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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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f39a8c4a22
Add new exception table type which is able to handle register pairs. If an exception is recognized on such an instruction the specified register pair will be zeroed, and the specified error register will be modified so it contains -EFAULT, similar to the existing EX_TABLE_UA_LOAD_REG() macro. Link: https://lore.kernel.org/r/Y2J8RSW2khWLgpPo@osiris Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
92 lines
3.4 KiB
C
92 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_EXTABLE_H
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#define __ASM_EXTABLE_H
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#include <linux/stringify.h>
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#include <linux/bits.h>
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#include <asm/asm-const.h>
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#define EX_TYPE_NONE 0
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#define EX_TYPE_FIXUP 1
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#define EX_TYPE_BPF 2
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#define EX_TYPE_UA_STORE 3
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#define EX_TYPE_UA_LOAD_MEM 4
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#define EX_TYPE_UA_LOAD_REG 5
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#define EX_TYPE_UA_LOAD_REGPAIR 6
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#define EX_DATA_REG_ERR_SHIFT 0
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#define EX_DATA_REG_ERR GENMASK(3, 0)
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#define EX_DATA_REG_ADDR_SHIFT 4
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#define EX_DATA_REG_ADDR GENMASK(7, 4)
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#define EX_DATA_LEN_SHIFT 8
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#define EX_DATA_LEN GENMASK(11, 8)
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#define __EX_TABLE(_section, _fault, _target, _type) \
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stringify_in_c(.section _section,"a";) \
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stringify_in_c(.align 4;) \
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stringify_in_c(.long (_fault) - .;) \
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stringify_in_c(.long (_target) - .;) \
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stringify_in_c(.short (_type);) \
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stringify_in_c(.short 0;) \
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stringify_in_c(.previous)
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#define __EX_TABLE_UA(_section, _fault, _target, _type, _regerr, _regaddr, _len)\
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stringify_in_c(.section _section,"a";) \
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stringify_in_c(.align 4;) \
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stringify_in_c(.long (_fault) - .;) \
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stringify_in_c(.long (_target) - .;) \
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stringify_in_c(.short (_type);) \
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stringify_in_c(.macro extable_reg regerr, regaddr;) \
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stringify_in_c(.set .Lfound, 0;) \
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stringify_in_c(.set .Lcurr, 0;) \
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stringify_in_c(.irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;) \
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stringify_in_c( .ifc "\regerr", "%%r\rs";) \
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stringify_in_c( .set .Lfound, 1;) \
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stringify_in_c( .set .Lregerr, .Lcurr;) \
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stringify_in_c( .endif;) \
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stringify_in_c( .set .Lcurr, .Lcurr+1;) \
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stringify_in_c(.endr;) \
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stringify_in_c(.ifne (.Lfound != 1);) \
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stringify_in_c( .error "extable_reg: bad register argument1";) \
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stringify_in_c(.endif;) \
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stringify_in_c(.set .Lfound, 0;) \
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stringify_in_c(.set .Lcurr, 0;) \
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stringify_in_c(.irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;) \
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stringify_in_c( .ifc "\regaddr", "%%r\rs";) \
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stringify_in_c( .set .Lfound, 1;) \
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stringify_in_c( .set .Lregaddr, .Lcurr;) \
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stringify_in_c( .endif;) \
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stringify_in_c( .set .Lcurr, .Lcurr+1;) \
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stringify_in_c(.endr;) \
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stringify_in_c(.ifne (.Lfound != 1);) \
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stringify_in_c( .error "extable_reg: bad register argument2";) \
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stringify_in_c(.endif;) \
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stringify_in_c(.short .Lregerr << EX_DATA_REG_ERR_SHIFT | \
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.Lregaddr << EX_DATA_REG_ADDR_SHIFT | \
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_len << EX_DATA_LEN_SHIFT;) \
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stringify_in_c(.endm;) \
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stringify_in_c(extable_reg _regerr,_regaddr;) \
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stringify_in_c(.purgem extable_reg;) \
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stringify_in_c(.previous)
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#define EX_TABLE(_fault, _target) \
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__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FIXUP)
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#define EX_TABLE_AMODE31(_fault, _target) \
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__EX_TABLE(.amode31.ex_table, _fault, _target, EX_TYPE_FIXUP)
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#define EX_TABLE_UA_STORE(_fault, _target, _regerr) \
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__EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_STORE, _regerr, _regerr, 0)
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#define EX_TABLE_UA_LOAD_MEM(_fault, _target, _regerr, _regmem, _len) \
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__EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_MEM, _regerr, _regmem, _len)
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#define EX_TABLE_UA_LOAD_REG(_fault, _target, _regerr, _regzero) \
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__EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REG, _regerr, _regzero, 0)
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#define EX_TABLE_UA_LOAD_REGPAIR(_fault, _target, _regerr, _regzero) \
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__EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REGPAIR, _regerr, _regzero, 0)
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#endif /* __ASM_EXTABLE_H */
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