printgarbage.c

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/kprintf.h"
#include "libc/log/log.h"
#include "libc/nexgen32e/gc.internal.h"
#include "libc/stdio/stdio.h"
#include "libc/thread/tls.h"
// clang-format off

/**
 * Prints list of deferred operations on shadow stack.
 */
void PrintGarbage(void) {
  size_t i;
  char name[19];
  const char *symbol;
  struct Garbages *g;
  kprintf("\n");
  kprintf("                    SHADOW STACK %P @ %p\n", __builtin_frame_address(0));
  kprintf("garbage ent. parent frame     original ret        callback              arg        \n");
  kprintf("------------ ------------ ------------------ ------------------ ------------------\n");
  if ((g = __tls_enabled ? __get_tls()->tib_garbages:0) && g->i) {
    for (i = g->n; i--;) {
      symbol = GetSymbolByAddr(g->p[i].ret);
      if (symbol) {
        ksnprintf(name, sizeof(name), "%s", symbol);
      } else {
        ksnprintf(name, sizeof(name), "%#014lx", g->p[i].ret);
      }
      kprintf("%12lx %12lx %18s %18s %#18lx\n",
              g->p + i,
              g->p[i].frame,
              name,
              GetSymbolByAddr(g->p[i].fn),
              g->p[i].arg);
    }
  } else {
    kprintf("%12s %12s %18s %18s %18s\n","empty","-","-","-","-");
  }
  kprintf("\n");
}