From: Mark Wooding <mdw@distorted.org.uk>
Date: Thu, 26 May 2016 08:26:09 +0000 (+0100)
Subject: base/asm-common.h: Introduce bad literal-pool handling macros.
X-Git-Tag: 2.2.4~26
X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/commitdiff_plain/f8e509a9dd942ca23013df8fd7a834d30589f8b8?hp=2d03a881ef603023163e49d6bfb7f87afa469823

base/asm-common.h: Introduce bad literal-pool handling macros.

Abuse subsections for arranging to place literals near the functions
which need them.  These are no use for human-written code, but they're
useful in macros, especially since GAS is actually rather bad at dealing
with complex expressions and relocation types in its ARM literal syntax.
---

diff --git a/base/asm-common.h b/base/asm-common.h
index 28ddd0d1..aa6b4c3e 100644
--- a/base/asm-common.h
+++ b/base/asm-common.h
@@ -27,6 +27,13 @@
 ///--------------------------------------------------------------------------
 /// General definitions.
 
+// Some useful variables.
+	.L$_subsec = 0
+
+// Literal pools done the hard way.
+#define _LIT .text .L$_subsec + 1
+#define _ENDLIT .text .L$_subsec
+
 // Announcing an external function.
 #define FUNC(name)							\
 	.globl	F(name);						\
@@ -40,7 +47,9 @@ F(name):								\
 #define _ENDFUNC(name)							\
 	.purgem	ENDFUNC;						\
 	SIZE_OBJ(name);							\
-	ENDFUNC_HOOK(name)
+	ENDFUNC_HOOK(name);						\
+	.L$_subsec = .L$_subsec + 2;					\
+	.text .L$_subsec
 
 ///--------------------------------------------------------------------------
 /// ELF-specific hacking.