diff options
Diffstat (limited to 'arch/loongarch/mm/extable.c')
| -rw-r--r-- | arch/loongarch/mm/extable.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/loongarch/mm/extable.c b/arch/loongarch/mm/extable.c index fd2395221cff..9b0cfd898940 100644 --- a/arch/loongarch/mm/extable.c +++ b/arch/loongarch/mm/extable.c @@ -2,6 +2,7 @@ /* * Copyright (C) 2020-2022 Loongson Technology Corporation Limited */ +#include <linux/bitfield.h> #include <linux/extable.h> #include <linux/uaccess.h> #include <asm/asm-extable.h> @@ -13,6 +14,13 @@ get_ex_fixup(const struct exception_table_entry *ex) return ((unsigned long)&ex->fixup + ex->fixup); } +static inline void regs_set_gpr(struct pt_regs *regs, + unsigned int offset, unsigned long val) +{ + if (offset && offset <= MAX_REG_OFFSET) + *(unsigned long *)((unsigned long)regs + offset) = val; +} + static bool ex_handler_fixup(const struct exception_table_entry *ex, struct pt_regs *regs) { @@ -21,6 +29,18 @@ static bool ex_handler_fixup(const struct exception_table_entry *ex, return true; } +static bool ex_handler_uaccess_err_zero(const struct exception_table_entry *ex, + struct pt_regs *regs) +{ + int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data); + int reg_zero = FIELD_GET(EX_DATA_REG_ZERO, ex->data); + + regs_set_gpr(regs, reg_err * sizeof(unsigned long), -EFAULT); + regs_set_gpr(regs, reg_zero * sizeof(unsigned long), 0); + regs->csr_era = get_ex_fixup(ex); + + return true; +} bool fixup_exception(struct pt_regs *regs) { @@ -33,6 +53,8 @@ bool fixup_exception(struct pt_regs *regs) switch (ex->type) { case EX_TYPE_FIXUP: return ex_handler_fixup(ex, regs); + case EX_TYPE_UACCESS_ERR_ZERO: + return ex_handler_uaccess_err_zero(ex, regs); } BUG(); |