From: Rui Ueyama <ruiu@bluewhale.systems>
To: Nelson Chu <nelson@rivosinc.com>
Cc: Rui Ueyama <rui314@gmail.com>, binutils@sourceware.org
Subject: Re: [PATCH v2] RISC-V: emit R_RISCV_RELAX for the la pseudo instruction
Date: Thu, 21 Sep 2023 14:32:37 +0900 [thread overview]
Message-ID: <CACf8vq8LkJXWwK176fd+nAbESGjWn9vkK2WNEyU462DBnGq3Vw@mail.gmail.com> (raw)
In-Reply-To: <CAPpQWtDCxYymBP2A4JOfx2h83JVDObGpix+PHSpKdUo7rNuBCA@mail.gmail.com>
Thank you for reviewing! I'll let you know when you can merge this
patch (i.e. when my proposal is ratified.)
Meanwhile, do I need to fill in the copyright assignment form?
On Thu, Sep 21, 2023 at 9:19 AM Nelson Chu <nelson@rivosinc.com> wrote:
>
> Looks good, thanks!
>
> Nelson
>
> On Wed, Sep 20, 2023 at 4:34 PM Rui Ueyama <rui314@gmail.com> wrote:
>>
>> Now the macro identifier is stored to tc_fix_data if a relocation
>> is created as a result of assembler macro expansion.
>>
>>
>> ---
>> gas/config/tc-riscv.c | 15 +++++++++++++++
>> gas/config/tc-riscv.h | 8 ++++++++
>> gas/testsuite/gas/riscv/la-variants.d | 3 +++
>> 3 files changed, 26 insertions(+)
>>
>> diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
>> index 3b520ad208b..c761b793afc 100644
>> --- a/gas/config/tc-riscv.c
>> +++ b/gas/config/tc-riscv.c
>> @@ -59,6 +59,9 @@ struct riscv_cl_insn
>> fixS *fixp;
>> };
>>
>> +/* The identifier of the assembler macro we are expanding, if any. */
>> +static int source_macro = -1;
>> +
>> /* All RISC-V CSR belong to one of these classes. */
>> enum riscv_csr_class
>> {
>> @@ -1659,6 +1662,7 @@ append_insn (struct riscv_cl_insn *ip, expressionS *address_expr,
>> address_expr, false, reloc_type);
>>
>> ip->fixp->fx_tcbit = riscv_opts.relax;
>> + ip->fixp->tc_fix_data.source_macro = source_macro;
>> }
>> }
>>
>> @@ -2020,6 +2024,8 @@ macro (struct riscv_cl_insn *ip, expressionS *imm_expr,
>> int rs2 = (ip->insn_opcode >> OP_SH_RS2) & OP_MASK_RS2;
>> int mask = ip->insn_mo->mask;
>>
>> + source_macro = mask;
>> +
>> switch (mask)
>> {
>> case M_LI:
>> @@ -2168,6 +2174,8 @@ macro (struct riscv_cl_insn *ip, expressionS *imm_expr,
>> as_bad (_("internal: macro %s not implemented"), ip->insn_mo->name);
>> break;
>> }
>> +
>> + source_macro = -1;
>> }
>>
>> static const struct percent_op_match percent_op_utype[] =
>> @@ -4049,6 +4057,13 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
>> break;
>>
>> case BFD_RELOC_RISCV_GOT_HI20:
>> + /* R_RISCV_GOT_HI20 and the following R_RISCV_LO12_I are relaxable
>> + only if it is created as a result of la or lga assembler macros. */
>> + if (fixP->tc_fix_data.source_macro == M_LA ||
>> + fixP->tc_fix_data.source_macro == M_LGA)
>> + relaxable = true;
>> + break;
>> +
>> case BFD_RELOC_RISCV_ADD8:
>> case BFD_RELOC_RISCV_ADD16:
>> case BFD_RELOC_RISCV_ADD32:
>> diff --git a/gas/config/tc-riscv.h b/gas/config/tc-riscv.h
>> index 0c70c7d4739..4fba3a07829 100644
>> --- a/gas/config/tc-riscv.h
>> +++ b/gas/config/tc-riscv.h
>> @@ -101,6 +101,14 @@ extern void riscv_pre_output_hook (void);
>> #define TC_FORCE_RELOCATION_LOCAL(FIX) 1
>> #define DIFF_EXPR_OK 1
>>
>> +struct riscv_fix
>> +{
>> + int source_macro;
>> +};
>> +
>> +#define TC_FIX_TYPE struct riscv_fix
>> +#define TC_INIT_FIX_DATA(FIX) (FIX)->tc_fix_data.source_macro = -1
>> +
>> extern void riscv_pop_insert (void);
>> #define md_pop_insert() riscv_pop_insert ()
>>
>> diff --git a/gas/testsuite/gas/riscv/la-variants.d b/gas/testsuite/gas/riscv/la-variants.d
>> index b1d316983b7..e8ac09c2af2 100644
>> --- a/gas/testsuite/gas/riscv/la-variants.d
>> +++ b/gas/testsuite/gas/riscv/la-variants.d
>> @@ -21,11 +21,13 @@ Disassembly of section .text:
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_RELAX[ ]+\*ABS\*
>> [ ]+[0-9a-f]+:[ ]+00000617[ ]+auipc[ ]+a2,0x0
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_GOT_HI20[ ]+a
>> +[ ]+[0-9a-f]+:[ ]+R_RISCV_RELAX[ ]+\*ABS\*
>> [ ]+[0-9a-f]+:[ ]+(00062603|00063603)[ ]+(lw|ld)[ ]+a2,0\(a2\).*
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_PCREL_LO12_I[ ]+\.L0[ ]+
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_RELAX[ ]+\*ABS\*
>> [ ]+[0-9a-f]+:[ ]+00000697[ ]+auipc[ ]+a3,0x0
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_GOT_HI20[ ]+a
>> +[ ]+[0-9a-f]+:[ ]+R_RISCV_RELAX[ ]+\*ABS\*
>> [ ]+[0-9a-f]+:[ ]+(0006a683|0006b683)[ ]+(lw|ld)[ ]+a3,0\(a3\).*
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_PCREL_LO12_I[ ]+\.L0[ ]+
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_RELAX[ ]+\*ABS\*
>> @@ -37,6 +39,7 @@ Disassembly of section .text:
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_RELAX[ ]+\*ABS\*
>> [ ]+[0-9a-f]+:[ ]+00000797[ ]+auipc[ ]+a5,0x0
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_GOT_HI20[ ]+a
>> +[ ]+[0-9a-f]+:[ ]+R_RISCV_RELAX[ ]+\*ABS\*
>> [ ]+[0-9a-f]+:[ ]+(0007a783|0007b783)[ ]+(lw|ld)[ ]+a5,0\(a5\).*
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_PCREL_LO12_I[ ]+\.L0[ ]+
>> [ ]+[0-9a-f]+:[ ]+R_RISCV_RELAX[ ]+\*ABS\*
>> --
>> 2.34.1
>>
next prev parent reply other threads:[~2023-09-21 5:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-19 7:01 [PATCH] " Rui Ueyama
2023-09-20 1:08 ` Nelson Chu
2023-09-20 8:31 ` [PATCH v2] " Rui Ueyama
2023-09-21 0:18 ` Nelson Chu
2023-09-21 5:32 ` Rui Ueyama [this message]
2023-09-21 7:37 ` Nelson Chu
2023-12-12 6:40 ` Rui Ueyama
2023-12-12 9:38 ` Nelson Chu
2023-12-12 9:25 ` Andreas Schwab
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