summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--arch/x86/mm/cpu_entry_area.c10
-rw-r--r--fs/proc/kcore.c7
-rw-r--r--include/linux/kcore.h13
3 files changed, 28 insertions, 2 deletions
diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c
index fab49fd5190f..076ebdce9bd4 100644
--- a/arch/x86/mm/cpu_entry_area.c
+++ b/arch/x86/mm/cpu_entry_area.c
@@ -3,6 +3,7 @@
#include <linux/spinlock.h>
#include <linux/percpu.h>
#include <linux/kallsyms.h>
+#include <linux/kcore.h>
#include <asm/cpu_entry_area.h>
#include <asm/pgtable.h>
@@ -14,6 +15,7 @@ static DEFINE_PER_CPU_PAGE_ALIGNED(struct entry_stack_page, entry_stack_storage)
#ifdef CONFIG_X86_64
static DEFINE_PER_CPU_PAGE_ALIGNED(char, exception_stacks
[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ]);
+static DEFINE_PER_CPU(struct kcore_list, kcore_entry_trampoline);
#endif
struct cpu_entry_area *get_cpu_entry_area(int cpu)
@@ -147,6 +149,14 @@ static void __init setup_cpu_entry_area(int cpu)
cea_set_pte(&get_cpu_entry_area(cpu)->entry_trampoline,
__pa_symbol(_entry_trampoline), PAGE_KERNEL_RX);
+ /*
+ * The cpu_entry_area alias addresses are not in the kernel binary
+ * so they do not show up in /proc/kcore normally. This adds entries
+ * for them manually.
+ */
+ kclist_add_remap(&per_cpu(kcore_entry_trampoline, cpu),
+ _entry_trampoline,
+ &get_cpu_entry_area(cpu)->entry_trampoline, PAGE_SIZE);
#endif
percpu_setup_debug_store(cpu);
}
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index e64ecb9f2720..00282f134336 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -383,8 +383,11 @@ static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff)
phdr->p_type = PT_LOAD;
phdr->p_flags = PF_R|PF_W|PF_X;
phdr->p_offset = kc_vaddr_to_offset(m->addr) + dataoff;
- phdr->p_vaddr = (size_t)m->addr;
- if (m->type == KCORE_RAM || m->type == KCORE_TEXT)
+ if (m->type == KCORE_REMAP)
+ phdr->p_vaddr = (size_t)m->vaddr;
+ else
+ phdr->p_vaddr = (size_t)m->addr;
+ if (m->type == KCORE_RAM || m->type == KCORE_TEXT || m->type == KCORE_REMAP)
phdr->p_paddr = __pa(m->addr);
else
phdr->p_paddr = (elf_addr_t)-1;
diff --git a/include/linux/kcore.h b/include/linux/kcore.h
index 8de55e4b5ee9..bc088ef96358 100644
--- a/include/linux/kcore.h
+++ b/include/linux/kcore.h
@@ -12,11 +12,13 @@ enum kcore_type {
KCORE_VMEMMAP,
KCORE_USER,
KCORE_OTHER,
+ KCORE_REMAP,
};
struct kcore_list {
struct list_head list;
unsigned long addr;
+ unsigned long vaddr;
size_t size;
int type;
};
@@ -36,11 +38,22 @@ struct vmcoredd_node {
#ifdef CONFIG_PROC_KCORE
extern void kclist_add(struct kcore_list *, void *, size_t, int type);
+static inline
+void kclist_add_remap(struct kcore_list *m, void *addr, void *vaddr, size_t sz)
+{
+ m->vaddr = (unsigned long)vaddr;
+ kclist_add(m, addr, sz, KCORE_REMAP);
+}
#else
static inline
void kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
{
}
+
+static inline
+void kclist_add_remap(struct kcore_list *m, void *addr, void *vaddr, size_t sz)
+{
+}
#endif
#endif /* _LINUX_KCORE_H */