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Improve dlopen() on Apple Silicon

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- Introduce MAP_JIT which is zero on other platforms
- Invent __jit_begin() and __jit_end() which wrap Apple's APIs
- Runtime dispatch to sys_icache_invalidate() in __clear_cache()
This commit is contained in:
Justine Tunney 2023-11-17 02:33:14 -08:00
parent 7a9e176ecf
commit 529cb4817c
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
20 changed files with 120 additions and 117 deletions
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2
libc/sysv/calls/__sys_mprotect.S Normal file
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@ -0,0 +1,2 @@
#include "libc/sysv/macros.internal.h"
.scall __sys_mprotect,0x04a04a04a204a00a,226,74,globl,hidden

2
libc/sysv/calls/sys_mprotect.S
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@ -1,2 +0,0 @@
#include "libc/sysv/macros.internal.h"
.scall sys_mprotect,0x04a04a04a204a00a,226,74,globl,hidden

1
libc/sysv/consts.sh
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@ -234,6 +234,7 @@ syscon mmap MAP_INHERIT -1 -1 -1 -1 -1 -1 0x00000080 -1 # make
syscon mmap MAP_HASSEMAPHORE 0 0 0x00000200 0x00000200 0x00000200 0 0x00000200 0 # does it matter on x86?
syscon mmap MAP_NOSYNC 0 0 0 0 0x00000800 0 0 0 # flush to physical media only when necessary rather than gratuitously; be sure to use write() rather than ftruncate() with this!
syscon mmap MAP_CONCEAL 0 0 0 0 0x00020000 0x00008000 0x00008000 0 # omit from core dumps; MAP_NOCORE on FreeBSD
syscon mmap MAP_JIT 0 0 0 0x00000800 0 0 0 0 # omit from core dumps; MAP_NOCORE on FreeBSD
syscon compat MAP_NOCORE 0 0 0 0 0x00020000 0x00008000 0x00008000 0 # use MAP_CONCEAL
syscon compat MAP_ANON 0x00000020 0x00000020 0x00001000 0x00001000 0x00001000 0x00001000 0x00001000 0x00000020 # bsd consensus; faked nt
syscon compat MAP_EXECUTABLE 0x00001000 0x00001000 0 0 0 0 0 0 # ignored

2
libc/sysv/consts/MAP_JIT.S Normal file
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@ -0,0 +1,2 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon mmap,MAP_JIT,0,0,0,0x00000800,0,0,0,0

2
libc/sysv/consts/RLIMIT_AS.S
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@ -1,2 +1,2 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon rlimit,RLIMIT_AS,9,9,5,5,10,2,10,0
.syscon rlimit,RLIMIT_AS,9 ,9,5,5,10,2,10,0

2
libc/sysv/consts/map.h
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@ -14,6 +14,7 @@ extern const int MAP_FIXED;
extern const int MAP_FIXED_NOREPLACE;
extern const int MAP_HASSEMAPHORE;
extern const int MAP_INHERIT;
extern const int MAP_JIT;
extern const int MAP_LOCKED;
extern const int MAP_NONBLOCK;
extern const int MAP_NORESERVE;
@ -43,5 +44,4 @@ COSMOPOLITAN_C_END_
#define MAP_ANON MAP_ANONYMOUS
#define MAP_NOCORE MAP_CONCEAL
#endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_MAP_H_ */

2
libc/sysv/syscalls.sh
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@ -45,7 +45,7 @@ scall sys_ppoll 0xfff86da21ffff90f 0x849 globl hidden # consider INTON/INTOFF t
scall sys_lseek 0x0c70a61de20c7008 0x03e globl hidden # netbsd:evilpad, OpenBSD 7.3+
scall __sys_mmap 0x0c50311dd20c5009 0x0de globl hidden # netbsd:pad, OpenBSD 7.3+
scall sys_msync 0x915900841284181a 0x8e3 globl hidden
scall sys_mprotect 0x04a04a04a204a00a 0x0e2 globl hidden
scall __sys_mprotect 0x04a04a04a204a00a 0x0e2 globl hidden
scall __sys_munmap 0x049049049204900b 0x0d7 globl hidden
scall sys_sigaction 0x15402e1a0202e00d 0x086 globl hidden # rt_sigaction on Lunix; __sigaction_sigtramp() on NetBSD
scall __sys_sigprocmask 0x125030154214900e 0x087 globl hidden # a.k.a. rt_sigprocmask, openbsd:byvalue, a.k.a. pthread_sigmask