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-rw-r--r--sim/bpf/bpf.c329
1 files changed, 0 insertions, 329 deletions
diff --git a/sim/bpf/bpf.c b/sim/bpf/bpf.c
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--- a/sim/bpf/bpf.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/* eBPF simulator support code
- Copyright (C) 2020-2023 Free Software Foundation, Inc.
-
- This file is part of GDB, the GNU debugger.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-/* This must come before any other includes. */
-#include "defs.h"
-
-#define WANT_CPU_BPFBF
-#define WANT_CPU bpfbf
-
-#include "sim-main.h"
-#include "sim-fpu.h"
-#include "sim-signal.h"
-#include "cgen-mem.h"
-#include "cgen-ops.h"
-#include "cpuall.h"
-#include "decode.h"
-
-#include "decode-be.h"
-#include "decode-le.h"
-
-#include "defs-le.h" /* For SCACHE */
-#include "bpf-helpers.h"
-
-uint64_t skb_data_offset;
-
-IDESC *bpf_idesc_le;
-IDESC *bpf_idesc_be;
-
-
-int
-bpfbf_fetch_register (SIM_CPU *current_cpu,
- int rn,
- void *buf,
- int len)
-{
- if (rn == 11)
- SETTDI (buf, CPU_PC_GET (current_cpu));
- else if (0 <= rn && rn < 10)
- SETTDI (buf, GET_H_GPR (rn));
- else
- return 0;
-
- return len;
-}
-
-int
-bpfbf_store_register (SIM_CPU *current_cpu,
- int rn,
- const void *buf,
- int len)
-{
- if (rn == 11)
- CPU_PC_SET (current_cpu, GETTDI (buf));
- else if (0 <= rn && rn < 10)
- SET_H_GPR (rn, GETTDI (buf));
- else
- return 0;
-
- return len;
-}
-
-void
-bpfbf_model_insn_before (SIM_CPU *current_cpu, int first_p)
-{
- /* XXX */
-}
-
-void
-bpfbf_model_insn_after (SIM_CPU *current_cpu, int first_p, int cycles)
-{
- /* XXX */
-}
-
-
-/***** Instruction helpers. *****/
-
-/* The semantic routines for most instructions are expressed in RTL in
- the cpu/bpf.cpu file, and automatically translated to C in the
- sem-*.c files in this directory.
-
- However, some of the semantic routines make use of helper C
- functions. This happens when the semantics of the instructions
- can't be expressed in RTL alone in a satisfactory way, or not at
- all.
-
- The following functions implement these C helpers. */
-
-DI
-bpfbf_endle (SIM_CPU *current_cpu, DI value, UINT bitsize)
-{
- switch (bitsize)
- {
- case 16: return endian_h2le_2(endian_t2h_2(value));
- case 32: return endian_h2le_4(endian_t2h_4(value));
- case 64: return endian_h2le_8(endian_t2h_8(value));
- default: assert(0);
- }
- return value;
-}
-
-DI
-bpfbf_endbe (SIM_CPU *current_cpu, DI value, UINT bitsize)
-{
- switch (bitsize)
- {
- case 16: return endian_h2be_2(endian_t2h_2(value));
- case 32: return endian_h2be_4(endian_t2h_4(value));
- case 64: return endian_h2be_8(endian_t2h_8(value));
- default: assert(0);
- }
- return value;
-}
-
-DI
-bpfbf_skb_data_offset (SIM_CPU *current_cpu)
-{
- /* Simply return the user-configured value.
- This will be 0 if it has not been set. */
- return skb_data_offset;
-}
-
-
-VOID
-bpfbf_call (SIM_CPU *current_cpu, INT disp32, UINT src)
-{
- /* eBPF supports two kind of CALL instructions: the so called pseudo
- calls ("bpf to bpf") and external calls ("bpf to helper").
-
- Both kind of calls use the same instruction (CALL). However,
- external calls are constructed by passing a constant argument to
- the instruction, that identifies the helper, whereas pseudo calls
- result from expressions involving symbols.
-
- We distinguish calls from pseudo-calls with the later having a 1
- stored in the SRC field of the instruction. */
-
- if (src == 1)
- {
- /* This is a pseudo-call. */
-
- /* XXX allocate a new stack frame and transfer control. For
- that we need to analyze the target function, like the kernel
- verifier does. We better populate a cache
- (function_start_address -> frame_size) so we avoid
- calculating this more than once. */
- /* XXX note that disp32 is PC-relative in number of 64-bit
- words, _minus one_. */
- }
- else
- {
- /* This is a call to a helper.
-
- DISP32 contains the helper number. Dispatch to the
- corresponding helper emulator in bpf-helpers.c. */
-
- switch (disp32) {
- /* case TRACE_PRINTK: */
- case 7:
- bpf_trace_printk (current_cpu);
- break;
- default:;
- }
- }
-}
-
-VOID
-bpfbf_exit (SIM_CPU *current_cpu)
-{
- SIM_DESC sd = CPU_STATE (current_cpu);
-
- /* r0 holds "return code" */
- DI r0 = GET_H_GPR (0);
-
- printf ("exit %" PRId64 " (0x%" PRIx64 ")\n", r0, r0);
-
- sim_engine_halt (sd, current_cpu, NULL, CPU_PC_GET (current_cpu),
- sim_exited, 0 /* sigrc */);
-}
-
-VOID
-bpfbf_breakpoint (SIM_CPU *current_cpu)
-{
- SIM_DESC sd = CPU_STATE (current_cpu);
-
- sim_engine_halt (sd, current_cpu, NULL, CPU_PC_GET (current_cpu),
- sim_stopped, SIM_SIGTRAP);
-}
-
-/* We use the definitions below instead of the cgen-generated model.c,
- because the later is not really able to work with cpus featuring
- several ISAs. This should be fixed in CGEN. */
-
-static void
-bpf_def_model_init (SIM_CPU *cpu)
-{
- /* Do nothing. */
-}
-
-static void
-bpfbf_prepare_run (SIM_CPU *cpu)
-{
- /* Nothing. */
-}
-
-static void
-bpf_engine_run_full (SIM_CPU *cpu)
-{
- if (CURRENT_TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE)
- {
- if (!bpf_idesc_le)
- {
- bpfbf_ebpfle_init_idesc_table (cpu);
- bpf_idesc_le = CPU_IDESC (cpu);
- }
- else
- CPU_IDESC (cpu) = bpf_idesc_le;
-
- bpfbf_ebpfle_engine_run_full (cpu);
- }
- else
- {
- if (!bpf_idesc_be)
- {
- bpfbf_ebpfbe_init_idesc_table (cpu);
- bpf_idesc_be = CPU_IDESC (cpu);
- }
- else
- CPU_IDESC (cpu) = bpf_idesc_be;
-
- bpfbf_ebpfbe_engine_run_full (cpu);
- }
-}
-
-#if WITH_FAST
-
-void
-bpf_engine_run_fast (SIM_CPU *cpu)
-{
- if (CURRENT_TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE)
- {
- if (!bpf_idesc_le)
- {
- bpfbf_ebpfle_init_idesc_table (cpu);
- bpf_idesc_le = CPU_IDESC (cpu);
- }
- else
- CPU_IDESC (cpu) = bpf_idesc_le;
-
- bpfbf_ebpfle_engine_run_fast (cpu);
- }
- else
- {
- if (!bpf_idesc_be)
- {
- bpfbf_ebpfbe_init_idesc_table (cpu);
- bpf_idesc_be = CPU_IDESC (cpu);
- }
- else
- CPU_IDESC (cpu) = bpf_idesc_be;
-
- bpfbf_ebpfbe_engine_run_fast (cpu);
- }
-}
-
-#endif /* WITH_FAST */
-
-static const CGEN_INSN *
-bpfbf_get_idata (SIM_CPU *cpu, int inum)
-{
- return CPU_IDESC (cpu) [inum].idata;
-}
-
-static void
-bpf_init_cpu (SIM_CPU *cpu)
-{
- CPU_REG_FETCH (cpu) = bpfbf_fetch_register;
- CPU_REG_STORE (cpu) = bpfbf_store_register;
- CPU_PC_FETCH (cpu) = bpfbf_h_pc_get;
- CPU_PC_STORE (cpu) = bpfbf_h_pc_set;
- CPU_GET_IDATA (cpu) = bpfbf_get_idata;
- /* Only used by profiling. 0 disables it. */
- CPU_MAX_INSNS (cpu) = 0;
- CPU_INSN_NAME (cpu) = cgen_insn_name;
- CPU_FULL_ENGINE_FN (cpu) = bpf_engine_run_full;
-#if WITH_FAST
- CPU_FAST_ENGINE_FN (cpu) = bpf_engine_run_fast;
-#else
- CPU_FAST_ENGINE_FN (cpu) = bpf_engine_run_full;
-#endif
-}
-
-static const SIM_MODEL bpf_models[] =
-{
- { "bpf-def", & bpf_mach, MODEL_BPF_DEF, NULL, bpf_def_model_init },
- { 0 }
-};
-
-static const SIM_MACH_IMP_PROPERTIES bpfbf_imp_properties =
-{
- sizeof (SIM_CPU),
-#if WITH_SCACHE
- sizeof (SCACHE)
-#else
- 0
-#endif
-};
-
-const SIM_MACH bpf_mach =
-{
- "bpf", "bpf", MACH_BPF,
- 32, 32, & bpf_models[0], & bpfbf_imp_properties,
- bpf_init_cpu,
- bpfbf_prepare_run
-};
generated by cgit v1.1 at 2024-07-31 16:06:28 +0000