75 lines
3.1 KiB
Rust
75 lines
3.1 KiB
Rust
//! Emulation of a subset of the cpuid x86 instruction.
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use crate::prelude::*;
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/// Emulates a subset of the cpuid x86 instruction.
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///
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/// This emulates an intel cpu with sse and sse2 support, but which doesn't support anything else.
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pub(crate) fn codegen_cpuid_call<'tcx>(
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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leaf: Value,
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_sub_leaf: Value,
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) -> (Value, Value, Value, Value) {
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let leaf_0 = fx.bcx.create_block();
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let leaf_1 = fx.bcx.create_block();
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let leaf_7 = fx.bcx.create_block();
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let leaf_8000_0000 = fx.bcx.create_block();
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let leaf_8000_0001 = fx.bcx.create_block();
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let unsupported_leaf = fx.bcx.create_block();
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let dest = fx.bcx.create_block();
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let eax = fx.bcx.append_block_param(dest, types::I32);
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let ebx = fx.bcx.append_block_param(dest, types::I32);
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let ecx = fx.bcx.append_block_param(dest, types::I32);
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let edx = fx.bcx.append_block_param(dest, types::I32);
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let mut switch = cranelift_frontend::Switch::new();
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switch.set_entry(0, leaf_0);
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switch.set_entry(1, leaf_1);
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switch.set_entry(7, leaf_7);
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switch.set_entry(0x8000_0000, leaf_8000_0000);
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switch.set_entry(0x8000_0001, leaf_8000_0001);
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switch.emit(&mut fx.bcx, leaf, unsupported_leaf);
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fx.bcx.switch_to_block(leaf_0);
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let max_basic_leaf = fx.bcx.ins().iconst(types::I32, 1);
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let vend0 = fx.bcx.ins().iconst(types::I32, i64::from(u32::from_le_bytes(*b"Genu")));
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let vend2 = fx.bcx.ins().iconst(types::I32, i64::from(u32::from_le_bytes(*b"ineI")));
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let vend1 = fx.bcx.ins().iconst(types::I32, i64::from(u32::from_le_bytes(*b"ntel")));
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fx.bcx.ins().jump(dest, &[max_basic_leaf, vend0, vend1, vend2]);
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fx.bcx.switch_to_block(leaf_1);
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let cpu_signature = fx.bcx.ins().iconst(types::I32, 0);
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let additional_information = fx.bcx.ins().iconst(types::I32, 0);
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let ecx_features = fx.bcx.ins().iconst(types::I32, 0);
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let edx_features = fx.bcx.ins().iconst(types::I32, 1 << 25 /* sse */ | 1 << 26 /* sse2 */);
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fx.bcx.ins().jump(dest, &[cpu_signature, additional_information, ecx_features, edx_features]);
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fx.bcx.switch_to_block(leaf_7);
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// This leaf technically has subleaves, but we just return zero for all subleaves.
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let zero = fx.bcx.ins().iconst(types::I32, 0);
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fx.bcx.ins().jump(dest, &[zero, zero, zero, zero]);
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fx.bcx.switch_to_block(leaf_8000_0000);
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let extended_max_basic_leaf = fx.bcx.ins().iconst(types::I32, 0);
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let zero = fx.bcx.ins().iconst(types::I32, 0);
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fx.bcx.ins().jump(dest, &[extended_max_basic_leaf, zero, zero, zero]);
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fx.bcx.switch_to_block(leaf_8000_0001);
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let zero = fx.bcx.ins().iconst(types::I32, 0);
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let proc_info_ecx = fx.bcx.ins().iconst(types::I32, 0);
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let proc_info_edx = fx.bcx.ins().iconst(types::I32, 0);
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fx.bcx.ins().jump(dest, &[zero, zero, proc_info_ecx, proc_info_edx]);
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fx.bcx.switch_to_block(unsupported_leaf);
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crate::trap::trap_unimplemented(
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fx,
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"__cpuid_count arch intrinsic doesn't yet support specified leaf",
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);
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fx.bcx.switch_to_block(dest);
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fx.bcx.ins().nop();
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(eax, ebx, ecx, edx)
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}
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