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Merge pull request #4 from Godones/master
add loongarch64 arch support
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Original file line number | Diff line number | Diff line change |
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//! loongarch64 arch-sepcific implementations | ||
use crate::{JumpEntry, JumpLabelType}; | ||
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/// Length of jump instruction to be replaced | ||
pub const ARCH_JUMP_INS_LENGTH: usize = 4; | ||
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const LOONGARCH64_INSN_NOP: u32 = 0x03400000; | ||
const LOONGARCH64_INSN_B: u32 = 0x50000000; | ||
/// New instruction generated according to jump label type and jump entry | ||
#[inline(always)] | ||
pub fn arch_jump_entry_instruction( | ||
jump_label_type: JumpLabelType, | ||
jump_entry: &JumpEntry, | ||
) -> [u8; ARCH_JUMP_INS_LENGTH] { | ||
match jump_label_type { | ||
// 010100 [IMM] | ||
// opcode I26[15:0] I26[25:16] | ||
JumpLabelType::Jmp => { | ||
// Note that loongarch64 only supports relative address within +/-128MB. | ||
// In current implementation, this assumption is always hold. | ||
let relative_addr = (jump_entry.target_addr() - jump_entry.code_addr()) as u32; | ||
// MASK 25:16 = 0b_0000_0011_1111_1111_0000_0000_0000_0000 = 0x03FF0000 | ||
// MASK 15:0 = 0b_0000_0000_0000_0000_1111_1111_1111_1111 = 0x0000FFFF | ||
let mut b = LOONGARCH64_INSN_B; | ||
let relative_addr = relative_addr >> 2; | ||
b |= ((relative_addr & 0x03FF0000) >> 16) | ((relative_addr & 0x0000FFFF) << 10); | ||
b.to_ne_bytes() | ||
} | ||
JumpLabelType::Nop => LOONGARCH64_INSN_NOP.to_ne_bytes(), | ||
} | ||
} | ||
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#[doc(hidden)] | ||
#[macro_export] | ||
macro_rules! arch_static_key_init_nop_asm_template { | ||
() => { | ||
::core::concat!( | ||
r#" | ||
2: | ||
nop | ||
.pushsection "#, | ||
$crate::os_static_key_sec_name_attr!(), | ||
r#" | ||
.balign 8 | ||
.quad 2b - . | ||
.quad {0} - . | ||
.quad {1} + {2} - . | ||
.popsection | ||
"# | ||
) | ||
}; | ||
} | ||
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#[doc(hidden)] | ||
#[macro_export] | ||
macro_rules! arch_static_key_init_jmp_asm_template { | ||
() => { | ||
::core::concat!( | ||
r#" | ||
2: | ||
b {0} | ||
.pushsection "#, | ||
$crate::os_static_key_sec_name_attr!(), | ||
r#" | ||
.balign 8 | ||
.quad 2b - . | ||
.quad {0} - . | ||
.quad {1} + {2} - . | ||
.popsection | ||
"# | ||
) | ||
}; | ||
} |
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