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feat(compiler) Use x17 as scratch instead of x16 on Aarch64 to help with Apple ABI

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This commit is contained in:
ptitSeb
2021-10-08 16:18:44 +02:00
parent 840d90befa
commit 0c6010ca34
1 changed files with 5 additions and 4 deletions
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9
lib/compiler-llvm/src/compiler.rs
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@ -312,12 +312,13 @@ impl Compiler for LLVMCompiler {
16,
));
// We create a jump to an absolute 64bits address
// using x16 as a scratch register, SystemV declare both x16 and x17 as Intra-Procedural scratch register
// LDR x16, #8 50 00 00 58
// BR x16 00 02 1f d6
// using x17 as a scratch register, SystemV declare both x16 and x17 as Intra-Procedural scratch register
// but Apple ask to just not use x16
// LDR x17, #8 51 00 00 58
// BR x17 20 02 1f d6
// JMPADDR 00 00 00 00 00 00 00 00
let onejump = vec![
0x50, 0x00, 0x00, 0x58, 0x00, 0x02, 0x1f, 0xd6, 0, 0, 0, 0, 0, 0, 0, 0,
0x51, 0x00, 0x00, 0x58, 0x20, 0x02, 0x1f, 0xd6, 0, 0, 0, 0, 0, 0, 0, 0,
];
let mut alljmps = Vec::<u8>::new();
for _ in 0..nj {