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compiler-rt: implement __clear_cache() for arm/mips64-openbsd

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Alex Rønne Petersen 2025-12-02 00:40:41 +01:00
parent 616488eec7
commit 26751fb31a
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1 changed files with 37 additions and 23 deletions
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60
lib/compiler_rt/clear_cache.zig
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@ -62,12 +62,13 @@ fn clear_cache(start: usize, end: usize) callconv(.c) void {
// exportIt();
} else if (arm32 and !apple) {
switch (os) {
.freebsd, .netbsd => {
var arg = arm_sync_icache_args{
// FreeBSD and NetBSD should be changed to do direct syscalls here...
.freebsd, .netbsd, .openbsd => {
var arg: arm_sync_icache_args = .{
.addr = start,
.len = end - start,
.size = end - start,
};
const result = sysarch(ARM_SYNC_ICACHE, @intFromPtr(&arg));
const result = sysarch(ARM_SYNC_ICACHE, &arg);
std.debug.assert(result == 0);
exportIt();
},
@ -79,32 +80,32 @@ fn clear_cache(start: usize, end: usize) callconv(.c) void {
else => {},
}
} else if (os == .linux and mips) {
const flags = 3; // ICACHE | DCACHE
const result = std.os.linux.syscall3(.cacheflush, start, end - start, flags);
const result = std.os.linux.syscall3(.cacheflush, start, end - start, ICACHE | DCACHE);
std.debug.assert(result == 0);
exportIt();
} else if (os == .netbsd and mips) {
// Replace with https://github.com/ziglang/zig/issues/23904 in the future.
const cfa: extern struct {
va: usize,
nbytes: usize,
whichcache: u32,
} = .{
.va = start,
.nbytes = end - start,
.whichcache = 3, // ICACHE | DCACHE
const cfa: mips_cacheflush_args = .{
.addr = start,
.size = end - start,
.which = ICACHE | DCACHE,
};
asm volatile ("syscall"
:
: [_] "{$2}" (165), // nr = SYS_sysarch
[_] "{$4}" (0), // op = MIPS_CACHEFLUSH
[_] "{$4}" (MIPS_CACHEFLUSH), // op
[_] "{$5}" (&cfa), // args = &cfa
: .{ .r1 = true, .r2 = true, .r3 = true, .r4 = true, .r5 = true, .r6 = true, .r7 = true, .r8 = true, .r9 = true, .r10 = true, .r11 = true, .r12 = true, .r13 = true, .r14 = true, .r15 = true, .r24 = true, .r25 = true, .hi = true, .lo = true, .memory = true });
exportIt();
} else if (mips and os == .openbsd) {
// TODO
//cacheflush(start, (uintptr_t)end - (uintptr_t)start, BCACHE);
// exportIt();
const cfa: mips_cacheflush_args = .{
.addr = start,
.size = end - start,
.which = ICACHE | DCACHE,
};
const result = sysarch(MIPS_CACHEFLUSH, &cfa);
std.debug.assert(result == 0);
exportIt();
} else if (os == .linux and riscv) {
const result = std.os.linux.syscall3(.riscv_flush_icache, start, end - start, 0);
std.debug.assert(result == 0);
@ -191,12 +192,25 @@ fn exportIt() void {
@export(&clear_cache, .{ .name = "__clear_cache", .linkage = common.linkage, .visibility = common.visibility });
}
// MIPS-only
const ICACHE = 0x1;
const DCACHE = 0x2;
// 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;
const arm_sync_icache_args = extern struct {
addr: usize,
size: usize,
};
const MIPS_CACHEFLUSH = 0;
const mips_cacheflush_args = extern struct {
addr: usize,
size: usize,
which: c_uint,
};
extern fn sysarch(op: c_uint, args: *const anyopaque) c_int;