ed27f18e32
Adds support for __sys Clang builtin for AArch64 __sys is a long existing MSVC intrinsic used to manage caches, tlbs, etc by writing to system registers: * It takes a macro-generated constant and uses it to form the AArch64 SYS instruction which is MSR with op0=1. The macro drops op0 and expects the implementation to hardcode it to 1 in the encoding. * Volume use is in systems code (kernels, hypervisors, boot environments, firmware) * Has an unused return value due to MSVC cut/paste error Implementation: * Clang builtin, sharing code with Read/WriteStatusReg * Hardcodes the op0=1 * Explicitly returns 0 * Code-format change from clang-format * Unittests included * Not limited to MSVC-environment as its generally useful and neutral
36 lines
1.3 KiB
C
36 lines
1.3 KiB
C
// RUN: %clang_cc1 -triple arm64-windows -fsyntax-only -verify \
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// RUN: -fms-compatibility -ffreestanding -fms-compatibility-version=17.00 %s
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#include <intrin.h>
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void check__break(int x) {
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__break(-1); // expected-error-re {{argument value {{.*}} is outside the valid range}}
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__break(65536); // expected-error-re {{argument value {{.*}} is outside the valid range}}
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__break(x); // expected-error {{argument to '__break' must be a constant integer}}
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}
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void check__hlt() {
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__hlt(-1); // expected-error-re {{argument value {{.*}} is outside the valid range}}
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__hlt(65536); // expected-error-re {{argument value {{.*}} is outside the valid range}}
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}
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void check__getReg(void) {
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__getReg(-1); // expected-error-re {{argument value {{.*}} is outside the valid range}}
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__getReg(32); // expected-error-re {{argument value {{.*}} is outside the valid range}}
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}
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void check_ReadWriteStatusReg(int v) {
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int x;
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_ReadStatusReg(x); // expected-error {{argument to '_ReadStatusReg' must be a constant integer}}
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_WriteStatusReg(x, v); // expected-error {{argument to '_WriteStatusReg' must be a constant integer}}
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}
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void check__sys(int v) {
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int x;
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__sys(x, v); // expected-error {{argument to '__sys' must be a constant integer}}
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}
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unsigned int check__sys_retval() {
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return __sys(0, 1); // builtin has superfluous return value for MSVC compatibility
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}
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