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Cider Isn't Darwin Emulation, Really
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127#include "bsdthread_create.h"#include "bsdthread_register.h"#include "../base.h"#include "../errno.h"#include <linux-syscalls/linux.h>#include <stddef.h>#include <stdint.h>#include "../../../../../platform-include/sys/mman.h"#include "../../../../startup/threads.h"#include "../../../../../platform-include/sys/errno.h"#include "../mman/mman.h"#include "../simple.h"
extern void *memset(void *s, int c, size_t n);
#define PTHREAD_START_CUSTOM 0x01000000#define PTHREAD_START_SETSCHED 0x02000000#define PTHREAD_START_DETACHED 0x04000000#define PTHREAD_START_POLICY_BITSHIFT 16#define PTHREAD_START_POLICY_MASK 0xff#define PTHREAD_START_IMPORTANCE_MASK 0xffff
#define STACK_GUARD_SIZE 4096
// http://www.tldp.org/FAQ/Threads-FAQ/clone.c
long sys_bsdthread_create(void* thread_start, void* arg, void** stack, void* pthread, uint32_t flags){#ifndef VARIANT_DYLD // dyld doesn't create threads int ret; unsigned long stacksize = 0;
#ifndef BSDTHREAD_WRAP_LINUX_PTHREAD if (!(flags & PTHREAD_START_CUSTOM)) { // We have to allocate stack ourselves pthread = stack = thread_stack_allocate(stacksize); }
ret = darling_thread_create((void**) stack, pthread_entry_point, thread_start, arg, stacksize, flags);#else // Implemented in libdyld extern int thread_self_trap(void);
return __darling_thread_create(((uintptr_t)stack), pthread_obj_size, pthread_entry_point, thread_start, arg, (uintptr_t) stack, flags, thread_self_trap);#endif
if (ret < 0) return errno_linux_to_bsd(ret);
return pthread;#else return -ENOSYS;#endif}
void* thread_stack_allocate(unsigned long stacksize){ unsigned long allocsize; void* stack;
// The pthread object is placed above stack area allocsize = stacksize + pthread_obj_size + STACK_GUARD_SIZE; allocsize = (allocsize + 4095) & ~4095; // round up to page size
stack = (void**) sys_mmap(NULL, allocsize, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
// Protect the stack guard sys_mprotect(stack, STACK_GUARD_SIZE, PROT_NONE); if (((intptr_t)stack) < 0 && ((intptr_t)stack) >= -4095) return NULL;
return (void*) (((uintptr_t)stack) + stacksize + STACK_GUARD_SIZE);}
#if 0int darling_thread_create(void** stack, void* entry_point, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5, uintptr_t arg6){ int ret;
#if defined(__x86_64__) // Store these arguments to pthread_entry point on the stack stack[-1] = entry_point; stack[-2] = arg3; stack[-3] = arg4; stack[-4] = arg5; stack[-5] = arg6;
__asm__ __volatile__ ( "syscall\n" // invoke sys_clone "testl %0, %0\n" // if in parent thread, jump away "jne 1f\n" "subq $40, %%rsp\n" // protect what we have stored on stack "call _thread_self_trap\n" // get thread_self Mach port "addq $40, %%rsp\n" "movl %%eax, %%esi\n" // thread_self is 2nd arg to pthread_entry_point "movq %%rsp, %%rdi\n" // pthread_self as 1st arg "movq -16(%%rsp), %%rdx\n" // thread_start as 3rd arg "movq -32(%%rsp), %%r8\n" // stack_size as 5th arg "movq -24(%%rsp), %%rcx\n" // thread arg as 4th arg "movq -40(%%rsp), %%r9\n" // flags as 6th arg "movq -8(%%rsp), %%rbx\n" "jmp *%%rbx\n" "1:\n" : "=a"(ret) : "0" (__NR_clone), "D"(LINUX_CLONE_THREAD | LINUX_CLONE_VM | LINUX_CLONE_SIGHAND | LINUX_CLONE_FILES | LINUX_CLONE_FS | LINUX_CLONE_SYSVSEM), "S"(stack));#elif defined(__i386__)# warning Missing clone call assembly!#else# warning Missing clone call assembly!#endif return ret;}#endif