[PATCH v4 03/10] powerpc: introduce macro LOAD_REG_ADDR_PIC
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STALE4695d
From: Kevin Hao <hidden>
Date: 2013-12-24 07:13:21
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Revision v4 (3 revisions archived).
Revisions (3)
- v2
- v3 [diff against previous]
- v4 current [diff against previous]
This is used to get the address of a variable when the kernel is not
running at the linked or relocated address.
Signed-off-by: Kevin Hao <redacted>
---
v4: A new patch in v4.
arch/powerpc/include/asm/ppc_asm.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index f595b98079ee..1279c59624ed 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h@@ -295,6 +295,11 @@ n: * you want to access various offsets within it). On ppc32 this is * identical to LOAD_REG_IMMEDIATE. * + * LOAD_REG_ADDR_PIC(rn, name) + * Loads the address of label 'name' into register 'run'. Use this when + * the kernel doesn't run at the linked or relocated address. Please + * note that this macro will clobber the lr register. + * * LOAD_REG_ADDRBASE(rn, name) * ADDROFF(name) * LOAD_REG_ADDRBASE loads part of the address of label 'name' into
@@ -305,6 +310,14 @@ n: * LOAD_REG_ADDRBASE(rX, name) * ld rY,ADDROFF(name)(rX) */ + +/* Be careful, this will clobber the lr register. */ +#define LOAD_REG_ADDR_PIC(reg, name) \ + bl 0f; \ +0: mflr reg; \ + addis reg,reg,(name - 0b)@ha; \ + addi reg,reg,(name - 0b)@l; + #ifdef __powerpc64__ #define LOAD_REG_IMMEDIATE(reg,expr) \ lis reg,(expr)@highest; \
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1.8.3.1