提交 520ad988 编写于 作者: A Anshuman Khandual 提交者: Catalin Marinas

arm64/cpufeatures: Factorize emulate_mrs()

MRS emulation gets triggered with exception class (0x00 or 0x18) eventually
calling the function emulate_mrs() which fetches the user space instruction
and analyses it's encodings (OP0, OP1, OP2, CRN, CRM, RT). The kernel tries
to emulate the given instruction looking into the encoding details. Going
forward these encodings can also be parsed from ESR_ELx.ISS fields without
requiring to fetch/decode faulting userspace instruction which can improve
performance. This factorizes emulate_mrs() function in a way that it can be
called directly with MRS encodings (OP0, OP1, OP2, CRN, CRM) for any given
target register which can then be used directly from 0x18 exception class.
Reviewed-by: NSuzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Signed-off-by: NAnshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
上级 1c839141
无相关合并请求
......@@ -536,6 +536,7 @@ void arm64_set_ssbd_mitigation(bool state);
static inline void arm64_set_ssbd_mitigation(bool state) {}
#endif
extern int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt);
#endif /* __ASSEMBLY__ */
#endif
......@@ -1844,27 +1844,32 @@ static int emulate_sys_reg(u32 id, u64 *valp)
return 0;
}
static int emulate_mrs(struct pt_regs *regs, u32 insn)
int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt)
{
int rc;
u32 sys_reg, dst;
u64 val;
/*
* sys_reg values are defined as used in mrs/msr instruction.
* shift the imm value to get the encoding.
*/
sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5;
rc = emulate_sys_reg(sys_reg, &val);
if (!rc) {
dst = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn);
pt_regs_write_reg(regs, dst, val);
pt_regs_write_reg(regs, rt, val);
arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
}
return rc;
}
static int emulate_mrs(struct pt_regs *regs, u32 insn)
{
u32 sys_reg, rt;
/*
* sys_reg values are defined as used in mrs/msr instruction.
* shift the imm value to get the encoding.
*/
sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5;
rt = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn);
return do_emulate_mrs(regs, sys_reg, rt);
}
static struct undef_hook mrs_hook = {
.instr_mask = 0xfff00000,
.instr_val = 0xd5300000,
......
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