[PATCH] powerpc vDSO: use VM_ALWAYSDUMP

[sfrench/cifs-2.6.git] / arch / powerpc / kernel / vdso.c

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 1a7e19cdab39c37a9f0e759a6b2177744ef3a967..ae0ede19879ded35d9dba71b760e887aff75e020 100644 (file)
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -36,6 +36,8 @@
 #include <asm/vdso.h>
 #include <asm/vdso_datapage.h>
 
+#include "setup.h"
+
 #undef DEBUG
 
 #ifdef DEBUG
@@ -262,7 +264,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
 
 
        /* Allocate a VMA structure and fill it up */
-       vma = kmem_cache_zalloc(vm_area_cachep, SLAB_KERNEL);
+       vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
        if (vma == NULL) {
                rc = -ENOMEM;
                goto fail_mmapsem;
@@ -282,6 +284,13 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
         * pages though
         */
        vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC;
+       /*
+        * Make sure the vDSO gets into every core dump.
+        * Dumping its contents makes post-mortem fully interpretable later
+        * without matching up the same kernel and hardware config to see
+        * what PC values meant.
+        */
+       vma->vm_flags |= VM_ALWAYSDUMP;
        vma->vm_flags |= mm->def_flags;
        vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
        vma->vm_ops = &vdso_vmops;
@@ -586,6 +595,43 @@ static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
        return 0;
 }
 
+
+static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
+                                     struct lib64_elfinfo *v64)
+{
+       void *start32;
+       unsigned long size32;
+
+#ifdef CONFIG_PPC64
+       void *start64;
+       unsigned long size64;
+
+       start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
+       if (start64)
+               do_feature_fixups(cur_cpu_spec->cpu_features,
+                                 start64, start64 + size64);
+
+       start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
+       if (start64)
+               do_feature_fixups(powerpc_firmware_features,
+                                 start64, start64 + size64);
+#endif /* CONFIG_PPC64 */
+
+       start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
+       if (start32)
+               do_feature_fixups(cur_cpu_spec->cpu_features,
+                                 start32, start32 + size32);
+
+#ifdef CONFIG_PPC64
+       start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
+       if (start32)
+               do_feature_fixups(powerpc_firmware_features,
+                                 start32, start32 + size32);
+#endif /* CONFIG_PPC64 */
+
+       return 0;
+}
+
 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
                                       struct lib64_elfinfo *v64)
 {
@@ -634,6 +680,9 @@ static __init int vdso_setup(void)
        if (vdso_fixup_datapage(&v32, &v64))
                return -1;
 
+       if (vdso_fixup_features(&v32, &v64))
+               return -1;
+
        if (vdso_fixup_alt_funcs(&v32, &v64))
                return -1;
 
@@ -714,6 +763,7 @@ void __init vdso_init(void)
         * Setup the syscall map in the vDOS
         */
        vdso_setup_syscall_map();
+
        /*
         * Initialize the vDSO images in memory, that is do necessary
         * fixups of vDSO symbols, locate trampolines, etc...