riscv, bpf: Add 12-argument support for RV64 bpf trampoline

This patch adds 12 function arguments support for riscv64 bpf trampoline.
The current bpf trampoline supports <= sizeof(u64) bytes scalar arguments [0]
and <= 16 bytes struct arguments [1]. Therefore, we focus on the situation
where scalars are at most XLEN bits and aggregates whose total size does not
exceed 2×XLEN bits in the riscv calling convention [2].
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Acked-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://elixir.bootlin.com/linux/v6.8/source/kernel/bpf/btf.c#L6184 [0]
Link: https://elixir.bootlin.com/linux/v6.8/source/kernel/bpf/btf.c#L6769 [1]
Link: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases/download/draft-20230929-e5c800e661a53efe3c2678d71a306323b60eb13b/riscv-abi.pdf [2]
Link: https://lore.kernel.org/bpf/20240702121944.1091530-2-pulehui@huaweicloud.com

arch/riscv/net/bpf_jit_comp64.c

@@ -15,6 +15,7 @@
 #include <asm/percpu.h>
 #include "bpf_jit.h"
 
+#define RV_MAX_REG_ARGS 8
 #define RV_FENTRY_NINSNS 2
 /* imm that allows emit_imm to emit max count insns */
 #define RV_MAX_COUNT_IMM 0x7FFF7FF7FF7FF7FF
@@ -692,26 +693,45 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type poke_type,
 	return ret;
 }
 
-static void store_args(int nregs, int args_off, struct rv_jit_context *ctx)
+static void store_args(int nr_arg_slots, int args_off, struct rv_jit_context *ctx)
 {
 	int i;
 
-	for (i = 0; i < nregs; i++) {
+	for (i = 0; i < nr_arg_slots; i++) {
+		if (i < RV_MAX_REG_ARGS) {
 			emit_sd(RV_REG_FP, -args_off, RV_REG_A0 + i, ctx);
+		} else {
+			/* skip slots for T0 and FP of traced function */
+			emit_ld(RV_REG_T1, 16 + (i - RV_MAX_REG_ARGS) * 8, RV_REG_FP, ctx);
+			emit_sd(RV_REG_FP, -args_off, RV_REG_T1, ctx);
+		}
 		args_off -= 8;
 	}
 }
 
-static void restore_args(int nregs, int args_off, struct rv_jit_context *ctx)
+static void restore_args(int nr_reg_args, int args_off, struct rv_jit_context *ctx)
 {
 	int i;
 
-	for (i = 0; i < nregs; i++) {
+	for (i = 0; i < nr_reg_args; i++) {
 		emit_ld(RV_REG_A0 + i, -args_off, RV_REG_FP, ctx);
 		args_off -= 8;
 	}
 }
 
+static void restore_stack_args(int nr_stack_args, int args_off, int stk_arg_off,
+			       struct rv_jit_context *ctx)
+{
+	int i;
+
+	for (i = 0; i < nr_stack_args; i++) {
+		emit_ld(RV_REG_T1, -(args_off - RV_MAX_REG_ARGS * 8), RV_REG_FP, ctx);
+		emit_sd(RV_REG_FP, -stk_arg_off, RV_REG_T1, ctx);
+		args_off -= 8;
+		stk_arg_off -= 8;
+	}
+}
+
 static int invoke_bpf_prog(struct bpf_tramp_link *l, int args_off, int retval_off,
 			   int run_ctx_off, bool save_ret, struct rv_jit_context *ctx)
 {
@@ -784,8 +804,8 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 {
 	int i, ret, offset;
 	int *branches_off = NULL;
-	int stack_size = 0, nregs = m->nr_args;
-	int retval_off, args_off, nregs_off, ip_off, run_ctx_off, sreg_off;
+	int stack_size = 0, nr_arg_slots = 0;
+	int retval_off, args_off, nregs_off, ip_off, run_ctx_off, sreg_off, stk_arg_off;
 	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];
@@ -831,20 +851,21 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	 * FP - sreg_off    [ callee saved reg	]
 	 *
 	 *		    [ pads              ] pads for 16 bytes alignment
+	 *
+	 *		    [ stack_argN        ]
+	 *		    [ ...               ]
+	 * FP - stk_arg_off [ stack_arg1        ] BPF_TRAMP_F_CALL_ORIG
 	 */
 
 	if (flags & (BPF_TRAMP_F_ORIG_STACK | BPF_TRAMP_F_SHARE_IPMODIFY))
 		return -ENOTSUPP;
 
-	/* extra regiters for struct arguments */
-	for (i = 0; i < m->nr_args; i++)
-		if (m->arg_flags[i] & BTF_FMODEL_STRUCT_ARG)
-			nregs += round_up(m->arg_size[i], 8) / 8 - 1;
-
-	/* 8 arguments passed by registers */
-	if (nregs > 8)
+	if (m->nr_args > MAX_BPF_FUNC_ARGS)
 		return -ENOTSUPP;
 
+	for (i = 0; i < m->nr_args; i++)
+		nr_arg_slots += round_up(m->arg_size[i], 8) / 8;
+
 	/* room of trampoline frame to store return address and frame pointer */
 	stack_size += 16;
 
@@ -854,7 +875,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 		retval_off = stack_size;
 	}
 
-	stack_size += nregs * 8;
+	stack_size += nr_arg_slots * 8;
 	args_off = stack_size;
 
 	stack_size += 8;
@@ -871,8 +892,14 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	stack_size += 8;
 	sreg_off = stack_size;
 
+	if (nr_arg_slots - RV_MAX_REG_ARGS > 0)
+		stack_size += (nr_arg_slots - RV_MAX_REG_ARGS) * 8;
+
 	stack_size = round_up(stack_size, STACK_ALIGN);
 
+	/* room for args on stack must be at the top of stack */
+	stk_arg_off = stack_size;
+
 	if (!is_struct_ops) {
 		/* For the trampoline called from function entry,
 		 * the frame of traced function and the frame of
@@ -908,10 +935,10 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 		emit_sd(RV_REG_FP, -ip_off, RV_REG_T1, ctx);
 	}
 
-	emit_li(RV_REG_T1, nregs, ctx);
+	emit_li(RV_REG_T1, nr_arg_slots, ctx);
 	emit_sd(RV_REG_FP, -nregs_off, RV_REG_T1, ctx);
 
-	store_args(nregs, args_off, ctx);
+	store_args(nr_arg_slots, args_off, ctx);
 
 	/* skip to actual body of traced function */
 	if (flags & BPF_TRAMP_F_SKIP_FRAME)
@@ -951,7 +978,8 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	}
 
 	if (flags & BPF_TRAMP_F_CALL_ORIG) {
-		restore_args(nregs, args_off, ctx);
+		restore_args(min_t(int, nr_arg_slots, RV_MAX_REG_ARGS), args_off, ctx);
+		restore_stack_args(nr_arg_slots - RV_MAX_REG_ARGS, args_off, stk_arg_off, ctx);
 		ret = emit_call((const u64)orig_call, true, ctx);
 		if (ret)
 			goto out;
@@ -986,7 +1014,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	}
 
 	if (flags & BPF_TRAMP_F_RESTORE_REGS)
-		restore_args(nregs, args_off, ctx);
+		restore_args(min_t(int, nr_arg_slots, RV_MAX_REG_ARGS), args_off, ctx);
 
 	if (save_ret) {
 		emit_ld(RV_REG_A0, -retval_off, RV_REG_FP, ctx);