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6c22c98637
We have some inline assemblies where the extable entry points to a label at the end of an inline assembly which is not followed by an instruction. On the other hand we have also inline assemblies where the extable entry points to the first instruction of an inline assembly. If a first type inline asm (extable point to empty label at the end) would be directly followed by a second type inline asm (extable points to first instruction) then we would have two different extable entries that point to the same instruction but would have a different target address. This can lead to quite random behaviour, depending on sorting order. I verified that we currently do not have such collisions within the kernel. However to avoid such subtle bugs add a couple of nop instructions to those inline assemblies which contain an extable that points to an empty label. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
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* s390 diagnose functions
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*
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* Copyright IBM Corp. 2007
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* Author(s): Michael Holzheu <holzheu@de.ibm.com>
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*/
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#ifndef _ASM_S390_DIAG_H
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#define _ASM_S390_DIAG_H
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#include <linux/percpu.h>
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enum diag_stat_enum {
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DIAG_STAT_X008,
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DIAG_STAT_X00C,
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DIAG_STAT_X010,
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DIAG_STAT_X014,
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DIAG_STAT_X044,
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DIAG_STAT_X064,
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DIAG_STAT_X09C,
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DIAG_STAT_X0DC,
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DIAG_STAT_X204,
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DIAG_STAT_X210,
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DIAG_STAT_X224,
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DIAG_STAT_X250,
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DIAG_STAT_X258,
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DIAG_STAT_X288,
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DIAG_STAT_X2C4,
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DIAG_STAT_X2FC,
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DIAG_STAT_X304,
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DIAG_STAT_X308,
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DIAG_STAT_X500,
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NR_DIAG_STAT
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};
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void diag_stat_inc(enum diag_stat_enum nr);
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void diag_stat_inc_norecursion(enum diag_stat_enum nr);
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/*
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* Diagnose 10: Release page range
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*/
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static inline void diag10_range(unsigned long start_pfn, unsigned long num_pfn)
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{
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unsigned long start_addr, end_addr;
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start_addr = start_pfn << PAGE_SHIFT;
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end_addr = (start_pfn + num_pfn - 1) << PAGE_SHIFT;
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diag_stat_inc(DIAG_STAT_X010);
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asm volatile(
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"0: diag %0,%1,0x10\n"
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"1: nopr %%r7\n"
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EX_TABLE(0b, 1b)
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EX_TABLE(1b, 1b)
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: : "a" (start_addr), "a" (end_addr));
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}
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/*
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* Diagnose 14: Input spool file manipulation
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*/
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extern int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode);
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/*
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* Diagnose 210: Get information about a virtual device
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*/
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struct diag210 {
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u16 vrdcdvno; /* device number (input) */
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u16 vrdclen; /* data block length (input) */
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u8 vrdcvcla; /* virtual device class (output) */
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u8 vrdcvtyp; /* virtual device type (output) */
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u8 vrdcvsta; /* virtual device status (output) */
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u8 vrdcvfla; /* virtual device flags (output) */
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u8 vrdcrccl; /* real device class (output) */
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u8 vrdccrty; /* real device type (output) */
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u8 vrdccrmd; /* real device model (output) */
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u8 vrdccrft; /* real device feature (output) */
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} __attribute__((packed, aligned(4)));
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extern int diag210(struct diag210 *addr);
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#endif /* _ASM_S390_DIAG_H */
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