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decided to split up loading of 64-bit immediates

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Matt Knight 2020-08-18 22:18:36 -07:00 committed by Andrew Kelley
parent 7f1378909b
commit bc1536f4bf
1 changed files with 25 additions and 21 deletions
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46
lib/std/os/bits/linux/bpf.zig
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@ -460,27 +460,32 @@ pub const Insn = packed struct {
};
}
fn ld_imm_impl(dst: Reg, src: Reg, imm: u64) [2]Insn {
return [2]Insn{
Insn{
.code = LD | DW | IMM,
.dst = @enumToInt(dst),
.src = @enumToInt(src),
.off = 0,
.imm = @intCast(i32, @truncate(u32, imm)),
},
Insn{
.code = 0,
.dst = 0,
.src = 0,
.off = 0,
.imm = @intCast(i32, @truncate(u32, imm >> 32)),
},
fn ld_imm_impl1(dst: Reg, src: Reg, imm: u64) Insn {
return Insn{
.code = LD | DW | IMM,
.dst = @enumToInt(dst),
.src = @enumToInt(src),
.off = 0,
.imm = @intCast(i32, @truncate(u32, imm)),
};
}
pub fn ld_map_fd(dst: Reg, map_fd: fd_t) [2]Insn {
return ld_imm_impl(dst, @intToEnum(Reg, PSEUDO_MAP_FD), @intCast(u64, map_fd));
fn ld_imm_impl2(imm: u64) Insn {
return Insn{
.code = 0,
.dst = 0,
.src = 0,
.off = 0,
.imm = @intCast(i32, @truncate(u32, imm >> 32)),
};
}
pub fn ld_map_fd1(dst: Reg, map_fd: fd_t) Insn {
return ld_imm_impl1(dst, @intToEnum(Reg, PSEUDO_MAP_FD), @intCast(u64, map_fd));
}
pub fn ld_map_fd2(map_fd: fd_t) Insn {
return ld_imm_impl2(@intCast(u64, map_fd));
}
pub fn call(helper: Helper) Insn {
@ -533,9 +538,8 @@ test "ld_abs" {
}
test "ld_map_fd" {
const insns = Insn.ld_map_fd(.r1, 42);
expect_insn(insns[0], 0x0000002a00001118);
expect_insn(insns[1], 0x0000000000000000);
expect_insn(Insn.ld_map_fd1(.r1, 42), 0x0000002a00001118);
expect_insn(Insn.ld_map_fd2(42), 0x0000000000000000);
}
// st instructions