add loongarch64 arch support

.github/workflows/ci.yml

@@ -51,12 +51,13 @@ jobs:
           i686-unknown-linux-gnu,
           aarch64-unknown-linux-gnu,
           riscv64gc-unknown-linux-gnu,
+          loongarch64-unknown-linux-gnu,
         ]
     steps:
     - name: checkout
       uses: actions/checkout@v4
     - name: Set up cross
-      run: cargo install cross
+      run: cargo install cross --git https://github.com/cross-rs/cross
     - name: Build all features
       run: cross build --verbose --all-features --target ${{ matrix.target }}
     - name: Run tests

src/arch/loongarch64.rs

@@ -0,0 +1,74 @@
+//! loongarch64 arch-sepcific implementations
+
+use crate::{JumpEntry, JumpLabelType};
+
+/// Length of jump instruction to be replaced
+pub const ARCH_JUMP_INS_LENGTH: usize = 4;
+
+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(),
+    }
+}
+
+#[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
+            "#
+        )
+    };
+}
+
+#[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
+            "#
+        )
+    };
+}

src/arch/mod.rs

@@ -17,6 +17,10 @@ pub use aarch64::*;
 
 #[cfg(target_arch = "riscv64")]
 mod riscv64;
-
 #[cfg(target_arch = "riscv64")]
 pub use riscv64::*;
+
+#[cfg(target_arch = "loongarch64")]
+mod loongarch64;
+#[cfg(target_arch = "loongarch64")]
+pub use loongarch64::*;