| 1 | use super::{InlineAsmArch, InlineAsmType}; |
|---|---|
| 2 | use rustc_macros::HashStable_Generic; |
| 3 | use rustc_span::Symbol; |
| 4 | use std::fmt; |
| 5 | |
| 6 | def_reg_class! { |
| 7 | Bpf BpfInlineAsmRegClass { |
| 8 | reg, |
| 9 | wreg, |
| 10 | } |
| 11 | } |
| 12 | |
| 13 | impl BpfInlineAsmRegClass { |
| 14 | pub fn valid_modifiers(self, _arch: InlineAsmArch) -> &'static [char] { |
| 15 | &[] |
| 16 | } |
| 17 | |
| 18 | pub fn suggest_class(self, _arch: InlineAsmArch, _ty: InlineAsmType) -> Option<Self> { |
| 19 | None |
| 20 | } |
| 21 | |
| 22 | pub fn suggest_modifier( |
| 23 | self, |
| 24 | _arch: InlineAsmArch, |
| 25 | _ty: InlineAsmType, |
| 26 | ) -> Option<(char, &'static str)> { |
| 27 | None |
| 28 | } |
| 29 | |
| 30 | pub fn default_modifier(self, _arch: InlineAsmArch) -> Option<(char, &'static str)> { |
| 31 | None |
| 32 | } |
| 33 | |
| 34 | pub fn supported_types( |
| 35 | self, |
| 36 | _arch: InlineAsmArch, |
| 37 | ) -> &'static [(InlineAsmType, Option<Symbol>)] { |
| 38 | match self { |
| 39 | Self::reg => types! { _: I8, I16, I32, I64; }, |
| 40 | Self::wreg => types! { alu32: I8, I16, I32; }, |
| 41 | } |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | def_regs! { |
| 46 | Bpf BpfInlineAsmReg BpfInlineAsmRegClass { |
| 47 | r0: reg = ["r0"], |
| 48 | r1: reg = ["r1"], |
| 49 | r2: reg = ["r2"], |
| 50 | r3: reg = ["r3"], |
| 51 | r4: reg = ["r4"], |
| 52 | r5: reg = ["r5"], |
| 53 | r6: reg = ["r6"], |
| 54 | r7: reg = ["r7"], |
| 55 | r8: reg = ["r8"], |
| 56 | r9: reg = ["r9"], |
| 57 | w0: wreg = ["w0"], |
| 58 | w1: wreg = ["w1"], |
| 59 | w2: wreg = ["w2"], |
| 60 | w3: wreg = ["w3"], |
| 61 | w4: wreg = ["w4"], |
| 62 | w5: wreg = ["w5"], |
| 63 | w6: wreg = ["w6"], |
| 64 | w7: wreg = ["w7"], |
| 65 | w8: wreg = ["w8"], |
| 66 | w9: wreg = ["w9"], |
| 67 | |
| 68 | #error = ["r10", "w10"] => |
| 69 | "the stack pointer cannot be used as an operand for inline asm", |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | impl BpfInlineAsmReg { |
| 74 | pub fn emit( |
| 75 | self, |
| 76 | out: &mut dyn fmt::Write, |
| 77 | _arch: InlineAsmArch, |
| 78 | _modifier: Option<char>, |
| 79 | ) -> fmt::Result { |
| 80 | out.write_str(self.name()) |
| 81 | } |
| 82 | |
| 83 | pub fn overlapping_regs(self, mut cb: impl FnMut(BpfInlineAsmReg)) { |
| 84 | cb(self); |
| 85 | |
| 86 | macro_rules! reg_conflicts { |
| 87 | ( |
| 88 | $( |
| 89 | $r:ident : $w:ident |
| 90 | ),* |
| 91 | ) => { |
| 92 | match self { |
| 93 | $( |
| 94 | Self::$r => { |
| 95 | cb(Self::$w); |
| 96 | } |
| 97 | Self::$w => { |
| 98 | cb(Self::$r); |
| 99 | } |
| 100 | )* |
| 101 | } |
| 102 | }; |
| 103 | } |
| 104 | |
| 105 | reg_conflicts! { |
| 106 | r0 : w0, |
| 107 | r1 : w1, |
| 108 | r2 : w2, |
| 109 | r3 : w3, |
| 110 | r4 : w4, |
| 111 | r5 : w5, |
| 112 | r6 : w6, |
| 113 | r7 : w7, |
| 114 | r8 : w8, |
| 115 | r9 : w9 |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 |