| /* |
| * 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 both of the above. */ |
| #define O32_FRAMESZ (4 * O32_ARGC + SZREG * O32_STATC) |
| |
| .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-a7 -- its first seven arguments |
| * and the stack -- remaining ones (up to O32_ARGC, including a1-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 thus both this dispatcher and the current stack |
| * have 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 |
| |
| sll a0,a1,zero |
| sll a1,a2,zero |
| sll a2,a3,zero |
| sll a3,a4,zero |
| sw a5,0x10(sp) |
| sw a6,0x14(sp) |
| sw a7,0x18(sp) |
| |
| PTR_LA t0,O32_FRAMESZ(sp) |
| PTR_LA t1,0x1c(sp) |
| li t2,O32_ARGC-7 |
| 1: |
| lw t3,(t0) |
| REG_ADDU t0,SZREG |
| sw t3,(t1) |
| REG_SUBU t2,1 |
| REG_ADDU t1,4 |
| bnez t2,1b |
| |
| jalr jp |
| |
| 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) |
