[PATCH bpf-next v3 2/3] MIPS: uasm: Add signed div/mod emitters
From: Nicholas Dudar
Date: Mon Aug 10 2026 - 15:49:16 EST
Add uasm emitters for the signed DIV, MOD, DDIV, and DMOD
instructions. Provide both pre-R6 and R6 division forms so users can
select the instruction appropriate for the target ISA.
Assisted-by: Codex:gpt-5.6-sol
Link: https://lore.kernel.org/bpf/CAM1=_QS79dDBfaaNQXnWd61AqHd1M4o9aDMMiftnoJveNr=FZg@xxxxxxxxxxxxxx/
Signed-off-by: Nicholas Dudar <main.kalliope@xxxxxxxxx>
---
arch/mips/include/asm/uasm.h | 6 ++++++
arch/mips/mm/uasm-mips.c | 10 ++++++++++
arch/mips/mm/uasm.c | 20 ++++++++++++++------
3 files changed, 30 insertions(+), 6 deletions(-)
diff --git a/arch/mips/include/asm/uasm.h b/arch/mips/include/asm/uasm.h
index b43bfd445252..9d3edb59efc0 100644
--- a/arch/mips/include/asm/uasm.h
+++ b/arch/mips/include/asm/uasm.h
@@ -85,15 +85,20 @@ Ip_u1u2(_ctc1);
Ip_u2u1(_ctcmsa);
Ip_u2u1s3(_daddiu);
Ip_u3u1u2(_daddu);
+Ip_u1u2(_ddiv);
+Ip_u3u1u2(_ddiv_r6);
Ip_u1u2(_ddivu);
Ip_u3u1u2(_ddivu_r6);
Ip_u1(_di);
Ip_u2u1msbu3(_dins);
Ip_u2u1msbu3(_dinsm);
Ip_u2u1msbu3(_dinsu);
+Ip_u1u2(_div);
+Ip_u3u1u2(_div_r6);
Ip_u1u2(_divu);
Ip_u3u1u2(_divu_r6);
Ip_u1u2u3(_dmfc0);
+Ip_u3u1u2(_dmod);
Ip_u3u1u2(_dmodu);
Ip_u1u2u3(_dmtc0);
Ip_u1u2(_dmultu);
@@ -135,6 +140,7 @@ Ip_u1u2u3(_mfc0);
Ip_u1u2u3(_mfhc0);
Ip_u1(_mfhi);
Ip_u1(_mflo);
+Ip_u3u1u2(_mod);
Ip_u3u1u2(_modu);
Ip_u3u1u2(_movn);
Ip_u3u1u2(_movz);
diff --git a/arch/mips/mm/uasm-mips.c b/arch/mips/mm/uasm-mips.c
index e15c6700cd08..ef1a2b040070 100644
--- a/arch/mips/mm/uasm-mips.c
+++ b/arch/mips/mm/uasm-mips.c
@@ -75,6 +75,9 @@ static const struct insn insn_table[insn_invalid] = {
[insn_ctcmsa] = {M(msa_op, 0, msa_ctc_op, 0, 0, msa_elm_op), RD | RE},
[insn_daddiu] = {M(daddiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
[insn_daddu] = {M(spec_op, 0, 0, 0, 0, daddu_op), RS | RT | RD},
+ [insn_ddiv] = {M(spec_op, 0, 0, 0, 0, ddiv_op), RS | RT},
+ [insn_ddiv_r6] = {M(spec_op, 0, 0, 0, ddiv_ddiv6_op, ddiv_op),
+ RS | RT | RD},
[insn_ddivu] = {M(spec_op, 0, 0, 0, 0, ddivu_op), RS | RT},
[insn_ddivu_r6] = {M(spec_op, 0, 0, 0, ddivu_ddivu6_op, ddivu_op),
RS | RT | RD},
@@ -82,10 +85,15 @@ static const struct insn insn_table[insn_invalid] = {
[insn_dins] = {M(spec3_op, 0, 0, 0, 0, dins_op), RS | RT | RD | RE},
[insn_dinsm] = {M(spec3_op, 0, 0, 0, 0, dinsm_op), RS | RT | RD | RE},
[insn_dinsu] = {M(spec3_op, 0, 0, 0, 0, dinsu_op), RS | RT | RD | RE},
+ [insn_div] = {M(spec_op, 0, 0, 0, 0, div_op), RS | RT},
+ [insn_div_r6] = {M(spec_op, 0, 0, 0, div_div6_op, div_op),
+ RS | RT | RD},
[insn_divu] = {M(spec_op, 0, 0, 0, 0, divu_op), RS | RT},
[insn_divu_r6] = {M(spec_op, 0, 0, 0, divu_divu6_op, divu_op),
RS | RT | RD},
[insn_dmfc0] = {M(cop0_op, dmfc_op, 0, 0, 0, 0), RT | RD | SET},
+ [insn_dmod] = {M(spec_op, 0, 0, 0, ddiv_dmod_op, ddiv_op),
+ RS | RT | RD},
[insn_dmodu] = {M(spec_op, 0, 0, 0, ddivu_dmodu_op, ddivu_op),
RS | RT | RD},
[insn_dmtc0] = {M(cop0_op, dmtc_op, 0, 0, 0, 0), RT | RD | SET},
@@ -140,6 +148,8 @@ static const struct insn insn_table[insn_invalid] = {
[insn_mfhc0] = {M(cop0_op, mfhc0_op, 0, 0, 0, 0), RT | RD | SET},
[insn_mfhi] = {M(spec_op, 0, 0, 0, 0, mfhi_op), RD},
[insn_mflo] = {M(spec_op, 0, 0, 0, 0, mflo_op), RD},
+ [insn_mod] = {M(spec_op, 0, 0, 0, div_mod_op, div_op),
+ RS | RT | RD},
[insn_modu] = {M(spec_op, 0, 0, 0, divu_modu_op, divu_op),
RS | RT | RD},
[insn_movn] = {M(spec_op, 0, 0, 0, 0, movn_op), RS | RT | RD},
diff --git a/arch/mips/mm/uasm.c b/arch/mips/mm/uasm.c
index 125140979d62..06d722665451 100644
--- a/arch/mips/mm/uasm.c
+++ b/arch/mips/mm/uasm.c
@@ -49,18 +49,20 @@ enum opcode {
insn_addiu, insn_addu, insn_and, insn_andi, insn_bbit0, insn_bbit1,
insn_beq, insn_beql, insn_bgez, insn_bgezl, insn_bgtz, insn_blez,
insn_bltz, insn_bltzl, insn_bne, insn_break, insn_cache, insn_cfc1,
- insn_cfcmsa, insn_ctc1, insn_ctcmsa, insn_daddiu, insn_daddu, insn_ddivu,
- insn_ddivu_r6, insn_di, insn_dins, insn_dinsm, insn_dinsu, insn_divu,
- insn_divu_r6, insn_dmfc0, insn_dmodu, insn_dmtc0, insn_dmultu,
+ insn_cfcmsa, insn_ctc1, insn_ctcmsa, insn_daddiu, insn_daddu, insn_ddiv,
+ insn_ddiv_r6, insn_ddivu, insn_ddivu_r6, insn_di, insn_dins, insn_dinsm,
+ insn_dinsu, insn_div, insn_div_r6, insn_divu, insn_divu_r6, insn_dmfc0,
+ insn_dmod, insn_dmodu, insn_dmtc0, insn_dmultu,
insn_dmulu, insn_drotr, insn_drotr32, insn_dsbh, insn_dshd, insn_dsll,
insn_dsll32, insn_dsllv, insn_dsra, insn_dsra32, insn_dsrav, insn_dsrl,
insn_dsrl32, insn_dsrlv, insn_dsubu, insn_eret, insn_ext, insn_ins,
insn_j, insn_jal, insn_jalr, insn_jr, insn_lb, insn_lbu, insn_ld,
insn_lddir, insn_ldpte, insn_ldx, insn_lh, insn_lhu, insn_ll, insn_lld,
insn_lui, insn_lw, insn_lwu, insn_lwx, insn_mfc0, insn_mfhc0, insn_mfhi,
- insn_mflo, insn_modu, insn_movn, insn_movz, insn_mtc0, insn_mthc0,
- insn_mthi, insn_mtlo, insn_mul, insn_multu, insn_mulu, insn_muhu, insn_nor,
- insn_or, insn_ori, insn_pref, insn_rfe, insn_rotr, insn_sb, insn_sc,
+ insn_mflo, insn_mod, insn_modu, insn_movn, insn_movz, insn_mtc0,
+ insn_mthc0, insn_mthi, insn_mtlo, insn_mul, insn_multu, insn_mulu,
+ insn_muhu, insn_nor, insn_or, insn_ori, insn_pref, insn_rfe, insn_rotr,
+ insn_sb, insn_sc,
insn_scd, insn_seleqz, insn_selnez, insn_sd, insn_sh, insn_sll,
insn_sllv, insn_slt, insn_slti, insn_sltiu, insn_sltu, insn_sra,
insn_srav, insn_srl, insn_srlv, insn_subu, insn_sw, insn_sync,
@@ -287,9 +289,12 @@ I_u1u2(_cfc1)
I_u2u1(_cfcmsa)
I_u1u2(_ctc1)
I_u2u1(_ctcmsa)
+I_u1u2(_ddiv)
+I_u3u1u2(_ddiv_r6)
I_u1u2(_ddivu)
I_u3u1u2(_ddivu_r6)
I_u1u2u3(_dmfc0)
+I_u3u1u2(_dmod)
I_u3u1u2(_dmodu)
I_u1u2u3(_dmtc0)
I_u1u2(_dmultu)
@@ -297,6 +302,8 @@ I_u3u1u2(_dmulu)
I_u2u1s3(_daddiu)
I_u3u1u2(_daddu)
I_u1(_di);
+I_u1u2(_div)
+I_u3u1u2(_div_r6)
I_u1u2(_divu)
I_u3u1u2(_divu_r6)
I_u2u1(_dsbh);
@@ -332,6 +339,7 @@ I_u2s3u1(_lw)
I_u2s3u1(_lwu)
I_u1u2u3(_mfc0)
I_u1u2u3(_mfhc0)
+I_u3u1u2(_mod)
I_u3u1u2(_modu)
I_u3u1u2(_movn)
I_u3u1u2(_movz)