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Diffstat (limited to 'arch/sparc/kernel/sys_sparc_64.c')
-rw-r--r--arch/sparc/kernel/sys_sparc_64.c155
1 files changed, 38 insertions, 117 deletions
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index 11c6c9603e7..97309c0ec53 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -75,7 +75,7 @@ static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
* the spitfire/niagara VA-hole.
*/
-static inline unsigned long COLOUR_ALIGN(unsigned long addr,
+static inline unsigned long COLOR_ALIGN(unsigned long addr,
unsigned long pgoff)
{
unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
@@ -84,24 +84,13 @@ static inline unsigned long COLOUR_ALIGN(unsigned long addr,
return base + off;
}
-static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
- unsigned long pgoff)
-{
- unsigned long base = addr & ~(SHMLBA-1);
- unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
-
- if (base + off <= addr)
- return base + off;
- return base - off;
-}
-
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct * vma;
unsigned long task_size = TASK_SIZE;
- unsigned long start_addr;
int do_color_align;
+ struct vm_unmapped_area_info info;
if (flags & MAP_FIXED) {
/* We do not accept a shared mapping if it would violate
@@ -124,7 +113,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
if (addr) {
if (do_color_align)
- addr = COLOUR_ALIGN(addr, pgoff);
+ addr = COLOR_ALIGN(addr, pgoff);
else
addr = PAGE_ALIGN(addr);
@@ -134,50 +123,22 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
return addr;
}
- if (len > mm->cached_hole_size) {
- start_addr = addr = mm->free_area_cache;
- } else {
- start_addr = addr = TASK_UNMAPPED_BASE;
- mm->cached_hole_size = 0;
- }
-
- task_size -= len;
-
-full_search:
- if (do_color_align)
- addr = COLOUR_ALIGN(addr, pgoff);
- else
- addr = PAGE_ALIGN(addr);
+ info.flags = 0;
+ info.length = len;
+ info.low_limit = TASK_UNMAPPED_BASE;
+ info.high_limit = min(task_size, VA_EXCLUDE_START);
+ info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
+ info.align_offset = pgoff << PAGE_SHIFT;
+ addr = vm_unmapped_area(&info);
- for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
- /* At this point: (!vma || addr < vma->vm_end). */
- if (addr < VA_EXCLUDE_START &&
- (addr + len) >= VA_EXCLUDE_START) {
- addr = VA_EXCLUDE_END;
- vma = find_vma(mm, VA_EXCLUDE_END);
- }
- if (unlikely(task_size < addr)) {
- if (start_addr != TASK_UNMAPPED_BASE) {
- start_addr = addr = TASK_UNMAPPED_BASE;
- mm->cached_hole_size = 0;
- goto full_search;
- }
- return -ENOMEM;
- }
- if (likely(!vma || addr + len <= vma->vm_start)) {
- /*
- * Remember the place where we stopped the search:
- */
- mm->free_area_cache = addr + len;
- return addr;
- }
- if (addr + mm->cached_hole_size < vma->vm_start)
- mm->cached_hole_size = vma->vm_start - addr;
-
- addr = vma->vm_end;
- if (do_color_align)
- addr = COLOUR_ALIGN(addr, pgoff);
+ if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
+ VM_BUG_ON(addr != -ENOMEM);
+ info.low_limit = VA_EXCLUDE_END;
+ info.high_limit = task_size;
+ addr = vm_unmapped_area(&info);
}
+
+ return addr;
}
unsigned long
@@ -190,6 +151,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
unsigned long task_size = STACK_TOP32;
unsigned long addr = addr0;
int do_color_align;
+ struct vm_unmapped_area_info info;
/* This should only ever run for 32-bit processes. */
BUG_ON(!test_thread_flag(TIF_32BIT));
@@ -214,7 +176,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
/* requesting a specific address */
if (addr) {
if (do_color_align)
- addr = COLOUR_ALIGN(addr, pgoff);
+ addr = COLOR_ALIGN(addr, pgoff);
else
addr = PAGE_ALIGN(addr);
@@ -224,73 +186,27 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
return addr;
}
- /* check if free_area_cache is useful for us */
- if (len <= mm->cached_hole_size) {
- mm->cached_hole_size = 0;
- mm->free_area_cache = mm->mmap_base;
- }
+ info.flags = VM_UNMAPPED_AREA_TOPDOWN;
+ info.length = len;
+ info.low_limit = PAGE_SIZE;
+ info.high_limit = mm->mmap_base;
+ info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
+ info.align_offset = pgoff << PAGE_SHIFT;
+ addr = vm_unmapped_area(&info);
- /* either no address requested or can't fit in requested address hole */
- addr = mm->free_area_cache;
- if (do_color_align) {
- unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
-
- addr = base + len;
- }
-
- /* make sure it can fit in the remaining address space */
- if (likely(addr > len)) {
- vma = find_vma(mm, addr-len);
- if (!vma || addr <= vma->vm_start) {
- /* remember the address as a hint for next time */
- return (mm->free_area_cache = addr-len);
- }
- }
-
- if (unlikely(mm->mmap_base < len))
- goto bottomup;
-
- addr = mm->mmap_base-len;
- if (do_color_align)
- addr = COLOUR_ALIGN_DOWN(addr, pgoff);
-
- do {
- /*
- * Lookup failure means no vma is above this address,
- * else if new region fits below vma->vm_start,
- * return with success:
- */
- vma = find_vma(mm, addr);
- if (likely(!vma || addr+len <= vma->vm_start)) {
- /* remember the address as a hint for next time */
- return (mm->free_area_cache = addr);
- }
-
- /* remember the largest hole we saw so far */
- if (addr + mm->cached_hole_size < vma->vm_start)
- mm->cached_hole_size = vma->vm_start - addr;
-
- /* try just below the current vma->vm_start */
- addr = vma->vm_start-len;
- if (do_color_align)
- addr = COLOUR_ALIGN_DOWN(addr, pgoff);
- } while (likely(len < vma->vm_start));
-
-bottomup:
/*
* A failed mmap() very likely causes application failure,
* so fall back to the bottom-up function here. This scenario
* can happen with large stack limits and large mmap()
* allocations.
*/
- mm->cached_hole_size = ~0UL;
- mm->free_area_cache = TASK_UNMAPPED_BASE;
- addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
- /*
- * Restore the topdown base:
- */
- mm->free_area_cache = mm->mmap_base;
- mm->cached_hole_size = ~0UL;
+ if (addr & ~PAGE_MASK) {
+ VM_BUG_ON(addr != -ENOMEM);
+ info.flags = 0;
+ info.low_limit = TASK_UNMAPPED_BASE;
+ info.high_limit = STACK_TOP32;
+ addr = vm_unmapped_area(&info);
+ }
return addr;
}
@@ -751,3 +667,8 @@ int kernel_execve(const char *filename,
: "cc");
return __res;
}
+
+asmlinkage long sys_kern_features(void)
+{
+ return KERN_FEATURE_MIXED_MODE_STACK;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 01:22:11 +0000