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104 lines
2.8 KiB
104 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* O32 interface for the 64 (or N32) ABI. |
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* |
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* Copyright (C) 2002, 2014 Maciej W. Rozycki |
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*/ |
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#include <asm/asm.h> |
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#include <asm/regdef.h> |
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/* O32 register size. */ |
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#define O32_SZREG 4 |
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/* Maximum number of arguments supported. Must be even! */ |
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#define O32_ARGC 32 |
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/* Number of static registers we save. */ |
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#define O32_STATC 11 |
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/* Argument area frame size. */ |
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#define O32_ARGSZ (O32_SZREG * O32_ARGC) |
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/* Static register save area frame size. */ |
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#define O32_STATSZ (SZREG * O32_STATC) |
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/* Stack pointer register save area frame size. */ |
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#define O32_SPSZ SZREG |
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/* Combined area frame size. */ |
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#define O32_FRAMESZ (O32_ARGSZ + O32_SPSZ + O32_STATSZ) |
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/* Switched stack frame size. */ |
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#define O32_NFRAMESZ (O32_ARGSZ + O32_SPSZ) |
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.text |
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/* |
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* O32 function call dispatcher, for interfacing 32-bit ROM routines. |
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* |
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* The standard 64 (N32) calling sequence is supported, with a0 holding |
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* a function pointer, a1 a pointer to the new stack to call the |
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* function with or 0 if no stack switching is requested, a2-a7 -- the |
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* function call's first six arguments, and the stack -- the remaining |
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* arguments (up to O32_ARGC, including a2-a7). Static registers, gp |
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* and fp are preserved, v0 holds the result. This code relies on the |
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* called o32 function for sp and ra restoration and this dispatcher has |
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* to be placed in a KSEGx (or KUSEG) address space. Any pointers |
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* passed have to point to addresses within one of these spaces as well. |
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*/ |
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NESTED(call_o32, O32_FRAMESZ, ra) |
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REG_SUBU sp,O32_FRAMESZ |
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REG_S ra,O32_FRAMESZ-1*SZREG(sp) |
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REG_S fp,O32_FRAMESZ-2*SZREG(sp) |
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REG_S gp,O32_FRAMESZ-3*SZREG(sp) |
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REG_S s7,O32_FRAMESZ-4*SZREG(sp) |
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REG_S s6,O32_FRAMESZ-5*SZREG(sp) |
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REG_S s5,O32_FRAMESZ-6*SZREG(sp) |
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REG_S s4,O32_FRAMESZ-7*SZREG(sp) |
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REG_S s3,O32_FRAMESZ-8*SZREG(sp) |
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REG_S s2,O32_FRAMESZ-9*SZREG(sp) |
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REG_S s1,O32_FRAMESZ-10*SZREG(sp) |
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REG_S s0,O32_FRAMESZ-11*SZREG(sp) |
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move jp,a0 |
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move fp,sp |
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beqz a1,0f |
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REG_SUBU fp,a1,O32_NFRAMESZ |
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0: |
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REG_S sp,O32_NFRAMESZ-1*SZREG(fp) |
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sll a0,a2,zero |
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sll a1,a3,zero |
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sll a2,a4,zero |
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sll a3,a5,zero |
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sw a6,4*O32_SZREG(fp) |
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sw a7,5*O32_SZREG(fp) |
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PTR_LA t0,O32_FRAMESZ(sp) |
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PTR_LA t1,6*O32_SZREG(fp) |
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li t2,O32_ARGC-6 |
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1: |
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lw t3,(t0) |
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REG_ADDU t0,SZREG |
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sw t3,(t1) |
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REG_SUBU t2,1 |
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REG_ADDU t1,O32_SZREG |
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bnez t2,1b |
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move sp,fp |
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jalr jp |
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REG_L sp,O32_NFRAMESZ-1*SZREG(sp) |
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REG_L s0,O32_FRAMESZ-11*SZREG(sp) |
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REG_L s1,O32_FRAMESZ-10*SZREG(sp) |
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REG_L s2,O32_FRAMESZ-9*SZREG(sp) |
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REG_L s3,O32_FRAMESZ-8*SZREG(sp) |
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REG_L s4,O32_FRAMESZ-7*SZREG(sp) |
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REG_L s5,O32_FRAMESZ-6*SZREG(sp) |
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REG_L s6,O32_FRAMESZ-5*SZREG(sp) |
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REG_L s7,O32_FRAMESZ-4*SZREG(sp) |
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REG_L gp,O32_FRAMESZ-3*SZREG(sp) |
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REG_L fp,O32_FRAMESZ-2*SZREG(sp) |
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REG_L ra,O32_FRAMESZ-1*SZREG(sp) |
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REG_ADDU sp,O32_FRAMESZ |
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jr ra |
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END(call_o32)
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