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Allocate heap with the size determined via svcGetInfo by default. Updated heap comments.

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yellows8 2018-02-05 22:21:44 -05:00
parent 356a06fb94
commit 4137f9aefe
1 changed files with 21 additions and 7 deletions
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28
nx/source/runtime/init.c
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@ -16,8 +16,8 @@ void argvSetup(void);
extern u32 __nx_applet_type;
// Must be a multiple of 0x2000000.
__attribute__((weak)) size_t __nx_heap_size = 0x2000000*16;
// Must be a multiple of 0x200000.
__attribute__((weak)) size_t __nx_heap_size = 0;
/*
There are three ways of allocating heap:
@ -25,7 +25,9 @@ __attribute__((weak)) size_t __nx_heap_size = 0x2000000*16;
- Normal syscall:
Allocates heap using |svcSetHeapSize|. The size is provided by a weak symbol
called |__nx_heap_size|.
called |__nx_heap_size|. With the default 0 value, the size is automatically
determined with svcGetInfo. If running under a process where heap was already
allocated with svcSetHeapSize, __nx_heap_size should be set manually.
- Heap override:
@ -39,22 +41,34 @@ __attribute__((weak)) size_t __nx_heap_size = 0x2000000*16;
different heap. In this case, the global variables |fake_heap_start|
and |fake_heap_end| needs to be set appropriately.
A custom override be used to implement an "inner heap" located in the .bss
A custom override can be used to implement an "inner heap" located in the .bss
segment of a process, for example.
*/
void __attribute__((weak)) __libnx_initheap(void)
{
void* addr;
size_t size;
size_t size = 0;
size_t mem_available = 0, mem_used = 0;
if (envHasHeapOverride()) {
addr = envGetHeapOverrideAddr();
size = envGetHeapOverrideSize();
}
else {
Result rc = svcSetHeapSize(&addr, __nx_heap_size);
size = __nx_heap_size;
if (__nx_heap_size==0) {
svcGetInfo(&mem_available, 6, CUR_PROCESS_HANDLE, 0);
svcGetInfo(&mem_used, 7, CUR_PROCESS_HANDLE, 0);
if (mem_available > mem_used+0x200000)
size = (mem_available - mem_used - 0x200000) & ~0x1FFFFF;
if (size==0)
size = 0x2000000*16;
}
else {
size = __nx_heap_size;
}
Result rc = svcSetHeapSize(&addr, size);
if (R_FAILED(rc))
fatalSimple(MAKERESULT(Module_Libnx, LibnxError_HeapAllocFailed));