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authorRavi Bangoria <ravi.bangoria@linux.vnet.ibm.com>2017-07-14 13:26:27 +0530
committerAlan Modra <amodra@gmail.com>2017-07-14 22:51:01 +0930
commit0f6329bd7fcc8952aed5a386617d12529771415d (patch)
treed65ecc2014d5890e847a89242b84a866901d9ae2 /opcodes
parent86038de0d810f8639d22573921d2589a99829b36 (diff)
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binutils/objdump: Fix disassemble for huge elf sections
When elf section size is beyond unsigned int max value, objdump fails to disassemble from that section. Ex on PowerPC, $ objdump -h /proc/kcore Idx Name Size VMA 4 load2 100000000 c000000000000000 Here, size of load2 section is 0x100000000. Also note that, 0xc00.... address range is kernel space for PowerPC. Now let's try to disassemble do_sys_open() using /proc/kcore. $ cat /proc/kallsyms | grep -A1 -w do_sys_open c00000000036c000 T do_sys_open c00000000036c2d0 T SyS_open Before patch: $ objdump -d --start-address=0xc00000000036c000 --stop-address=0xc00000000036c2d0 /proc/kcore /proc/kcore: file format elf64-powerpcle Disassembly of section load2: c00000000036c000 <load2+0x36c000>: c00000000036c000: Address 0xc00000000036c000 is out of bounds. Fix this by changing type of 'buffer_length' from unsigned int to size_t. After patch: $ objdump -d --start-address=0xc00000000036c000 --stop-address=0xc00000000036c2d0 /proc/kcore /proc/kcore: file format elf64-powerpcle Disassembly of section load2: c00000000036c000 <load2+0x36c000>: c00000000036c000: fc 00 4c 3c addis r2,r12,252 c00000000036c004: 00 53 42 38 addi r2,r2,21248 c00000000036c008: a6 02 08 7c mflr r0 include/ * dis-asm.h (struct disassemble_info): Change type of buffer_length field to size_t. opcodes/ * dis-buf.c (buffer_read_memory): Change type of end_addr_offset, max_addr_offset and octets variables to size_t.
Diffstat (limited to 'opcodes')
-rw-r--r--opcodes/ChangeLog5
-rw-r--r--opcodes/dis-buf.c6
2 files changed, 8 insertions, 3 deletions
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 855ac35..caeeee7 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,8 @@
+2017-07-14 Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
+
+ * dis-buf.c (buffer_read_memory): Change type of end_addr_offset,
+ max_addr_offset and octets variables to size_t.
+
2017-07-12 Alan Modra <amodra@gmail.com>
* po/da.po: Update from translationproject.org/latest/opcodes/.
diff --git a/opcodes/dis-buf.c b/opcodes/dis-buf.c
index 061bc44..fd495bb 100644
--- a/opcodes/dis-buf.c
+++ b/opcodes/dis-buf.c
@@ -32,9 +32,9 @@ buffer_read_memory (bfd_vma memaddr,
struct disassemble_info *info)
{
unsigned int opb = info->octets_per_byte;
- unsigned int end_addr_offset = length / opb;
- unsigned int max_addr_offset = info->buffer_length / opb;
- unsigned int octets = (memaddr - info->buffer_vma) * opb;
+ size_t end_addr_offset = length / opb;
+ size_t max_addr_offset = info->buffer_length / opb;
+ size_t octets = (memaddr - info->buffer_vma) * opb;
if (memaddr < info->buffer_vma
|| memaddr - info->buffer_vma > max_addr_offset