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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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34060b8fff
Add accurate exception reporting in M7memcpy Signed-off-by: Babu Moger <babu.moger@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
52 lines
1017 B
ArmAsm
52 lines
1017 B
ArmAsm
/*
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* M7copy_to_user.S: SPARC M7 optimized copy to userspace.
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*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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*/
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#define EX_ST(x, y) \
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98: x; \
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.section __ex_table,"a"; \
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.align 4; \
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.word 98b, y; \
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.text; \
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.align 4;
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#define EX_ST_FP(x, y) \
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98: x; \
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.section __ex_table,"a"; \
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.align 4; \
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.word 98b, y##_fp; \
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.text; \
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.align 4;
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#ifndef ASI_AIUS
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#define ASI_AIUS 0x11
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#endif
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#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
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#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
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#endif
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#define FUNC_NAME M7copy_to_user
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#define STORE(type,src,addr) type##a src, [addr] %asi
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#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS
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#define STORE_MRU_ASI ASI_ST_BLKINIT_MRU_S
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#define EX_RETVAL(x) 0
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#ifdef __KERNEL__
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/* Writing to %asi is _expensive_ so we hardcode it.
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* Reading %asi to check for KERNEL_DS is comparatively
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* cheap.
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*/
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#define PREAMBLE \
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rd %asi, %g1; \
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cmp %g1, ASI_AIUS; \
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bne,pn %icc, raw_copy_in_user; \
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nop
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#endif
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#include "M7memcpy.S"
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