--- /dev/null
+From 9fbd18cf4c69f512f7de3ab73235078f3e32ecec Mon Sep 17 00:00:00 2001
+Date: Tue, 5 Aug 2025 19:00:18 +0800
+Subject: [PATCH 03/12] LoongArch: BPF: Add dynamic code modification support
+
+This commit adds support for BPF dynamic code modification on the
+LoongArch architecture:
+1. Add bpf_arch_text_copy() for instruction block copying.
+2. Add bpf_arch_text_poke() for runtime instruction patching.
+3. Add bpf_arch_text_invalidate() for code invalidation.
+
+On LoongArch, since symbol addresses in the direct mapping region can't
+be reached via relative jump instructions from the paged mapping region,
+we use the move_imm+jirl instruction pair as absolute jump instructions.
+These require 2-5 instructions, so we reserve 5 NOP instructions in the
+program as placeholders for function jumps.
+
+The larch_insn_text_copy() function is solely used for BPF. And the use
+of larch_insn_text_copy() requires PAGE_SIZE alignment. Currently, only
+the size of the BPF trampoline is page-aligned.
+
+---
+ arch/loongarch/include/asm/inst.h | 1 +
+ arch/loongarch/kernel/inst.c | 46 +++++++++++++
+ arch/loongarch/net/bpf_jit.c | 105 +++++++++++++++++++++++++++++-
+ 3 files changed, 151 insertions(+), 1 deletion(-)
+
+--- a/arch/loongarch/include/asm/inst.h
++++ b/arch/loongarch/include/asm/inst.h
+@@ -502,6 +502,7 @@ void arch_simulate_insn(union loongarch_
+ int larch_insn_read(void *addr, u32 *insnp);
+ int larch_insn_write(void *addr, u32 insn);
+ int larch_insn_patch_text(void *addr, u32 insn);
++int larch_insn_text_copy(void *dst, void *src, size_t len);
+
+ u32 larch_insn_gen_nop(void);
+ u32 larch_insn_gen_b(unsigned long pc, unsigned long dest);
+--- 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>
+@@ -229,6 +231,50 @@ int larch_insn_patch_text(void *addr, u3
+
+ 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)
+ {
+--- a/arch/loongarch/net/bpf_jit.c
++++ b/arch/loongarch/net/bpf_jit.c
+@@ -4,8 +4,12 @@
+ *
+ * Copyright (C) 2022 Loongson Technology Corporation Limited
+ */
++#include <linux/memory.h>
+ #include "bpf_jit.h"
+
++#define LOONGARCH_LONG_JUMP_NINSNS 5
++#define LOONGARCH_LONG_JUMP_NBYTES (LOONGARCH_LONG_JUMP_NINSNS * 4)
++
+ #define REG_TCC LOONGARCH_GPR_A6
+ #define TCC_SAVED LOONGARCH_GPR_S5
+
+@@ -88,7 +92,7 @@ static u8 tail_call_reg(struct jit_ctx *
+ */
+ static void build_prologue(struct jit_ctx *ctx)
+ {
+- int stack_adjust = 0, store_offset, bpf_stack_adjust;
++ int i, stack_adjust = 0, store_offset, bpf_stack_adjust;
+
+ bpf_stack_adjust = round_up(ctx->prog->aux->stack_depth, 16);
+
+@@ -98,6 +102,10 @@ static void build_prologue(struct jit_ct
+ stack_adjust = round_up(stack_adjust, 16);
+ stack_adjust += bpf_stack_adjust;
+
++ /* Reserve space for the move_imm + jirl instruction */
++ for (i = 0; i < LOONGARCH_LONG_JUMP_NINSNS; i++)
++ emit_insn(ctx, nop);
++
+ /*
+ * First instruction initializes the tail call count (TCC).
+ * On tail call we skip this instruction, and the TCC is
+@@ -1184,6 +1192,101 @@ static int validate_ctx(struct jit_ctx *
+ return 0;
+ }
+
++static int emit_jump_and_link(struct jit_ctx *ctx, u8 rd, u64 target)
++{
++ if (!target) {
++ pr_err("bpf_jit: jump target address is error\n");
++ return -EFAULT;
++ }
++
++ move_imm(ctx, LOONGARCH_GPR_T1, target, false);
++ emit_insn(ctx, jirl, rd, LOONGARCH_GPR_T1, 0);
++
++ return 0;
++}
++
++static int emit_jump_or_nops(void *target, void *ip, u32 *insns, bool is_call)
++{
++ int i;
++ struct jit_ctx ctx;
++
++ ctx.idx = 0;
++ ctx.image = (union loongarch_instruction *)insns;
++
++ if (!target) {
++ for (i = 0; i < LOONGARCH_LONG_JUMP_NINSNS; i++)
++ emit_insn((&ctx), nop);
++ return 0;
++ }
++
++ return emit_jump_and_link(&ctx, is_call ? LOONGARCH_GPR_T0 : LOONGARCH_GPR_ZERO, (u64)target);
++}
++
++void *bpf_arch_text_copy(void *dst, void *src, size_t len)
++{
++ int ret;
++
++ mutex_lock(&text_mutex);
++ ret = larch_insn_text_copy(dst, src, len);
++ mutex_unlock(&text_mutex);
++
++ return ret ? ERR_PTR(-EINVAL) : dst;
++}
++
++int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type poke_type,
++ void *old_addr, void *new_addr)
++{
++ int ret;
++ bool is_call = (poke_type == BPF_MOD_CALL);
++ u32 old_insns[LOONGARCH_LONG_JUMP_NINSNS] = {[0 ... 4] = INSN_NOP};
++ u32 new_insns[LOONGARCH_LONG_JUMP_NINSNS] = {[0 ... 4] = INSN_NOP};
++
++ if (!is_kernel_text((unsigned long)ip) &&
++ !is_bpf_text_address((unsigned long)ip))
++ return -ENOTSUPP;
++
++ ret = emit_jump_or_nops(old_addr, ip, old_insns, is_call);
++ if (ret)
++ return ret;
++
++ if (memcmp(ip, old_insns, LOONGARCH_LONG_JUMP_NBYTES))
++ return -EFAULT;
++
++ ret = emit_jump_or_nops(new_addr, ip, new_insns, is_call);
++ if (ret)
++ return ret;
++
++ mutex_lock(&text_mutex);
++ if (memcmp(ip, new_insns, LOONGARCH_LONG_JUMP_NBYTES))
++ ret = larch_insn_text_copy(ip, new_insns, LOONGARCH_LONG_JUMP_NBYTES);
++ mutex_unlock(&text_mutex);
++
++ return ret;
++}
++
++int bpf_arch_text_invalidate(void *dst, size_t len)
++{
++ int i;
++ int ret = 0;
++ u32 *inst;
++
++ inst = kvmalloc(len, GFP_KERNEL);
++ if (!inst)
++ return -ENOMEM;
++
++ for (i = 0; i < (len / sizeof(u32)); i++)
++ inst[i] = INSN_BREAK;
++
++ mutex_lock(&text_mutex);
++ if (larch_insn_text_copy(dst, inst, len))
++ ret = -EINVAL;
++ mutex_unlock(&text_mutex);
++
++ kvfree(inst);
++
++ return ret;
++}
++
+ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
+ {
+ bool tmp_blinded = false, extra_pass = false;
--- /dev/null
+From f9b6b41f0cf31791541cea9644ddbedb46465801 Mon Sep 17 00:00:00 2001
+Date: Tue, 5 Aug 2025 19:00:18 +0800
+Subject: [PATCH 04/12] LoongArch: BPF: Add basic bpf trampoline support
+
+BPF trampoline is the critical infrastructure of the BPF subsystem,
+acting as a mediator between kernel functions and BPF programs. Numerous
+important features, such as using BPF program for zero overhead kernel
+introspection, rely on this key component.
+
+The related tests have passed, including the following technical points:
+1. fentry
+2. fmod_ret
+3. fexit
+
+The following related testcases passed on LoongArch:
+sudo ./test_progs -a fentry_test/fentry
+sudo ./test_progs -a fexit_test/fexit
+sudo ./test_progs -a fentry_fexit
+sudo ./test_progs -a modify_return
+sudo ./test_progs -a fexit_sleep
+sudo ./test_progs -a test_overhead
+sudo ./test_progs -a trampoline_count
+
+This issue was first reported by Geliang Tang in June 2024 while
+debugging MPTCP BPF selftests on a LoongArch machine (see commit
+eef0532e900c "selftests/bpf: Null checks for links in bpf_tcp_ca").
+Geliang, Huacai, and Tiezhu then worked together to drive the
+implementation of this feature, encouraging broader collaboration among
+Chinese kernel engineers.
+
+---
+ arch/loongarch/net/bpf_jit.c | 377 +++++++++++++++++++++++++++++++++++
+ arch/loongarch/net/bpf_jit.h | 6 +
+ 2 files changed, 383 insertions(+)
+
+--- a/arch/loongarch/net/bpf_jit.c
++++ b/arch/loongarch/net/bpf_jit.c
+@@ -7,9 +7,15 @@
+ #include <linux/memory.h>
+ #include "bpf_jit.h"
+
++#define LOONGARCH_MAX_REG_ARGS 8
++
+ #define LOONGARCH_LONG_JUMP_NINSNS 5
+ #define LOONGARCH_LONG_JUMP_NBYTES (LOONGARCH_LONG_JUMP_NINSNS * 4)
+
++#define LOONGARCH_FENTRY_NINSNS 2
++#define LOONGARCH_FENTRY_NBYTES (LOONGARCH_FENTRY_NINSNS * 4)
++#define LOONGARCH_BPF_FENTRY_NBYTES (LOONGARCH_LONG_JUMP_NINSNS * 4)
++
+ #define REG_TCC LOONGARCH_GPR_A6
+ #define TCC_SAVED LOONGARCH_GPR_S5
+
+@@ -1222,6 +1228,11 @@ static int emit_jump_or_nops(void *targe
+ return emit_jump_and_link(&ctx, is_call ? LOONGARCH_GPR_T0 : LOONGARCH_GPR_ZERO, (u64)target);
+ }
+
++static int emit_call(struct jit_ctx *ctx, u64 addr)
++{
++ return emit_jump_and_link(ctx, LOONGARCH_GPR_RA, addr);
++}
++
+ void *bpf_arch_text_copy(void *dst, void *src, size_t len)
+ {
+ int ret;
+@@ -1287,6 +1298,372 @@ int bpf_arch_text_invalidate(void *dst,
+ return ret;
+ }
+
++static void store_args(struct jit_ctx *ctx, int nargs, int args_off)
++{
++ int i;
++
++ for (i = 0; i < nargs; i++) {
++ emit_insn(ctx, std, LOONGARCH_GPR_A0 + i, LOONGARCH_GPR_FP, -args_off);
++ args_off -= 8;
++ }
++}
++
++static void restore_args(struct jit_ctx *ctx, int nargs, int args_off)
++{
++ int i;
++
++ for (i = 0; i < nargs; i++) {
++ emit_insn(ctx, ldd, LOONGARCH_GPR_A0 + i, LOONGARCH_GPR_FP, -args_off);
++ args_off -= 8;
++ }
++}
++
++static int invoke_bpf_prog(struct jit_ctx *ctx, struct bpf_tramp_link *l,
++ int args_off, int retval_off, int run_ctx_off, bool save_ret)
++{
++ int ret;
++ u32 *branch;
++ struct bpf_prog *p = l->link.prog;
++ int cookie_off = offsetof(struct bpf_tramp_run_ctx, bpf_cookie);
++
++ if (l->cookie) {
++ move_imm(ctx, LOONGARCH_GPR_T1, l->cookie, false);
++ emit_insn(ctx, std, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -run_ctx_off + cookie_off);
++ } else {
++ emit_insn(ctx, std, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_FP, -run_ctx_off + cookie_off);
++ }
++
++ /* arg1: prog */
++ move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p, false);
++ /* arg2: &run_ctx */
++ emit_insn(ctx, addid, LOONGARCH_GPR_A1, LOONGARCH_GPR_FP, -run_ctx_off);
++ ret = emit_call(ctx, (const u64)bpf_trampoline_enter(p));
++ if (ret)
++ return ret;
++
++ /* store prog start time */
++ move_reg(ctx, LOONGARCH_GPR_S1, LOONGARCH_GPR_A0);
++
++ /*
++ * if (__bpf_prog_enter(prog) == 0)
++ * goto skip_exec_of_prog;
++ */
++ branch = (u32 *)ctx->image + ctx->idx;
++ /* nop reserved for conditional jump */
++ emit_insn(ctx, nop);
++
++ /* arg1: &args_off */
++ emit_insn(ctx, addid, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -args_off);
++ if (!p->jited)
++ move_imm(ctx, LOONGARCH_GPR_A1, (const s64)p->insnsi, false);
++ ret = emit_call(ctx, (const u64)p->bpf_func);
++ if (ret)
++ return ret;
++
++ if (save_ret) {
++ emit_insn(ctx, std, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -retval_off);
++ emit_insn(ctx, std, regmap[BPF_REG_0], LOONGARCH_GPR_FP, -(retval_off - 8));
++ }
++
++ /* update branch with beqz */
++ if (ctx->image) {
++ int offset = (void *)(&ctx->image[ctx->idx]) - (void *)branch;
++ *branch = larch_insn_gen_beq(LOONGARCH_GPR_A0, LOONGARCH_GPR_ZERO, offset);
++ }
++
++ /* arg1: prog */
++ move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p, false);
++ /* arg2: prog start time */
++ move_reg(ctx, LOONGARCH_GPR_A1, LOONGARCH_GPR_S1);
++ /* arg3: &run_ctx */
++ emit_insn(ctx, addid, LOONGARCH_GPR_A2, LOONGARCH_GPR_FP, -run_ctx_off);
++ ret = emit_call(ctx, (const u64)bpf_trampoline_exit(p));
++
++ return ret;
++}
++
++static void invoke_bpf_mod_ret(struct jit_ctx *ctx, struct bpf_tramp_links *tl,
++ int args_off, int retval_off, int run_ctx_off, u32 **branches)
++{
++ int i;
++
++ emit_insn(ctx, std, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_FP, -retval_off);
++ for (i = 0; i < tl->nr_links; i++) {
++ invoke_bpf_prog(ctx, tl->links[i], args_off, retval_off, run_ctx_off, true);
++ emit_insn(ctx, ldd, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -retval_off);
++ branches[i] = (u32 *)ctx->image + ctx->idx;
++ emit_insn(ctx, nop);
++ }
++}
++
++void *arch_alloc_bpf_trampoline(unsigned int size)
++{
++ return bpf_prog_pack_alloc(size, jit_fill_hole);
++}
++
++void arch_free_bpf_trampoline(void *image, unsigned int size)
++{
++ bpf_prog_pack_free(image, size);
++}
++
++static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_image *im,
++ const struct btf_func_model *m, struct bpf_tramp_links *tlinks,
++ void *func_addr, u32 flags)
++{
++ int i, ret, save_ret;
++ int stack_size = 0, nargs = 0;
++ int retval_off, args_off, nargs_off, ip_off, run_ctx_off, sreg_off;
++ void *orig_call = func_addr;
++ struct bpf_tramp_links *fentry = &tlinks[BPF_TRAMP_FENTRY];
++ struct bpf_tramp_links *fexit = &tlinks[BPF_TRAMP_FEXIT];
++ struct bpf_tramp_links *fmod_ret = &tlinks[BPF_TRAMP_MODIFY_RETURN];
++ u32 **branches = NULL;
++
++ if (flags & (BPF_TRAMP_F_ORIG_STACK | BPF_TRAMP_F_SHARE_IPMODIFY))
++ return -ENOTSUPP;
++
++ /*
++ * FP + 8 [ RA to parent func ] return address to parent
++ * function
++ * FP + 0 [ FP of parent func ] frame pointer of parent
++ * function
++ * FP - 8 [ T0 to traced func ] return address of traced
++ * function
++ * FP - 16 [ FP of traced func ] frame pointer of traced
++ * function
++ *
++ * FP - retval_off [ return value ] BPF_TRAMP_F_CALL_ORIG or
++ * BPF_TRAMP_F_RET_FENTRY_RET
++ * [ argN ]
++ * [ ... ]
++ * FP - args_off [ arg1 ]
++ *
++ * FP - nargs_off [ regs count ]
++ *
++ * FP - ip_off [ traced func ] BPF_TRAMP_F_IP_ARG
++ *
++ * FP - run_ctx_off [ bpf_tramp_run_ctx ]
++ *
++ * FP - sreg_off [ callee saved reg ]
++ *
++ */
++
++ if (m->nr_args > LOONGARCH_MAX_REG_ARGS)
++ return -ENOTSUPP;
++
++ if (flags & (BPF_TRAMP_F_ORIG_STACK | BPF_TRAMP_F_SHARE_IPMODIFY))
++ return -ENOTSUPP;
++
++ stack_size = 0;
++
++ /* Room of trampoline frame to store return address and frame pointer */
++ stack_size += 16;
++
++ save_ret = flags & (BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_RET_FENTRY_RET);
++ if (save_ret) {
++ /* Save BPF R0 and A0 */
++ stack_size += 16;
++ retval_off = stack_size;
++ }
++
++ /* Room of trampoline frame to store args */
++ nargs = m->nr_args;
++ stack_size += nargs * 8;
++ args_off = stack_size;
++
++ /* Room of trampoline frame to store args number */
++ stack_size += 8;
++ nargs_off = stack_size;
++
++ /* Room of trampoline frame to store ip address */
++ if (flags & BPF_TRAMP_F_IP_ARG) {
++ stack_size += 8;
++ ip_off = stack_size;
++ }
++
++ /* Room of trampoline frame to store struct bpf_tramp_run_ctx */
++ stack_size += round_up(sizeof(struct bpf_tramp_run_ctx), 8);
++ run_ctx_off = stack_size;
++
++ stack_size += 8;
++ sreg_off = stack_size;
++
++ stack_size = round_up(stack_size, 16);
++
++ /* For the trampoline called from function entry */
++ /* RA and FP for parent function */
++ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, -16);
++ emit_insn(ctx, std, LOONGARCH_GPR_RA, LOONGARCH_GPR_SP, 8);
++ emit_insn(ctx, std, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, 0);
++ emit_insn(ctx, addid, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, 16);
++
++ /* RA and FP for traced function */
++ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, -stack_size);
++ emit_insn(ctx, std, LOONGARCH_GPR_T0, LOONGARCH_GPR_SP, stack_size - 8);
++ emit_insn(ctx, std, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size - 16);
++ emit_insn(ctx, addid, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size);
++
++ /* callee saved register S1 to pass start time */
++ emit_insn(ctx, std, LOONGARCH_GPR_S1, LOONGARCH_GPR_FP, -sreg_off);
++
++ /* store ip address of the traced function */
++ if (flags & BPF_TRAMP_F_IP_ARG) {
++ move_imm(ctx, LOONGARCH_GPR_T1, (const s64)func_addr, false);
++ emit_insn(ctx, std, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -ip_off);
++ }
++
++ /* store nargs number */
++ move_imm(ctx, LOONGARCH_GPR_T1, nargs, false);
++ emit_insn(ctx, std, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -nargs_off);
++
++ store_args(ctx, nargs, args_off);
++
++ /* To traced function */
++ /* Ftrace jump skips 2 NOP instructions */
++ if (is_kernel_text((unsigned long)orig_call))
++ orig_call += LOONGARCH_FENTRY_NBYTES;
++ /* Direct jump skips 5 NOP instructions */
++ else if (is_bpf_text_address((unsigned long)orig_call))
++ orig_call += LOONGARCH_BPF_FENTRY_NBYTES;
++
++ if (flags & BPF_TRAMP_F_CALL_ORIG) {
++ move_imm(ctx, LOONGARCH_GPR_A0, (const s64)im, false);
++ ret = emit_call(ctx, (const u64)__bpf_tramp_enter);
++ if (ret)
++ return ret;
++ }
++
++ for (i = 0; i < fentry->nr_links; i++) {
++ ret = invoke_bpf_prog(ctx, fentry->links[i], args_off, retval_off,
++ run_ctx_off, flags & BPF_TRAMP_F_RET_FENTRY_RET);
++ if (ret)
++ return ret;
++ }
++ if (fmod_ret->nr_links) {
++ branches = kcalloc(fmod_ret->nr_links, sizeof(u32 *), GFP_KERNEL);
++ if (!branches)
++ return -ENOMEM;
++
++ invoke_bpf_mod_ret(ctx, fmod_ret, args_off, retval_off, run_ctx_off, branches);
++ }
++
++ if (flags & BPF_TRAMP_F_CALL_ORIG) {
++ restore_args(ctx, m->nr_args, args_off);
++ ret = emit_call(ctx, (const u64)orig_call);
++ if (ret)
++ goto out;
++ emit_insn(ctx, std, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -retval_off);
++ emit_insn(ctx, std, regmap[BPF_REG_0], LOONGARCH_GPR_FP, -(retval_off - 8));
++ im->ip_after_call = ctx->ro_image + ctx->idx;
++ /* Reserve space for the move_imm + jirl instruction */
++ for (i = 0; i < LOONGARCH_LONG_JUMP_NINSNS; i++)
++ emit_insn(ctx, nop);
++ }
++
++ for (i = 0; ctx->image && i < fmod_ret->nr_links; i++) {
++ int offset = (void *)(&ctx->image[ctx->idx]) - (void *)branches[i];
++ *branches[i] = larch_insn_gen_bne(LOONGARCH_GPR_T1, LOONGARCH_GPR_ZERO, offset);
++ }
++
++ for (i = 0; i < fexit->nr_links; i++) {
++ ret = invoke_bpf_prog(ctx, fexit->links[i], args_off, retval_off, run_ctx_off, false);
++ if (ret)
++ goto out;
++ }
++
++ if (flags & BPF_TRAMP_F_CALL_ORIG) {
++ im->ip_epilogue = ctx->ro_image + ctx->idx;
++ move_imm(ctx, LOONGARCH_GPR_A0, (const s64)im, false);
++ ret = emit_call(ctx, (const u64)__bpf_tramp_exit);
++ if (ret)
++ goto out;
++ }
++
++ if (flags & BPF_TRAMP_F_RESTORE_REGS)
++ restore_args(ctx, m->nr_args, args_off);
++
++ if (save_ret) {
++ emit_insn(ctx, ldd, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -retval_off);
++ emit_insn(ctx, ldd, regmap[BPF_REG_0], LOONGARCH_GPR_FP, -(retval_off - 8));
++ }
++
++ emit_insn(ctx, ldd, LOONGARCH_GPR_S1, LOONGARCH_GPR_FP, -sreg_off);
++
++ /* trampoline called from function entry */
++ emit_insn(ctx, ldd, LOONGARCH_GPR_T0, LOONGARCH_GPR_SP, stack_size - 8);
++ emit_insn(ctx, ldd, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size - 16);
++ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, stack_size);
++
++ emit_insn(ctx, ldd, LOONGARCH_GPR_RA, LOONGARCH_GPR_SP, 8);
++ emit_insn(ctx, ldd, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, 0);
++ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, 16);
++
++ if (flags & BPF_TRAMP_F_SKIP_FRAME)
++ /* return to parent function */
++ emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_RA, 0);
++ else
++ /* return to traced function */
++ emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T0, 0);
++
++ ret = ctx->idx;
++out:
++ kfree(branches);
++
++ return ret;
++}
++
++int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *ro_image,
++ void *ro_image_end, const struct btf_func_model *m,
++ u32 flags, struct bpf_tramp_links *tlinks, void *func_addr)
++{
++ int ret, size;
++ void *image, *tmp;
++ struct jit_ctx ctx;
++
++ size = ro_image_end - ro_image;
++ image = kvmalloc(size, GFP_KERNEL);
++ if (!image)
++ return -ENOMEM;
++
++ ctx.image = (union loongarch_instruction *)image;
++ ctx.ro_image = (union loongarch_instruction *)ro_image;
++ ctx.idx = 0;
++
++ jit_fill_hole(image, (unsigned int)(ro_image_end - ro_image));
++ ret = __arch_prepare_bpf_trampoline(&ctx, im, m, tlinks, func_addr, flags);
++ if (ret > 0 && validate_code(&ctx) < 0) {
++ ret = -EINVAL;
++ goto out;
++ }
++
++ tmp = bpf_arch_text_copy(ro_image, image, size);
++ if (IS_ERR(tmp)) {
++ ret = PTR_ERR(tmp);
++ goto out;
++ }
++
++ bpf_flush_icache(ro_image, ro_image_end);
++out:
++ kvfree(image);
++ return ret < 0 ? ret : size;
++}
++
++int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
++ struct bpf_tramp_links *tlinks, void *func_addr)
++{
++ int ret;
++ struct jit_ctx ctx;
++ struct bpf_tramp_image im;
++
++ ctx.image = NULL;
++ ctx.idx = 0;
++
++ ret = __arch_prepare_bpf_trampoline(&ctx, &im, m, tlinks, func_addr, flags);
++
++ /* Page align */
++ return ret < 0 ? ret : round_up(ret * LOONGARCH_INSN_SIZE, PAGE_SIZE);
++}
++
+ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
+ {
+ bool tmp_blinded = false, extra_pass = false;
+--- a/arch/loongarch/net/bpf_jit.h
++++ b/arch/loongarch/net/bpf_jit.h
+@@ -18,6 +18,7 @@ struct jit_ctx {
+ u32 *offset;
+ int num_exentries;
+ union loongarch_instruction *image;
++ union loongarch_instruction *ro_image;
+ u32 stack_size;
+ };
+
+@@ -308,3 +309,8 @@ static inline int emit_tailcall_jmp(stru
+
+ return -EINVAL;
+ }
++
++static inline void bpf_flush_icache(void *start, void *end)
++{
++ flush_icache_range((unsigned long)start, (unsigned long)end);
++}
projects / openwrt / openwrt.git / commitdiff