base/asm-common.h: Add an `IMM' macro for immediate operands.

The most useful version of this is `IMM(r, ...)', because that varies
according to the target architecture, but the others might be considered
an improvement over the Intel syntax.

It turns out that I don't actually need this: the motivation was caused
by a typo-ed register field.  But I think it still makes a useful
addition.

diff --git a/base/asm-common.h b/base/asm-common.h
index 040250b..3ef0de9 100644 (file)
--- a/base/asm-common.h
+++ b/base/asm-common.h
@@ -286,17 +286,26 @@ name:
 #  define _DECOR_mem_q(addr) qword ptr addr
 #endif
 
+#define _DECOR_imm_b(imm) byte imm
+#define _DECOR_imm_w(imm) word imm
+#define _DECOR_imm_d(imm) dword imm
+#if CPUFAM_AMD64
+#  define _DECOR_imm_q(imm) qword imm
+#endif
+
 #if CPUFAM_X86
 #  define _DECOR_abcd_r(reg) e##reg##x
 #  define _DECOR_xp_r(reg) e##reg
 #  define _DECOR_ip_r(reg) e##reg
 #  define _DECOR_mem_r(addr) dword ptr addr
+#  define _DECOR_imm_r(imm) dword imm
 #endif
 #if CPUFAM_AMD64
 #  define _DECOR_abcd_r(reg) r##reg##x
 #  define _DECOR_xp_r(reg) r##reg
 #  define _DECOR_ip_r(reg) r##reg
 #  define _DECOR_mem_r(addr) qword ptr addr
+#  define _DECOR_imm_r(imm) qword imm
 #endif
 
 // R_r(decor) applies decoration decor to register r, which is an internal
@@ -326,6 +335,9 @@ name:
 // address addr (which should supply its own square-brackets).
 #define MEM(decor, addr) _DECOR(mem, decor, addr)
 
+// Refer to an immediate datum of the type implied by decor.
+#define IMM(decor, imm) _DECOR(mem, decor, imm)
+
 // Applies decoration decor to assembler-level register name reg.
 #define _REGFORM(reg, decor) _GLUE(_REGFORM_, reg)(decor)