2 * O32 interface for the 64 (or N32) ABI.
4 * Copyright (C) 2002 Maciej W. Rozycki
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #include <asm/regdef.h>
15 /* Maximum number of arguments supported. Must be even! */
17 /* Number of static registers we save. */
19 /* Frame size for both of the above. */
20 #define O32_FRAMESZ (4 * O32_ARGC + SZREG * O32_STATC)
25 * O32 function call dispatcher, for interfacing 32-bit ROM routines.
27 * The standard 64 (N32) calling sequence is supported, with a0
28 * holding a function pointer, a1-a7 -- its first seven arguments
29 * and the stack -- remaining ones (up to O32_ARGC, including a1-a7).
30 * Static registers, gp and fp are preserved, v0 holds a result.
31 * This code relies on the called o32 function for sp and ra
32 * restoration and thus both this dispatcher and the current stack
33 * have to be placed in a KSEGx (or KUSEG) address space. Any
34 * pointers passed have to point to addresses within one of these
37 NESTED(call_o32, O32_FRAMESZ, ra)
38 REG_SUBU sp,O32_FRAMESZ
40 REG_S ra,O32_FRAMESZ-1*SZREG(sp)
41 REG_S fp,O32_FRAMESZ-2*SZREG(sp)
42 REG_S gp,O32_FRAMESZ-3*SZREG(sp)
43 REG_S s7,O32_FRAMESZ-4*SZREG(sp)
44 REG_S s6,O32_FRAMESZ-5*SZREG(sp)
45 REG_S s5,O32_FRAMESZ-6*SZREG(sp)
46 REG_S s4,O32_FRAMESZ-7*SZREG(sp)
47 REG_S s3,O32_FRAMESZ-8*SZREG(sp)
48 REG_S s2,O32_FRAMESZ-9*SZREG(sp)
49 REG_S s1,O32_FRAMESZ-10*SZREG(sp)
50 REG_S s0,O32_FRAMESZ-11*SZREG(sp)
62 PTR_LA t0,O32_FRAMESZ(sp)
75 REG_L s0,O32_FRAMESZ-11*SZREG(sp)
76 REG_L s1,O32_FRAMESZ-10*SZREG(sp)
77 REG_L s2,O32_FRAMESZ-9*SZREG(sp)
78 REG_L s3,O32_FRAMESZ-8*SZREG(sp)
79 REG_L s4,O32_FRAMESZ-7*SZREG(sp)
80 REG_L s5,O32_FRAMESZ-6*SZREG(sp)
81 REG_L s6,O32_FRAMESZ-5*SZREG(sp)
82 REG_L s7,O32_FRAMESZ-4*SZREG(sp)
83 REG_L gp,O32_FRAMESZ-3*SZREG(sp)
84 REG_L fp,O32_FRAMESZ-2*SZREG(sp)
85 REG_L ra,O32_FRAMESZ-1*SZREG(sp)
87 REG_ADDU sp,O32_FRAMESZ