aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-21 15:57:50 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-21 15:57:50 -0700
commit9738cbe32192919356397f1e24f9b26e1f574fbb (patch)
tree75caa6d21a8b68a36285ee787095fb05b14627fb
parent58229a18994215bbfe0bcd1c99d2e039f30b076b (diff)
parent05dc16d6a175139a5872d08db56ee277ec90df5b (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6
* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6: [PARISC] unwinder improvements [PARISC] Fix unwinder on 64-bit kernels [PARISC] Handle wrapping in expand_upwards() [PARISC] stop lcd driver from stripping initial whitespace
-rw-r--r--arch/parisc/kernel/unwind.c43
-rw-r--r--drivers/parisc/led.c6
-rw-r--r--include/asm-parisc/system.h1
-rw-r--r--mm/mmap.c9
4 files changed, 43 insertions, 16 deletions
diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index e70f57e2764..322167737de 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -16,6 +16,8 @@
#include <asm/uaccess.h>
#include <asm/assembly.h>
+#include <asm/asm-offsets.h>
+#include <asm/ptrace.h>
#include <asm/unwind.h>
@@ -26,6 +28,8 @@
#define dbg(x...)
#endif
+#define KERNEL_START (KERNEL_BINARY_TEXT_START - 0x1000)
+
extern struct unwind_table_entry __start___unwind[];
extern struct unwind_table_entry __stop___unwind[];
@@ -197,6 +201,29 @@ static int unwind_init(void)
return 0;
}
+#ifdef CONFIG_64BIT
+#define get_func_addr(fptr) fptr[2]
+#else
+#define get_func_addr(fptr) fptr[0]
+#endif
+
+static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int frame_size)
+{
+ void handle_interruption(int, struct pt_regs *);
+ static unsigned long *hi = (unsigned long)&handle_interruption;
+
+ if (pc == get_func_addr(hi)) {
+ struct pt_regs *regs = (struct pt_regs *)(info->sp - frame_size - PT_SZ_ALGN);
+ dbg("Unwinding through handle_interruption()\n");
+ info->prev_sp = regs->gr[30];
+ info->prev_ip = regs->iaoq[0];
+
+ return 1;
+ }
+
+ return 0;
+}
+
static void unwind_frame_regs(struct unwind_frame_info *info)
{
const struct unwind_table_entry *e;
@@ -310,13 +337,15 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
}
}
- info->prev_sp = info->sp - frame_size;
- if (e->Millicode)
- info->rp = info->r31;
- else if (rpoffset)
- info->rp = *(unsigned long *)(info->prev_sp - rpoffset);
- info->prev_ip = info->rp;
- info->rp = 0;
+ if (!unwind_special(info, e->region_start, frame_size)) {
+ info->prev_sp = info->sp - frame_size;
+ if (e->Millicode)
+ info->rp = info->r31;
+ else if (rpoffset)
+ info->rp = *(unsigned long *)(info->prev_sp - rpoffset);
+ info->prev_ip = info->rp;
+ info->rp = 0;
+ }
dbg("analyzing func @ %lx, setting prev_sp=%lx "
"prev_ip=%lx npc=%lx\n", info->ip, info->prev_sp,
diff --git a/drivers/parisc/led.c b/drivers/parisc/led.c
index 98be2880757..e5d7ed92d6f 100644
--- a/drivers/parisc/led.c
+++ b/drivers/parisc/led.c
@@ -195,12 +195,6 @@ static int led_proc_write(struct file *file, const char *buf,
cur = lbuf;
- /* skip initial spaces */
- while (*cur && isspace(*cur))
- {
- cur++;
- }
-
switch ((long)data)
{
case LED_NOLCD:
diff --git a/include/asm-parisc/system.h b/include/asm-parisc/system.h
index 7e9afa720d4..21fbfc5afd0 100644
--- a/include/asm-parisc/system.h
+++ b/include/asm-parisc/system.h
@@ -188,7 +188,6 @@ static inline void set_eiem(unsigned long val)
# define __lock_aligned __attribute__((__section__(".data.lock_aligned")))
#endif
-#define KERNEL_START (0x10100000 - 0x1000)
#define arch_align_stack(x) (x)
#endif
diff --git a/mm/mmap.c b/mm/mmap.c
index 68b9ad2ef1d..906ed402f7c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1536,9 +1536,14 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
* vma->vm_start/vm_end cannot change under us because the caller
* is required to hold the mmap_sem in read mode. We need the
* anon_vma lock to serialize against concurrent expand_stacks.
+ * Also guard against wrapping around to address 0.
*/
- address += 4 + PAGE_SIZE - 1;
- address &= PAGE_MASK;
+ if (address < PAGE_ALIGN(address+4))
+ address = PAGE_ALIGN(address+4);
+ else {
+ anon_vma_unlock(vma);
+ return -ENOMEM;
+ }
error = 0;
/* Somebody else might have raced and expanded it already */