mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-27 04:52:05 +08:00
76f11310df
Various files were not including the relevant headers, or some funcs were missing prototypes entirely, leading to mismatch between the actual definition of the functions. Add includes to a few places and fix the broken functions that are uncovered as a result. Fixing some compile warnings (e.g. missing prototypes) often find real bugs.
182 lines
5.8 KiB
C
182 lines
5.8 KiB
C
/* Emulation of eBPF helpers.
|
|
Copyright (C) 2020-2021 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;
|
|
}
|