mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
824122a319
Commit 231a35d372 [[MIPS] RM: Collected
changes] broke DECstation support by introducing an incompatible copy of
arch/mips/dec/prom/call_o32.S in arch/mips/fw/lib/, built unconditionally.
The copy happens to land earlier of the two among the modules used in the
link and is therefore chosen for the DECstation rather than the intended
original. As a result random kernel data is corrupted because a pointer
to the "%s" formatted output template is used as a temporary stack pointer
rather than being passed down to prom_printf. This also explains why
prom_printf still works, up to a point -- the next argument is the actual
string to output so it works just fine as the output template until enough
kernel data has been corrupted to cause a crash.
This change adjusts the modified wrapper in arch/mips/fw/lib/call_o32.S to
let callers request no stack switching by passing a null temporary stack
pointer in $a1, reworks the DECstation callers to work with the updated
interface and removes the old copy from arch/mips/dec/prom/call_o32.S. A
few minor readability adjustments are included as well, most importantly
O32_SZREG is now used throughout where applicable rather than hardcoded
multiplies of 4 and $fp is used to access the argument save area as a more
usual register to operate the stack with rather than $s0.
Finally an update is made to the temporary stack space used by the SNI
platform to guarantee 8-byte alignment as per o32 requirements.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6668/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
109 lines
3.0 KiB
ArmAsm
109 lines
3.0 KiB
ArmAsm
/*
|
|
* O32 interface for the 64 (or N32) ABI.
|
|
*
|
|
* Copyright (C) 2002, 2014 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>
|
|
|
|
/* O32 register size. */
|
|
#define O32_SZREG 4
|
|
/* Maximum number of arguments supported. Must be even! */
|
|
#define O32_ARGC 32
|
|
/* Number of static registers we save. */
|
|
#define O32_STATC 11
|
|
/* Argument area frame size. */
|
|
#define O32_ARGSZ (O32_SZREG * O32_ARGC)
|
|
/* Static register save area frame size. */
|
|
#define O32_STATSZ (SZREG * O32_STATC)
|
|
/* Stack pointer register save area frame size. */
|
|
#define O32_SPSZ SZREG
|
|
/* Combined area frame size. */
|
|
#define O32_FRAMESZ (O32_ARGSZ + O32_SPSZ + O32_STATSZ)
|
|
/* Switched stack frame size. */
|
|
#define O32_NFRAMESZ (O32_ARGSZ + O32_SPSZ)
|
|
|
|
.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 pointer to the new stack to call the
|
|
* function with or 0 if no stack switching is requested, a2-a7 -- the
|
|
* function call's first six arguments, and the stack -- the remaining
|
|
* arguments (up to O32_ARGC, including a2-a7). Static registers, gp
|
|
* and fp are preserved, v0 holds the 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
|
|
|
|
move fp,sp
|
|
beqz a1,0f
|
|
REG_SUBU fp,a1,O32_NFRAMESZ
|
|
0:
|
|
REG_S sp,O32_NFRAMESZ-1*SZREG(fp)
|
|
|
|
sll a0,a2,zero
|
|
sll a1,a3,zero
|
|
sll a2,a4,zero
|
|
sll a3,a5,zero
|
|
sw a6,4*O32_SZREG(fp)
|
|
sw a7,5*O32_SZREG(fp)
|
|
|
|
PTR_LA t0,O32_FRAMESZ(sp)
|
|
PTR_LA t1,6*O32_SZREG(fp)
|
|
li t2,O32_ARGC-6
|
|
1:
|
|
lw t3,(t0)
|
|
REG_ADDU t0,SZREG
|
|
sw t3,(t1)
|
|
REG_SUBU t2,1
|
|
REG_ADDU t1,O32_SZREG
|
|
bnez t2,1b
|
|
|
|
move sp,fp
|
|
|
|
jalr jp
|
|
|
|
REG_L sp,O32_NFRAMESZ-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)
|