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compiler-rt: More clear_cache implementations

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LemonBoy 2020-03-31 12:40:28 +02:00 • committed by Andrew Kelley
parent d57b5205c6
commit e9c49f423d
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GPG key ID: 7C5F548F728501A9
2 changed files with 33 additions and 17 deletions
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2
lib/std/special/compiler_rt.zig
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@ -20,6 +20,8 @@ comptime {
.aarch64,
.aarch64_be,
.aarch64_32,
.riscv32,
.riscv64,
=> @export(@import("compiler_rt/clear_cache.zig").clear_cache, .{
.name = "__clear_cache",
.linkage = linkage,

44
lib/std/special/compiler_rt/clear_cache.zig
View file

@ -26,6 +26,10 @@ pub fn clear_cache(start: usize, end: usize) callconv(.C) void {
.mips, .mipsel, .mips64, .mips64el => true,
else => false,
};
const riscv = switch (arch) {
.riscv32, .riscv64 => true,
else => false,
};
const powerpc64 = switch (arch) {
.powerpc64, .powerpc64le => true,
else => false,
@ -45,28 +49,31 @@ pub fn clear_cache(start: usize, end: usize) callconv(.C) void {
@compileError("TODO");
// FlushInstructionCache(GetCurrentProcess(), start, end - start);
} else if (arm32 and !apple) {
if (os == .freebsd or os == .netbsd) {
// struct arm_sync_icache_args arg;
//
// arg.addr = (uintptr_t)start;
// arg.len = (uintptr_t)end - (uintptr_t)start;
//
// sysarch(ARM_SYNC_ICACHE, &arg);
@compileError("TODO: implement for NetBSD/FreeBSD");
} else if (os == .linux) {
switch (os) {
.freebsd, .netbsd => {
var arg = arm_sync_icache_args{
.addr = start,
.len = end - start,
};
const result = sysarch(ARM_SYNC_ICACHE, @ptrToInt(&arg));
std.debug.assert(result == 0);
},
.linux => {
const result = std.os.linux.syscall3(.cacheflush, start, end, 0);
std.debug.assert(result == 0);
} else {
@compileError("no __clear_cache implementation available for this target");
},
else => @compileError("TODO"),
}
} else if (os == .linux and mips) {
@compileError("TODO");
//const uintptr_t start_int = (uintptr_t)start;
//const uintptr_t end_int = (uintptr_t)end;
//syscall(__NR_cacheflush, start, (end_int - start_int), BCACHE);
const flags = 3; // ICACHE | DCACHE
const result = std.os.linux.syscall3(std.os.linux.SYS_cacheflush, start, end - start, flags);
std.debug.assert(result == 0);
} else if (mips and os == .openbsd) {
@compileError("TODO");
//cacheflush(start, (uintptr_t)end - (uintptr_t)start, BCACHE);
} else if (os == .linux and riscv) {
const result = std.os.linux.syscall3(std.os.linux.SYS_riscv_flush_icache, start, end - start, 0);
std.debug.assert(result == 0);
} else if (arm64 and !apple) {
// Get Cache Type Info.
// TODO memoize this?
@ -142,3 +149,10 @@ pub fn clear_cache(start: usize, end: usize) callconv(.C) void {
// Darwin-only
extern fn sys_icache_invalidate(start: usize, len: usize) void;
// BSD-only
const arm_sync_icache_args = extern struct {
addr: usize, // Virtual start address
len: usize, // Region size
};
const ARM_SYNC_ICACHE = 0;
extern "c" fn sysarch(number: i32, args: usize) i32;