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# DP: Fix statically linked gccgo binaries on AArch64.
Index: b/src/libgo/runtime/malloc.goc
===================================================================
--- a/src/libgo/runtime/malloc.goc
+++ b/src/libgo/runtime/malloc.goc
@@ -339,12 +339,14 @@ runtime_mallocinit(void)
extern byte _end[];
byte *want;
uintptr limit;
+ bool is_reserved;
runtime_sizeof_C_MStats = sizeof(MStats);
p = nil;
arena_size = 0;
bitmap_size = 0;
+ is_reserved = false;
// for 64-bit build
USED(p);
@@ -389,7 +391,8 @@ runtime_mallocinit(void)
// If this fails we fall back to the 32 bit memory mechanism
arena_size = MaxMem;
bitmap_size = arena_size / (sizeof(void*)*8/4);
- p = runtime_SysReserve((void*)(0x00c0ULL<<32), bitmap_size + arena_size);
+ p = runtime_SysReserve((void*)(0x00c0ULL<<32), bitmap_size + arena_size, false);
+ is_reserved = false;
}
if (p == nil) {
// On a 32-bit machine, we can't typically get away
@@ -428,7 +431,8 @@ runtime_mallocinit(void)
want = (byte*)(((uintptr)_end + (1<<18) + (1<<20) - 1)&~((1<<20)-1));
if(0xffffffff - (uintptr)want <= bitmap_size + arena_size)
want = 0;
- p = runtime_SysReserve(want, bitmap_size + arena_size);
+ p = runtime_SysReserve(want, bitmap_size + arena_size, true);
+ is_reserved = true;
if(p == nil)
runtime_throw("runtime: cannot reserve arena virtual address space");
if((uintptr)p & (((uintptr)1<<PageShift)-1))
@@ -441,6 +445,7 @@ runtime_mallocinit(void)
runtime_mheap->arena_start = p + bitmap_size;
runtime_mheap->arena_used = runtime_mheap->arena_start;
runtime_mheap->arena_end = runtime_mheap->arena_start + arena_size;
+ runtime_mheap->is_reserved = is_reserved;
// Initialize the rest of the allocator.
runtime_MHeap_Init(runtime_mheap, runtime_SysAlloc);
@@ -462,12 +467,15 @@ runtime_MHeap_SysAlloc(MHeap *h, uintptr
byte *new_end;
uintptr needed;
+ if (!h->is_reserved) {
+ runtime_throw("runtime: cannot allocate memory");
+ }
needed = (uintptr)h->arena_used + n - (uintptr)h->arena_end;
// Round wanted arena size to a multiple of 256MB.
needed = (needed + (256<<20) - 1) & ~((256<<20)-1);
new_end = h->arena_end + needed;
if(new_end <= h->arena_start + MaxArena32) {
- p = runtime_SysReserve(h->arena_end, new_end - h->arena_end);
+ p = runtime_SysReserve(h->arena_end, new_end - h->arena_end, true);
if(p == h->arena_end)
h->arena_end = new_end;
}
@@ -475,7 +483,7 @@ runtime_MHeap_SysAlloc(MHeap *h, uintptr
if(n <= (uintptr)(h->arena_end - h->arena_used)) {
// Keep taking from our reservation.
p = h->arena_used;
- runtime_SysMap(p, n);
+ runtime_SysMap(p, n, h->is_reserved);
h->arena_used += n;
runtime_MHeap_MapBits(h);
if(raceenabled)
Index: b/src/libgo/runtime/malloc.h
===================================================================
--- a/src/libgo/runtime/malloc.h
+++ b/src/libgo/runtime/malloc.h
@@ -177,8 +177,8 @@ struct MLink
void* runtime_SysAlloc(uintptr nbytes);
void runtime_SysFree(void *v, uintptr nbytes);
void runtime_SysUnused(void *v, uintptr nbytes);
-void runtime_SysMap(void *v, uintptr nbytes);
-void* runtime_SysReserve(void *v, uintptr nbytes);
+void runtime_SysMap(void *v, uintptr nbytes, bool do_reserve);
+void* runtime_SysReserve(void *v, uintptr nbytes, bool is_reserved);
// FixAlloc is a simple free-list allocator for fixed size objects.
// Malloc uses a FixAlloc wrapped around SysAlloc to manages its
@@ -434,6 +434,7 @@ struct MHeap
FixAlloc spanalloc; // allocator for Span*
FixAlloc cachealloc; // allocator for MCache*
+ bool is_reserved; // is the all the address space for this heap actually reserved by us?
};
extern MHeap *runtime_mheap;
Index: b/src/libgo/runtime/mem.c
===================================================================
--- a/src/libgo/runtime/mem.c
+++ b/src/libgo/runtime/mem.c
@@ -110,7 +110,7 @@ runtime_SysFree(void *v, uintptr n)
}
void*
-runtime_SysReserve(void *v, uintptr n)
+runtime_SysReserve(void *v, uintptr n, bool do_reserve)
{
int fd = -1;
void *p;
@@ -130,7 +130,7 @@ runtime_SysReserve(void *v, uintptr n)
// much address space. Instead, assume that the reservation is okay
// if we can reserve at least 64K and check the assumption in SysMap.
// Only user-mode Linux (UML) rejects these requests.
- if(sizeof(void*) == 8 && (uintptr)v >= 0xffffffffU) {
+ if(!do_reserve) {
p = mmap_fixed(v, 64<<10, PROT_NONE, MAP_ANON|MAP_PRIVATE, fd, 0);
if (p != v)
return nil;
@@ -149,7 +149,7 @@ runtime_SysReserve(void *v, uintptr n)
}
void
-runtime_SysMap(void *v, uintptr n)
+runtime_SysMap(void *v, uintptr n, bool is_reserved)
{
void *p;
int fd = -1;
@@ -168,7 +168,7 @@ runtime_SysMap(void *v, uintptr n)
#endif
// On 64-bit, we don't actually have v reserved, so tread carefully.
- if(sizeof(void*) == 8 && (uintptr)v >= 0xffffffffU) {
+ if(!is_reserved) {
p = mmap_fixed(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, fd, 0);
if(p == MAP_FAILED && errno == ENOMEM)
runtime_throw("runtime: out of memory");
Index: b/src/libgo/runtime/mgc0.c
===================================================================
--- a/src/libgo/runtime/mgc0.c
+++ b/src/libgo/runtime/mgc0.c
@@ -2479,6 +2479,6 @@ runtime_MHeap_MapBits(MHeap *h)
page_size = getpagesize();
n = (n+page_size-1) & ~(page_size-1);
- runtime_SysMap(h->arena_start - n, n - h->bitmap_mapped);
+ runtime_SysMap(h->arena_start - n, n - h->bitmap_mapped, h->is_reserved);
h->bitmap_mapped = n;
}
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