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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>
175 lines
5.3 KiB
C
175 lines
5.3 KiB
C
/*
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* include/asm-mips/dec/prom.h
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*
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* DECstation PROM interface.
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*
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* Copyright (C) 2002 Maciej W. Rozycki
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Based on arch/mips/dec/prom/prom.h by the Anonymous.
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*/
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#ifndef _ASM_DEC_PROM_H
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#define _ASM_DEC_PROM_H
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#include <linux/types.h>
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#include <asm/addrspace.h>
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/*
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* PMAX/3MAX PROM entry points for DS2100/3100's and DS5000/2xx's.
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* Many of these will work for MIPSen as well!
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*/
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#define VEC_RESET (u64 *)CKSEG1ADDR(0x1fc00000)
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/* Prom base address */
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#define PMAX_PROM_ENTRY(x) (VEC_RESET + (x)) /* Prom jump table */
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#define PMAX_PROM_HALT PMAX_PROM_ENTRY(2) /* valid on MIPSen */
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#define PMAX_PROM_AUTOBOOT PMAX_PROM_ENTRY(5) /* valid on MIPSen */
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#define PMAX_PROM_OPEN PMAX_PROM_ENTRY(6)
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#define PMAX_PROM_READ PMAX_PROM_ENTRY(7)
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#define PMAX_PROM_CLOSE PMAX_PROM_ENTRY(10)
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#define PMAX_PROM_LSEEK PMAX_PROM_ENTRY(11)
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#define PMAX_PROM_GETCHAR PMAX_PROM_ENTRY(12)
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#define PMAX_PROM_PUTCHAR PMAX_PROM_ENTRY(13) /* 12 on MIPSen */
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#define PMAX_PROM_GETS PMAX_PROM_ENTRY(15)
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#define PMAX_PROM_PRINTF PMAX_PROM_ENTRY(17)
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#define PMAX_PROM_GETENV PMAX_PROM_ENTRY(33) /* valid on MIPSen */
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/*
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* Magic number indicating REX PROM available on DECstation. Found in
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* register a2 on transfer of control to program from PROM.
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*/
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#define REX_PROM_MAGIC 0x30464354
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#ifdef CONFIG_64BIT
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#define prom_is_rex(magic) 1 /* KN04 and KN05 are REX PROMs. */
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#else /* !CONFIG_64BIT */
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#define prom_is_rex(magic) ((magic) == REX_PROM_MAGIC)
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#endif /* !CONFIG_64BIT */
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/*
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* 3MIN/MAXINE PROM entry points for DS5000/1xx's, DS5000/xx's and
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* DS5000/2x0.
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*/
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#define REX_PROM_GETBITMAP 0x84/4 /* get mem bitmap */
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#define REX_PROM_GETCHAR 0x24/4 /* getch() */
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#define REX_PROM_GETENV 0x64/4 /* get env. variable */
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#define REX_PROM_GETSYSID 0x80/4 /* get system id */
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#define REX_PROM_GETTCINFO 0xa4/4
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#define REX_PROM_PRINTF 0x30/4 /* printf() */
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#define REX_PROM_SLOTADDR 0x6c/4 /* slotaddr */
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#define REX_PROM_BOOTINIT 0x54/4 /* open() */
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#define REX_PROM_BOOTREAD 0x58/4 /* read() */
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#define REX_PROM_CLEARCACHE 0x7c/4
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/*
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* Used by rex_getbitmap().
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*/
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typedef struct {
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int pagesize;
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unsigned char bitmap[0];
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} memmap;
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/*
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* Function pointers as read from a PROM's callback vector.
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*/
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extern int (*__rex_bootinit)(void);
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extern int (*__rex_bootread)(void);
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extern int (*__rex_getbitmap)(memmap *);
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extern unsigned long *(*__rex_slot_address)(int);
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extern void *(*__rex_gettcinfo)(void);
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extern int (*__rex_getsysid)(void);
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extern void (*__rex_clear_cache)(void);
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extern int (*__prom_getchar)(void);
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extern char *(*__prom_getenv)(char *);
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extern int (*__prom_printf)(char *, ...);
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extern int (*__pmax_open)(char*, int);
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extern int (*__pmax_lseek)(int, long, int);
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extern int (*__pmax_read)(int, void *, int);
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extern int (*__pmax_close)(int);
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#ifdef CONFIG_64BIT
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/*
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* On MIPS64 we have to call PROM functions via a helper
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* dispatcher to accommodate ABI incompatibilities.
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*/
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#define __DEC_PROM_O32(fun, arg) fun arg __asm__(#fun); \
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__asm__(#fun " = call_o32")
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int __DEC_PROM_O32(_rex_bootinit, (int (*)(void), void *));
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int __DEC_PROM_O32(_rex_bootread, (int (*)(void), void *));
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int __DEC_PROM_O32(_rex_getbitmap, (int (*)(memmap *), void *, memmap *));
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unsigned long *__DEC_PROM_O32(_rex_slot_address,
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(unsigned long *(*)(int), void *, int));
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void *__DEC_PROM_O32(_rex_gettcinfo, (void *(*)(void), void *));
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int __DEC_PROM_O32(_rex_getsysid, (int (*)(void), void *));
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void __DEC_PROM_O32(_rex_clear_cache, (void (*)(void), void *));
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int __DEC_PROM_O32(_prom_getchar, (int (*)(void), void *));
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char *__DEC_PROM_O32(_prom_getenv, (char *(*)(char *), void *, char *));
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int __DEC_PROM_O32(_prom_printf, (int (*)(char *, ...), void *, char *, ...));
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#define rex_bootinit() _rex_bootinit(__rex_bootinit, NULL)
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#define rex_bootread() _rex_bootread(__rex_bootread, NULL)
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#define rex_getbitmap(x) _rex_getbitmap(__rex_getbitmap, NULL, x)
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#define rex_slot_address(x) _rex_slot_address(__rex_slot_address, NULL, x)
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#define rex_gettcinfo() _rex_gettcinfo(__rex_gettcinfo, NULL)
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#define rex_getsysid() _rex_getsysid(__rex_getsysid, NULL)
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#define rex_clear_cache() _rex_clear_cache(__rex_clear_cache, NULL)
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#define prom_getchar() _prom_getchar(__prom_getchar, NULL)
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#define prom_getenv(x) _prom_getenv(__prom_getenv, NULL, x)
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#define prom_printf(x...) _prom_printf(__prom_printf, NULL, x)
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#else /* !CONFIG_64BIT */
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/*
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* On plain MIPS we just call PROM functions directly.
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*/
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#define rex_bootinit __rex_bootinit
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#define rex_bootread __rex_bootread
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#define rex_getbitmap __rex_getbitmap
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#define rex_slot_address __rex_slot_address
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#define rex_gettcinfo __rex_gettcinfo
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#define rex_getsysid __rex_getsysid
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#define rex_clear_cache __rex_clear_cache
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#define prom_getchar __prom_getchar
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#define prom_getenv __prom_getenv
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#define prom_printf __prom_printf
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#define pmax_open __pmax_open
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#define pmax_lseek __pmax_lseek
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#define pmax_read __pmax_read
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#define pmax_close __pmax_close
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#endif /* !CONFIG_64BIT */
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extern void prom_meminit(u32);
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extern void prom_identify_arch(u32);
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extern void prom_init_cmdline(s32, s32 *, u32);
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extern void register_prom_console(void);
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extern void unregister_prom_console(void);
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#endif /* _ASM_DEC_PROM_H */
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