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#define _GNU_SOURCE
#include <syscall.h>
#include <sched.h>
/* take advantage of winnt's x64 vararg abi */
#define __clone ____clone
#include "pthread_impl.h"
#undef __clone
struct pt_regs {
unsigned long r15;
unsigned long r14;
unsigned long r13;
unsigned long r12;
unsigned long rbp;
unsigned long rbx;
unsigned long r11;
unsigned long r10;
unsigned long r9;
unsigned long r8;
unsigned long rax;
unsigned long rcx;
unsigned long rdx;
unsigned long rsi;
unsigned long rdi;
unsigned long orig_rax;
unsigned long rip;
unsigned long cs;
unsigned long eflags;
unsigned long rsp;
unsigned long ss;
uintptr_t sbase;
uintptr_t slimit;
uintptr_t sbottom;
};
typedef long __sys_clone(
unsigned long flags,
void * child_stack,
void * ptid,
void * ctid,
struct pt_regs *regs);
extern unsigned long ** __syscall_vtbl;
hidden int __clone(
int (*fn)(void *),
void * child_stack,
int flags,
void * arg,
int * ptid,
void * pthread_self_addr,
int * ctid)
{
struct pt_regs regs;
__sys_clone * pfn_clone;
pthread_t pthread;
regs.rip = (unsigned long)fn;
regs.rcx = (unsigned long)arg;
regs.rdx = (unsigned long)pthread_self_addr;
pfn_clone = (__sys_clone *)(__syscall_vtbl[SYS_clone]);
if (flags == (CLONE_VM|CLONE_VFORK|SIGCHLD)) {
regs.sbase = 0;
regs.slimit = 0;
regs.sbottom = 0;
return (int)pfn_clone(
flags,
child_stack,
0,0,®s);
}
pthread = (pthread_t)pthread_self_addr;
regs.sbase = (unsigned long)pthread->stack;
regs.slimit = regs.sbase - pthread->stack_size;
regs.sbottom = regs.slimit - pthread->guard_size;
return (int)pfn_clone(
flags,
child_stack,
ptid,
ctid,
®s);
}
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