projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 231a35d3 | 2 | /* |
| 231a35d3 TB |
3 | * O32 interface for the 64 (or N32) ABI. |
| 4 | * | |
| 824122a3 | 5 | * Copyright (C) 2002, 2014 Maciej W. Rozycki |
| 231a35d3 TB |
6 | */ |
| 7 | ||
| 8 | #include <asm/asm.h> | |
| 9 | #include <asm/regdef.h> | |
| 10 | ||
| 824122a3 MR |
11 | /* O32 register size. */ |
| 12 | #define O32_SZREG 4 | |
| 231a35d3 TB |
13 | /* Maximum number of arguments supported. Must be even! */ |
| 14 | #define O32_ARGC 32 | |
| 824122a3 | 15 | /* Number of static registers we save. */ |
| 231a35d3 | 16 | #define O32_STATC 11 |
| 824122a3 MR |
17 | /* Argument area frame size. */ |
| 18 | #define O32_ARGSZ (O32_SZREG * O32_ARGC) | |
| 19 | /* Static register save area frame size. */ | |
| 20 | #define O32_STATSZ (SZREG * O32_STATC) | |
| 21 | /* Stack pointer register save area frame size. */ | |
| 22 | #define O32_SPSZ SZREG | |
| 23 | /* Combined area frame size. */ | |
| 24 | #define O32_FRAMESZ (O32_ARGSZ + O32_SPSZ + O32_STATSZ) | |
| 25 | /* Switched stack frame size. */ | |
| 26 | #define O32_NFRAMESZ (O32_ARGSZ + O32_SPSZ) | |
| 231a35d3 TB |
27 | |
| 28 | .text | |
| 29 | ||
| 30 | /* | |
| 31 | * O32 function call dispatcher, for interfacing 32-bit ROM routines. | |
| 32 | * | |
| 824122a3 MR |
33 | * The standard 64 (N32) calling sequence is supported, with a0 holding |
| 34 | * a function pointer, a1 a pointer to the new stack to call the | |
| 35 | * function with or 0 if no stack switching is requested, a2-a7 -- the | |
| 36 | * function call's first six arguments, and the stack -- the remaining | |
| 37 | * arguments (up to O32_ARGC, including a2-a7). Static registers, gp | |
| 38 | * and fp are preserved, v0 holds the result. This code relies on the | |
| 39 | * called o32 function for sp and ra restoration and this dispatcher has | |
| 40 | * to be placed in a KSEGx (or KUSEG) address space. Any pointers | |
| 41 | * passed have to point to addresses within one of these spaces as well. | |
| 231a35d3 TB |
42 | */ |
| 43 | NESTED(call_o32, O32_FRAMESZ, ra) | |
| 44 | REG_SUBU sp,O32_FRAMESZ | |
| 45 | ||
| 46 | REG_S ra,O32_FRAMESZ-1*SZREG(sp) | |
| 47 | REG_S fp,O32_FRAMESZ-2*SZREG(sp) | |
| 48 | REG_S gp,O32_FRAMESZ-3*SZREG(sp) | |
| 49 | REG_S s7,O32_FRAMESZ-4*SZREG(sp) | |
| 50 | REG_S s6,O32_FRAMESZ-5*SZREG(sp) | |
| 51 | REG_S s5,O32_FRAMESZ-6*SZREG(sp) | |
| 52 | REG_S s4,O32_FRAMESZ-7*SZREG(sp) | |
| 53 | REG_S s3,O32_FRAMESZ-8*SZREG(sp) | |
| 54 | REG_S s2,O32_FRAMESZ-9*SZREG(sp) | |
| 55 | REG_S s1,O32_FRAMESZ-10*SZREG(sp) | |
| 56 | REG_S s0,O32_FRAMESZ-11*SZREG(sp) | |
| 57 | ||
| 58 | move jp,a0 | |
| 824122a3 MR |
59 | |
| 60 | move fp,sp | |
| 61 | beqz a1,0f | |
| 62 | REG_SUBU fp,a1,O32_NFRAMESZ | |
| 63 | 0: | |
| 64 | REG_S sp,O32_NFRAMESZ-1*SZREG(fp) | |
| 231a35d3 TB |
65 | |
| 66 | sll a0,a2,zero | |
| 67 | sll a1,a3,zero | |
| 68 | sll a2,a4,zero | |
| 69 | sll a3,a5,zero | |
| 824122a3 MR |
70 | sw a6,4*O32_SZREG(fp) |
| 71 | sw a7,5*O32_SZREG(fp) | |
| 231a35d3 TB |
72 | |
| 73 | PTR_LA t0,O32_FRAMESZ(sp) | |
| 824122a3 | 74 | PTR_LA t1,6*O32_SZREG(fp) |
| 231a35d3 TB |
75 | li t2,O32_ARGC-6 |
| 76 | 1: | |
| 77 | lw t3,(t0) | |
| 78 | REG_ADDU t0,SZREG | |
| 79 | sw t3,(t1) | |
| 80 | REG_SUBU t2,1 | |
| 824122a3 | 81 | REG_ADDU t1,O32_SZREG |
| 231a35d3 TB |
82 | bnez t2,1b |
| 83 | ||
| 824122a3 | 84 | move sp,fp |
| 231a35d3 TB |
85 | |
| 86 | jalr jp | |
| 87 | ||
| 824122a3 | 88 | REG_L sp,O32_NFRAMESZ-1*SZREG(sp) |
| 231a35d3 TB |
89 | |
| 90 | REG_L s0,O32_FRAMESZ-11*SZREG(sp) | |
| 91 | REG_L s1,O32_FRAMESZ-10*SZREG(sp) | |
| 92 | REG_L s2,O32_FRAMESZ-9*SZREG(sp) | |
| 93 | REG_L s3,O32_FRAMESZ-8*SZREG(sp) | |
| 94 | REG_L s4,O32_FRAMESZ-7*SZREG(sp) | |
| 95 | REG_L s5,O32_FRAMESZ-6*SZREG(sp) | |
| 96 | REG_L s6,O32_FRAMESZ-5*SZREG(sp) | |
| 97 | REG_L s7,O32_FRAMESZ-4*SZREG(sp) | |
| 98 | REG_L gp,O32_FRAMESZ-3*SZREG(sp) | |
| 99 | REG_L fp,O32_FRAMESZ-2*SZREG(sp) | |
| 100 | REG_L ra,O32_FRAMESZ-1*SZREG(sp) | |
| 101 | ||
| 102 | REG_ADDU sp,O32_FRAMESZ | |
| 103 | jr ra | |
| 104 | END(call_o32) |