diff options
Diffstat (limited to 'arch/loongarch/kernel/inst.c')
| -rw-r--r-- | arch/loongarch/kernel/inst.c | 169 |
1 files changed, 167 insertions, 2 deletions
diff --git a/arch/loongarch/kernel/inst.c b/arch/loongarch/kernel/inst.c index 258ef267cd30..bf037f0c6b26 100644 --- a/arch/loongarch/kernel/inst.c +++ b/arch/loongarch/kernel/inst.c @@ -4,6 +4,8 @@ */ #include <linux/sizes.h> #include <linux/uaccess.h> +#include <linux/set_memory.h> +#include <linux/stop_machine.h> #include <asm/cacheflush.h> #include <asm/inst.h> @@ -133,6 +135,63 @@ void simu_branch(struct pt_regs *regs, union loongarch_instruction insn) } } +bool insns_not_supported(union loongarch_instruction insn) +{ + switch (insn.reg3_format.opcode) { + case amswapw_op ... ammindbdu_op: + pr_notice("atomic memory access instructions are not supported\n"); + return true; + case scq_op: + pr_notice("sc.q instruction is not supported\n"); + return true; + } + + switch (insn.reg2i14_format.opcode) { + case llw_op: + case lld_op: + case scw_op: + case scd_op: + pr_notice("ll and sc instructions are not supported\n"); + return true; + } + + switch (insn.reg2_format.opcode) { + case llacqw_op: + case llacqd_op: + case screlw_op: + case screld_op: + pr_notice("llacq and screl instructions are not supported\n"); + return true; + } + + switch (insn.reg1i21_format.opcode) { + case bceqz_op: + pr_notice("bceqz and bcnez instructions are not supported\n"); + return true; + } + + return false; +} + +bool insns_need_simulation(union loongarch_instruction insn) +{ + if (is_pc_ins(&insn)) + return true; + + if (is_branch_ins(&insn)) + return true; + + return false; +} + +void arch_simulate_insn(union loongarch_instruction insn, struct pt_regs *regs) +{ + if (is_pc_ins(&insn)) + simu_pc(regs, insn); + else if (is_branch_ins(&insn)) + simu_branch(regs, insn); +} + int larch_insn_read(void *addr, u32 *insnp) { int ret; @@ -173,6 +232,50 @@ int larch_insn_patch_text(void *addr, u32 insn) return ret; } +struct insn_copy { + void *dst; + void *src; + size_t len; + unsigned int cpu; +}; + +static int text_copy_cb(void *data) +{ + int ret = 0; + struct insn_copy *copy = data; + + if (smp_processor_id() == copy->cpu) { + ret = copy_to_kernel_nofault(copy->dst, copy->src, copy->len); + if (ret) + pr_err("%s: operation failed\n", __func__); + } + + flush_icache_range((unsigned long)copy->dst, (unsigned long)copy->dst + copy->len); + + return ret; +} + +int larch_insn_text_copy(void *dst, void *src, size_t len) +{ + int ret = 0; + size_t start, end; + struct insn_copy copy = { + .dst = dst, + .src = src, + .len = len, + .cpu = smp_processor_id(), + }; + + start = round_down((size_t)dst, PAGE_SIZE); + end = round_up((size_t)dst + len, PAGE_SIZE); + + set_memory_rw(start, (end - start) / PAGE_SIZE); + ret = stop_machine(text_copy_cb, ©, cpu_online_mask); + set_memory_rox(start, (end - start) / PAGE_SIZE); + + return ret; +} + u32 larch_insn_gen_nop(void) { return INSN_NOP; @@ -208,6 +311,20 @@ u32 larch_insn_gen_bl(unsigned long pc, unsigned long dest) return insn.word; } +u32 larch_insn_gen_break(int imm) +{ + union loongarch_instruction insn; + + if (imm < 0 || imm >= SZ_32K) { + pr_warn("The generated break instruction is out of range.\n"); + return INSN_BREAK; + } + + emit_break(&insn, imm); + + return insn.word; +} + u32 larch_insn_gen_or(enum loongarch_gpr rd, enum loongarch_gpr rj, enum loongarch_gpr rk) { union loongarch_instruction insn; @@ -226,6 +343,11 @@ u32 larch_insn_gen_lu12iw(enum loongarch_gpr rd, int imm) { union loongarch_instruction insn; + if (imm < -SZ_512K || imm >= SZ_512K) { + pr_warn("The generated lu12i.w instruction is out of range.\n"); + return INSN_BREAK; + } + emit_lu12iw(&insn, rd, imm); return insn.word; @@ -235,6 +357,11 @@ u32 larch_insn_gen_lu32id(enum loongarch_gpr rd, int imm) { union loongarch_instruction insn; + if (imm < -SZ_512K || imm >= SZ_512K) { + pr_warn("The generated lu32i.d instruction is out of range.\n"); + return INSN_BREAK; + } + emit_lu32id(&insn, rd, imm); return insn.word; @@ -244,16 +371,54 @@ u32 larch_insn_gen_lu52id(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm) { union loongarch_instruction insn; + if (imm < -SZ_2K || imm >= SZ_2K) { + pr_warn("The generated lu52i.d instruction is out of range.\n"); + return INSN_BREAK; + } + emit_lu52id(&insn, rd, rj, imm); return insn.word; } -u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, unsigned long pc, unsigned long dest) +u32 larch_insn_gen_beq(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm) +{ + union loongarch_instruction insn; + + if ((imm & 3) || imm < -SZ_128K || imm >= SZ_128K) { + pr_warn("The generated beq instruction is out of range.\n"); + return INSN_BREAK; + } + + emit_beq(&insn, rj, rd, imm >> 2); + + return insn.word; +} + +u32 larch_insn_gen_bne(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm) { union loongarch_instruction insn; - emit_jirl(&insn, rj, rd, (dest - pc) >> 2); + if ((imm & 3) || imm < -SZ_128K || imm >= SZ_128K) { + pr_warn("The generated bne instruction is out of range.\n"); + return INSN_BREAK; + } + + emit_bne(&insn, rj, rd, imm >> 2); + + return insn.word; +} + +u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm) +{ + union loongarch_instruction insn; + + if ((imm & 3) || imm < -SZ_128K || imm >= SZ_128K) { + pr_warn("The generated jirl instruction is out of range.\n"); + return INSN_BREAK; + } + + emit_jirl(&insn, rd, rj, imm >> 2); return insn.word; } |