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/**************************************************************************/
/* mmglue: midipix architecture- and target-specific bits for musl libc */
/* Copyright (C) 2013--2023 SysDeer Technologies, LLC */
/* Released under the Standard MIT License; see COPYING.MMGLUE. */
/**************************************************************************/
#define _GNU_SOURCE
#include <syscall.h>
#include <sched.h>
/* take advantage of i686 vararg abi */
#define __clone ____clone
#include "pthread_impl.h"
#undef __clone
struct pt_regs {
unsigned long ebx;
unsigned long ecx;
unsigned long edx;
unsigned long esi;
unsigned long edi;
unsigned long ebp;
unsigned long eax;
unsigned long xds;
unsigned long xes;
unsigned long xfs;
unsigned long xgs;
unsigned long orig_eax;
unsigned long eip;
unsigned long xcs;
unsigned long eflags;
unsigned long esp;
unsigned long xss;
unsigned long sbase;
unsigned long slimit;
unsigned long sbottom;
};
typedef long __sys_clone(
unsigned long flags,
void * child_stack,
void * ptid,
void * ctid,
struct pt_regs *regs);
extern unsigned long ** __syscall_vtbl;
int __clone(
__entry_point * fn,
void * child_stack,
int flags,
void * arg,
int * ptid,
void * pthread_self_addr,
int * ctid)
{
uintptr_t sbase;
uintptr_t slimit;
uintptr_t sbottom;
void * stack;
struct pt_regs regs;
__sys_clone * pfn_clone;
pthread_t pthread;
regs.eip = (unsigned long)fn;
regs.ecx = (unsigned long)arg;
regs.edx = (unsigned long)pthread_self_addr;
pfn_clone = (__sys_clone *)(__syscall_vtbl[SYS_clone]);
sbase = (uintptr_t)child_stack;
sbase &= ~(uintptr_t)(0xf);
stack = (void *)sbase;
if (flags == (CLONE_VM|CLONE_VFORK|SIGCHLD)) {
regs.sbase = 0;
regs.slimit = 0;
regs.sbottom = 0;
return (int)pfn_clone(
flags,
stack,
0,0,®s);
}
pthread = (pthread_t)pthread_self_addr;
sbase = (uintptr_t)pthread->stack;
slimit = sbase - pthread->stack_size;
sbottom = slimit - pthread->guard_size;
sbase &= ~(uintptr_t)(0xf);
slimit += 0xf;
slimit |= 0xf;
slimit ^= 0xf;
regs.sbase = sbase;
regs.slimit = slimit;
regs.sbottom = sbottom;
return (int)pfn_clone(
flags,
stack,
ptid,
ctid,
®s);
}
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