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Add comments to describe PowerPC64 ABI register usage.

This commit is contained in:
matt 2003-02-08 20:03:22 +00:00
parent 3532c35bc6
commit 4fefe75ac1
1 changed files with 40 additions and 21 deletions
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61
sys/arch/powerpc/include/reg.h
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@ -1,4 +1,4 @@
/* $NetBSD: reg.h,v 1.8 2002/07/05 18:45:21 matt Exp $ */
/* $NetBSD: reg.h,v 1.9 2003/02/08 20:03:22 matt Exp $ */
#ifndef _POWERPC_REG_H_
#define _POWERPC_REG_H_
@ -6,27 +6,46 @@
/*
* Register Usage according the SVR4 ABI for PPC.
*
* Register Name Usage
* r0 Volatile register which may be modified during
* function linkage
* r1 Stack fram pointer, always valid
* r2 System-reserved register
* r3-r4 Volatile registers used for parameter passing and
* return values
* r5-r10 Volatile registers used for parameter passing
* r11-r12 Volatile register which may be modified during
* function linkage
* [Start of callee-saved registers]
* r13 Small data area pointer register
* r14-r30 Registers used for local variables
* r31 Used for local variable or "environent pointers"
* Register Usage
* r0 Volatile register which may be modified during function linkage
* r1 Stack fram pointer, always valid
* r2 System-reserved register
* r3-r4 Volatile registers used for parameter passing and return values
* r5-r10 Volatile registers used for parameter passing
* r11-r12 Volatile register which may be modified during function linkage
* r13 Small data area pointer register
* f0 Volatile register
* f1 Volatile registers used for parameter passing and return values
* f2-f8 Volatile registers used for parameter passing
* f9-f13 Volatile registers
*
* [Start of callee-saved registers]
* r14-r30 Registers used for local variables
* r31 Used for local variable or "environent pointers"
* f14-f31 Registers used for local variables
*
*
* Register Usage according the ELF64 ABI (PowerOpen/AIX) for PPC.
*
* Register Usage
* r0 Volatile register which may be modified during function linkage
* r1 Stack fram pointer, always valid
* r2 TOC pointer
* r3 Volatile register used for parameter passing and return value
* r4-r10 Volatile registers used for parameter passing
* r11 Volatile register used in calls by pointer and as an
* environment pointr for languages which require one
* r12 Volatile register used for exception handling and glink code
* r13 Reserved for use as system thread ID
*
* f0 Volatile register
* f1-f4 Volatile registers used for parameter passing and return values
* f5-f13 Volatile registers used for parameter passing
* [Start of callee-saved registers]
* r14-r31 Registers used for local variables
* f14-f31 Registers used for local variables
*
* f0 Volatile register
* f1 Volatile registers used for parameter passing and
* return values
* f2-f8 Volatile registers used for parameter passing
* f9-f13 Volatile registers
* f14-f31 Registers used for local variables
*/
struct reg { /* base registers */