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ELF: make sure stack is always 16 byte aligned

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Matheus
2022-08-28 23:52:17 -03:00
parent 3066fdbb4f
commit 13a6618041
1 changed files with 6 additions and 2 deletions
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src/sys/sched/elf.c
+5 -1
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@@ -118,7 +118,11 @@ static void* stacksetup(char** argv, char** env, auxv64_list auxv){
char* argdatastart = STACK_TOP - argdatasize; char* argdatastart = STACK_TOP - argdatasize;
char* envdatastart = argdatastart - envdatasize; char* envdatastart = argdatastart - envdatasize;
auxv64_list* auxvstart = (void*)(((uintptr_t)envdatastart & (~0xF)) - sizeof(auxv)); // if the final stack address wouldn't be 16 byte aligned (odd stack entry count), align it
int alignment = ((argc+1) + (envc+1) + 1) & 1 ? 8 : 0;
auxv64_list* auxvstart = (void*)(((uintptr_t)envdatastart & (~0xF)) - sizeof(auxv)) + alignment;
// count + 1 because of a null entry // count + 1 because of a null entry
char** envstart = (void*)auxvstart - (envc + 1)*sizeof(char*); char** envstart = (void*)auxvstart - (envc + 1)*sizeof(char*);