ptos/amd64: frame: Add assembly frame macros

Signed-off-by: Chloe M <chloe@mensia.org>

service/ptos/head/arch/amd64/frameasm.h

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: AMD64 trapframe helpers
+ * Author:      Chloe M.
+ */
+
+#ifndef _MACHINE_FRAMEASM_H_
+#define _MACHINE_FRAMEASM_H_ 1
+
+/*
+ * Push all general purpose registers alongside an
+ * interrupt vector number
+ */
+#define _TRAP_PUSHALL(VEC)   \
+    push %r15               ;\
+    push %r14               ;\
+    push %r13               ;\
+    push %r12               ;\
+    push %r11               ;\
+    push %r10               ;\
+    push %r9                ;\
+    push %r8                ;\
+    push %rbp               ;\
+    push %rdi               ;\
+    push %rsi               ;\
+    push %rdx               ;\
+    push %rcx               ;\
+    push %rbx               ;\
+    push %rax               ;\
+    push $VEC
+
+/*
+ * Pop an interrupt vector alongside all general purpose
+ * registers
+ */
+#define _TRAP_POPALL()      ;\
+    add $8, %rsp            ;\
+    pop %rax                ;\
+    pop %rbx                ;\
+    pop %rcx                ;\
+    pop %rdx                ;\
+    pop %rsi                ;\
+    pop %rdi                ;\
+    pop %rbp                ;\
+    pop %r8                 ;\
+    pop %r9                 ;\
+    pop %r10                ;\
+    pop %r11                ;\
+    pop %r12                ;\
+    pop %r13                ;\
+    pop %r14                ;\
+    pop %r15                ;\
+    add $8, %rsp
+
+/*
+ * Interrupt entry macro used when the CPU pushes an error
+ * code onto the stack.
+ */
+#define INTR_ENTRY_EC(VEC)   \
+    cld                     ;\
+    _TRAP_PUSHALL()         ;\
+    testb $3, 16(%rsp)      ;\
+    jz 1f                   ;\
+    lfence                  ;\
+    swapgs                  ;\
+1:
+
+/*
+ * Interrupt entry macro used when there is no error code pushed
+ * onto the stack.
+ */
+#define INTR_ENTRY(VEC)     ;\
+    cld                     ;\
+    push $0                 ;\
+    _TRAP_PUSHALL()         ;\
+    testb $3, 8(%rsp)       ;\
+    jz 1f                   ;\
+    lfence                  ;\
+    swapgs                  ;\
+1:
+
+/*
+ * Interrupt exit macro used when there is no error code
+ * pushed onto the stack.
+ */
+#define INTR_EXIT()         ;\
+    _POP_FRAME()            ;\
+    testb $3, 8(%rsp)       ;\
+    jz 1f                   ;\
+    lfence                  ;\
+    swapgs                  ;\
+1:
+
+#endif  /* !_MACHINE_FRAMEASM_H_ */