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/* * arch/mips/dec/prom/call_o32.S * * O32 interface for the 64 (or N32) ABI. * * Copyright (C) 2002 Maciej W. Rozycki * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <asm/asm.h> #include <asm/regdef.h> /* Maximum number of arguments supported. Must be even! */ #define O32_ARGC 32 /* Number of static registers we save. */ #define O32_STATC 11 /* Frame size for static register */ #define O32_FRAMESZ (SZREG * O32_STATC) /* Frame size on new stack */ #define O32_FRAMESZ_NEW (SZREG + 4 * O32_ARGC) .text /* * O32 function call dispatcher, for interfacing 32-bit ROM routines. * * The standard 64 (N32) calling sequence is supported, with a0 * holding a function pointer, a1 a new stack pointer, a2-a7 -- its * first six arguments and the stack -- remaining ones (up to O32_ARGC, * including a2-a7). Static registers, gp and fp are preserved, v0 holds * a result. This code relies on the called o32 function for sp and ra * restoration and this dispatcher has to be placed in a KSEGx (or KUSEG) * address space. Any pointers passed have to point to addresses within * one of these spaces as well. */ NESTED(call_o32, O32_FRAMESZ, ra) REG_SUBU sp,O32_FRAMESZ REG_S ra,O32_FRAMESZ-1*SZREG(sp) REG_S fp,O32_FRAMESZ-2*SZREG(sp) REG_S gp,O32_FRAMESZ-3*SZREG(sp) REG_S s7,O32_FRAMESZ-4*SZREG(sp) REG_S s6,O32_FRAMESZ-5*SZREG(sp) REG_S s5,O32_FRAMESZ-6*SZREG(sp) REG_S s4,O32_FRAMESZ-7*SZREG(sp) REG_S s3,O32_FRAMESZ-8*SZREG(sp) REG_S s2,O32_FRAMESZ-9*SZREG(sp) REG_S s1,O32_FRAMESZ-10*SZREG(sp) REG_S s0,O32_FRAMESZ-11*SZREG(sp) move jp,a0 REG_SUBU s0,a1,O32_FRAMESZ_NEW REG_S sp,O32_FRAMESZ_NEW-1*SZREG(s0) sll a0,a2,zero sll a1,a3,zero sll a2,a4,zero sll a3,a5,zero sw a6,0x10(s0) sw a7,0x14(s0) PTR_LA t0,O32_FRAMESZ(sp) PTR_LA t1,0x18(s0) li t2,O32_ARGC-6 1: lw t3,(t0) REG_ADDU t0,SZREG sw t3,(t1) REG_SUBU t2,1 REG_ADDU t1,4 bnez t2,1b move sp,s0 jalr jp REG_L sp,O32_FRAMESZ_NEW-1*SZREG(sp) REG_L s0,O32_FRAMESZ-11*SZREG(sp) REG_L s1,O32_FRAMESZ-10*SZREG(sp) REG_L s2,O32_FRAMESZ-9*SZREG(sp) REG_L s3,O32_FRAMESZ-8*SZREG(sp) REG_L s4,O32_FRAMESZ-7*SZREG(sp) REG_L s5,O32_FRAMESZ-6*SZREG(sp) REG_L s6,O32_FRAMESZ-5*SZREG(sp) REG_L s7,O32_FRAMESZ-4*SZREG(sp) REG_L gp,O32_FRAMESZ-3*SZREG(sp) REG_L fp,O32_FRAMESZ-2*SZREG(sp) REG_L ra,O32_FRAMESZ-1*SZREG(sp) REG_ADDU sp,O32_FRAMESZ jr ra END(call_o32) |