (pc >= endLoc)
+ if (pc >= endLoc) {
fde = NULL;
- } else
- fde = NULL;
- }
- if (fde == NULL) {
- for (fde = table->address, tableSize = table->size;
- cie = NULL, tableSize > sizeof(*fde)
- && tableSize - sizeof(*fde) >= *fde;
- tableSize -= sizeof(*fde) + *fde,
- fde += 1 + *fde / sizeof(*fde)) {
- cie = cie_for_fde(fde, table);
- if (cie == &bad_cie) {
cie = NULL;
- break;
}
- if (cie == NULL
- || cie == &not_fde
- || (ptrType = fde_pointer_type(cie)) < 0)
- continue;
- ptr = (const u8 *)(fde + 2);
- startLoc = read_pointer(&ptr,
- (const u8 *)(fde + 1) +
- *fde, ptrType);
- if (!startLoc)
- continue;
- if (!(ptrType & DW_EH_PE_indirect))
- ptrType &=
- DW_EH_PE_FORM | DW_EH_PE_signed;
- endLoc =
- startLoc + read_pointer(&ptr,
- (const u8 *)(fde +
- 1) +
- *fde, ptrType);
- if (pc >= startLoc && pc < endLoc)
- break;
+ } else {
+ fde = NULL;
+ cie = NULL;
}
}
}