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Diffstat (limited to 'sim/bpf/bpf-helpers.c')
| -rw-r--r-- | sim/bpf/bpf-helpers.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/sim/bpf/bpf-helpers.c b/sim/bpf/bpf-helpers.c deleted file mode 100644 index 4dc7eca..0000000 --- a/sim/bpf/bpf-helpers.c +++ /dev/null @@ -1,181 +0,0 @@ -/* Emulation of eBPF helpers. - 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/>. */ - -/* BPF programs rely on the existence of several helper functions, - which are provided by the kernel. This simulator provides an - implementation of the helpers, which can be customized by the - user. */ - -/* This must come before any other includes. */ -#include "defs.h" - -#define WANT_CPU_BPFBF -#define WANT_CPU bpfbf - -#include "sim-main.h" -#include "cgen-mem.h" -#include "cgen-ops.h" -#include "cpu.h" - -#include "bpf-helpers.h" - -/* bpf_trace_printk is a printk-like facility for debugging. - - In the kernel, it appends a line to the Linux's tracing debugging - interface. - - In this simulator, it uses the simulator's tracing interface - instead. - - The format tags recognized by this helper are: - %d, %i, %u, %x, %ld, %li, %lu, %lx, %lld, %lli, %llu, %llx, - %p, %s - - A maximum of three tags are supported. - - This helper returns the number of bytes written, or a negative - value in case of failure. */ - -int -bpf_trace_printk (SIM_CPU *current_cpu) -{ - va_list ap; - SIM_DESC sd = CPU_STATE (current_cpu); - - DI fmt_address; - uint32_t size, tags_processed; - size_t i, bytes_written = 0; - - /* The first argument is the format string, which is passed as a - pointer in %r1. */ - fmt_address = GET_H_GPR (1); - - /* The second argument is the length of the format string, as an - unsigned 32-bit number in %r2. */ - size = GET_H_GPR (2); - - /* Read the format string from the memory pointed by %r2, printing - out the stuff as we go. There is a maximum of three format tags - supported, which are read from %r3, %r4 and %r5 respectively. */ - for (i = 0, tags_processed = 0; i < size;) - { - UDI value; - QI c = GETMEMUQI (current_cpu, CPU_PC_GET (current_cpu), - fmt_address + i); - - switch (c) - { - case '%': - /* Check we are not exceeding the limit of three format - tags. */ - if (tags_processed > 2) - return -1; /* XXX look for kernel error code. */ - - /* Depending on the kind of tag, extract the value from the - proper argument. */ - if (i++ >= size) - return -1; /* XXX look for kernel error code. */ - - value = GET_H_GPR (3 + tags_processed); - - switch ((GETMEMUQI (current_cpu, CPU_PC_GET (current_cpu), - fmt_address + i))) - { - case 'd': - trace_printf (sd, current_cpu, "%d", (int) value); - break; - case 'i': - trace_printf (sd, current_cpu, "%i", (int) value); - break; - case 'u': - trace_printf (sd, current_cpu, "%u", (unsigned int) value); - break; - case 'x': - trace_printf (sd, current_cpu, "%x", (unsigned int) value); - break; - case 'l': - { - if (i++ >= size) - return -1; - switch (GETMEMUQI (current_cpu, CPU_PC_GET (current_cpu), - fmt_address + i)) - { - case 'd': - trace_printf (sd, current_cpu, "%ld", (long) value); - break; - case 'i': - trace_printf (sd, current_cpu, "%li", (long) value); - break; - case 'u': - trace_printf (sd, current_cpu, "%lu", (unsigned long) value); - break; - case 'x': - trace_printf (sd, current_cpu, "%lx", (unsigned long) value); - break; - case 'l': - { - if (i++ >= size) - return -1; - switch (GETMEMUQI (current_cpu, CPU_PC_GET (current_cpu), - fmt_address + i)) { - case 'd': - trace_printf (sd, current_cpu, "%lld", (long long) value); - break; - case 'i': - trace_printf (sd, current_cpu, "%lli", (long long) value); - break; - case 'u': - trace_printf (sd, current_cpu, "%llu", (unsigned long long) value); - break; - case 'x': - trace_printf (sd, current_cpu, "%llx", (unsigned long long) value); - break; - default: - assert (0); - break; - } - break; - } - default: - assert (0); - break; - } - break; - } - default: - /* XXX completeme */ - assert (0); - break; - } - - tags_processed++; - i++; - break; - case '\0': - i = size; - break; - default: - trace_printf (sd, current_cpu, "%c", c); - bytes_written++; - i++; - break; - } - } - - return bytes_written; -} |