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Re: [PATCH v4 4/5] target/riscv: add fault-only-first unit stride load
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From: |
Richard Henderson |
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Subject: |
Re: [PATCH v4 4/5] target/riscv: add fault-only-first unit stride load |
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Date: |
Thu, 27 Feb 2020 12:03:53 -0800 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 |
On 2/25/20 2:35 AM, LIU Zhiwei wrote:
> +GEN_VEXT_LD_ELEM(vlbff_v_b, int8_t, int8_t, H1, ldsb)
> +GEN_VEXT_LD_ELEM(vlbff_v_h, int8_t, int16_t, H2, ldsb)
> +GEN_VEXT_LD_ELEM(vlbff_v_w, int8_t, int32_t, H4, ldsb)
> +GEN_VEXT_LD_ELEM(vlbff_v_d, int8_t, int64_t, H8, ldsb)
> +GEN_VEXT_LD_ELEM(vlhff_v_h, int16_t, int16_t, H2, ldsw)
> +GEN_VEXT_LD_ELEM(vlhff_v_w, int16_t, int32_t, H4, ldsw)
> +GEN_VEXT_LD_ELEM(vlhff_v_d, int16_t, int64_t, H8, ldsw)
> +GEN_VEXT_LD_ELEM(vlwff_v_w, int32_t, int32_t, H4, ldl)
> +GEN_VEXT_LD_ELEM(vlwff_v_d, int32_t, int64_t, H8, ldl)
> +GEN_VEXT_LD_ELEM(vleff_v_b, int8_t, int8_t, H1, ldsb)
> +GEN_VEXT_LD_ELEM(vleff_v_h, int16_t, int16_t, H2, ldsw)
> +GEN_VEXT_LD_ELEM(vleff_v_w, int32_t, int32_t, H4, ldl)
> +GEN_VEXT_LD_ELEM(vleff_v_d, int64_t, int64_t, H8, ldq)
> +GEN_VEXT_LD_ELEM(vlbuff_v_b, uint8_t, uint8_t, H1, ldub)
> +GEN_VEXT_LD_ELEM(vlbuff_v_h, uint8_t, uint16_t, H2, ldub)
> +GEN_VEXT_LD_ELEM(vlbuff_v_w, uint8_t, uint32_t, H4, ldub)
> +GEN_VEXT_LD_ELEM(vlbuff_v_d, uint8_t, uint64_t, H8, ldub)
> +GEN_VEXT_LD_ELEM(vlhuff_v_h, uint16_t, uint16_t, H2, lduw)
> +GEN_VEXT_LD_ELEM(vlhuff_v_w, uint16_t, uint32_t, H4, lduw)
> +GEN_VEXT_LD_ELEM(vlhuff_v_d, uint16_t, uint64_t, H8, lduw)
> +GEN_VEXT_LD_ELEM(vlwuff_v_w, uint32_t, uint32_t, H4, ldl)
> +GEN_VEXT_LD_ELEM(vlwuff_v_d, uint32_t, uint64_t, H8, ldl)
We definitely should not have a 3rd copy of these.
> + if (i == 0) {
> + probe_read_access(env, addr, nf * msz, ra);
> + } else {
> + /* if it triggles an exception, no need to check watchpoint */
triggers.
> + offset = -(addr | TARGET_PAGE_MASK);
> + remain = nf * msz;
> + while (remain > 0) {
> + host = tlb_vaddr_to_host(env, addr, MMU_DATA_LOAD, mmuidx);
> + if (host) {
> +#ifdef CONFIG_USER_ONLY
> + if (page_check_range(addr, nf * msz, PAGE_READ) < 0) {
> + vl = i;
> + goto ProbeSuccess;
> + }
> +#else
> + probe_read_access(env, addr, nf * msz, ra);
> +#endif
Good job finding all of the corner cases. I should invent a new cputlb
function that handles this better. For now, this is the best we can do.
r~