diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-08-10 11:43:50 +0200 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-08-11 12:29:31 +0200 |
| commit | d2d0e27c7668017ef3d435a18e5d8008d36632d1 (patch) | |
| tree | 1256590875ac1b4e9c646ae6d4c1186774deca02 /ArmPkg | |
| parent | 66edb631f8a284a9a0884eb6a41a603112dbff52 (diff) | |
| download | edk2-platforms-d2d0e27c7668017ef3d435a18e5d8008d36632d1.tar.xz | |
ArmPkg: introduce ASM_FUNC, MOV32/MOV64 and ADRL/LDRL macros
This introduces the ASM_FUNC() macro to annotate function entry points
in assembler files. This allows us to add additional metadata that
marks a function entry point as a function, and allows us to emit
a .section directive for each function, which makes it possible for
the linker to drop unreferenced code.
In addition, introduce a couple of utility macros that we can use to
clean up the code.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Eugene Cohen <eugene@hp.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Diffstat (limited to 'ArmPkg')
| -rw-r--r-- | ArmPkg/Include/AsmMacroIoLib.h | 23 | ||||
| -rw-r--r-- | ArmPkg/Include/AsmMacroIoLibV8.h | 20 |
2 files changed, 42 insertions, 1 deletions
diff --git a/ArmPkg/Include/AsmMacroIoLib.h b/ArmPkg/Include/AsmMacroIoLib.h index 551b87803d..fb73ea9a46 100644 --- a/ArmPkg/Include/AsmMacroIoLib.h +++ b/ArmPkg/Include/AsmMacroIoLib.h @@ -3,6 +3,7 @@ Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Copyright (c) 2011-2012, ARM Ltd. All rights reserved.<BR>
+ Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -51,4 +52,26 @@ #endif
+#define _ASM_FUNC(Name, Section) \
+ .global Name ; \
+ .section #Section, "ax" ; \
+ .type Name, %function ; \
+ Name:
+
+#define ASM_FUNC(Name) _ASM_FUNC(ASM_PFX(Name), .text. ## Name)
+
+#define MOV32(Reg, Val) \
+ movw Reg, #(Val) & 0xffff ; \
+ movt Reg, #(Val) >> 16
+
+#define ADRL(Reg, Sym) \
+ movw Reg, #:lower16:(Sym) - (. + 16) ; \
+ movt Reg, #:upper16:(Sym) - (. + 12) ; \
+ add Reg, Reg, pc
+
+#define LDRL(Reg, Sym) \
+ movw Reg, #:lower16:(Sym) - (. + 16) ; \
+ movt Reg, #:upper16:(Sym) - (. + 12) ; \
+ ldr Reg, [pc, Reg]
+
#endif
diff --git a/ArmPkg/Include/AsmMacroIoLibV8.h b/ArmPkg/Include/AsmMacroIoLibV8.h index 37fa255f84..e9285f78e7 100644 --- a/ArmPkg/Include/AsmMacroIoLibV8.h +++ b/ArmPkg/Include/AsmMacroIoLibV8.h @@ -3,6 +3,7 @@ Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Portions copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
+ Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -71,5 +72,22 @@ #endif // __GNUC__
-#endif // __MACRO_IO_LIBV8_H__
+#define _ASM_FUNC(Name, Section) \
+ .global Name ; \
+ .section #Section, "ax" ; \
+ .type Name, %function ; \
+ Name:
+
+#define ASM_FUNC(Name) _ASM_FUNC(ASM_PFX(Name), .text. ## Name)
+
+#define MOV32(Reg, Val) \
+ movz Reg, (Val) >> 16, lsl #16 ; \
+ movk Reg, (Val) & 0xffff
+#define MOV64(Reg, Val) \
+ movz Reg, (Val) >> 48, lsl #48 ; \
+ movk Reg, ((Val) >> 32) & 0xffff, lsl #32 ; \
+ movk Reg, ((Val) >> 16) & 0xffff, lsl #16 ; \
+ movk Reg, (Val) & 0xffff
+
+#endif // __MACRO_IO_LIBV8_H__
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