/* sframe-dump.c - Textual dump of .sframe.

   Copyright (C) 2022-2023 Free Software Foundation, Inc.

   This file is part of libsframe.

   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/>.  */

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include <inttypes.h>

#include "sframe-impl.h"

#define SFRAME_HEADER_FLAGS_STR_MAX_LEN 50

/* Return TRUE if the SFrame section is associated with the aarch64 ABIs.  */

static bool

is_sframe_abi_arch_aarch64 (sframe_decoder_ctx *sfd_ctx)

{

  bool aarch64_p = false;

  uint8_t abi_arch = sframe_decoder_get_abi_arch (sfd_ctx);

  if (abi_arch == SFRAME_ABI_AARCH64_ENDIAN_BIG

      || abi_arch == SFRAME_ABI_AARCH64_ENDIAN_LITTLE)

    aarch64_p = true;

  return aarch64_p;

}

static void

dump_sframe_header (sframe_decoder_ctx *sfd_ctx)

{

  const char *verstr = NULL;

  const sframe_header *header = &(sfd_ctx->sfd_header);

  /* Prepare SFrame section version string.  */

  const char *version_names[]

    = { "NULL",

  "SFRAME_VERSION_1" };

  unsigned char ver = header->sfh_preamble.sfp_version;

  if (ver <= SFRAME_VERSION)

    verstr = version_names[ver];

  /* Prepare SFrame section flags string.  */

  unsigned char flags = header->sfh_preamble.sfp_flags;

  char *flags_str

    = (char*) calloc (sizeof (char), SFRAME_HEADER_FLAGS_STR_MAX_LEN);

  if (flags)

    {

      const char *flag_names[]

  = { "SFRAME_F_FDE_SORTED",

      "SFRAME_F_FRAME_POINTER" };

      unsigned char flags = header->sfh_preamble.sfp_flags;

      if (flags & SFRAME_F_FDE_SORTED)

  strcpy (flags_str, flag_names[0]);

      if (flags & SFRAME_F_FRAME_POINTER)

  {

    if (strlen (flags_str) > 0)

      strcpy (flags_str, ",");

    strcpy (flags_str, flag_names[1]);

  }

    }

  else

    strcpy (flags_str, "NONE");

  const char* subsec_name = "Header";

  printf ("\n");

  printf ("  %s :\n", subsec_name);

  printf ("\n");

  printf ("    Version: %s\n", verstr);

  printf ("    Flags: %s\n", flags_str);

  printf ("    Num FDEs: %d\n", header->sfh_num_fdes);

  printf ("    Num FREs: %d\n", header->sfh_num_fres);

  free (flags_str);

}

static void

dump_sframe_func_with_fres (sframe_decoder_ctx *sfd_ctx,

          unsigned int funcidx,

          uint64_t sec_addr)

{

  uint32_t j = 0;

  uint32_t num_fres = 0;

  uint32_t func_size = 0;

  int32_t func_start_address = 0;

  unsigned char func_info = 0;

  uint64_t func_start_pc_vma = 0;

  uint64_t fre_start_pc_vma = 0;

  const char *base_reg_str[] = {"fp", "sp"};

  int32_t cfa_offset = 0;

  int32_t fp_offset = 0;

  int32_t ra_offset = 0;

  uint8_t base_reg_id = 0;

  int err[3] = {0, 0, 0};

  sframe_frame_row_entry fre;

  /* Get the SFrame function descriptor.  */

  sframe_decoder_get_funcdesc (sfd_ctx, funcidx, &num_fres,

             &func_size, &func_start_address, &func_info);

  /* Calculate the virtual memory address for function start pc.  */

  func_start_pc_vma = func_start_address + sec_addr;

  /* Mark FDEs with [m] where the FRE start address is interpreted as a

     mask.  */

  int fde_type_addrmask_p = (SFRAME_V1_FUNC_FDE_TYPE (func_info)

           == SFRAME_FDE_TYPE_PCMASK);

  const char *fde_type_marker

    = (fde_type_addrmask_p ? "[m]" : "   ");

  printf ("\n    func idx [%d]: pc = 0x%"PRIx64 ", size = %d bytes",

    funcidx,

    func_start_pc_vma,

    func_size);

  if (is_sframe_abi_arch_aarch64 (sfd_ctx)

      && (SFRAME_V1_FUNC_PAUTH_KEY (func_info) == SFRAME_AARCH64_PAUTH_KEY_B))

    printf (", pauth = B key");

  char temp[100];

  printf ("\n    %-7s%-8s %-10s%-10s%-13s",

    "STARTPC", fde_type_marker, "CFA", "FP", "RA");

  for (j = 0; j < num_fres; j++)

    {

      sframe_decoder_get_fre (sfd_ctx, funcidx, j, &fre);

      fre_start_pc_vma = (fde_type_addrmask_p

        ? fre.fre_start_addr

        : func_start_pc_vma + fre.fre_start_addr);

      /* FIXME - fixup the err caching in array.

   assert no error for base reg id.  */

      base_reg_id = sframe_fre_get_base_reg_id (&fre, &err[0]);

      cfa_offset = sframe_fre_get_cfa_offset (sfd_ctx, &fre, &err[0]);

      fp_offset = sframe_fre_get_fp_offset (sfd_ctx, &fre, &err[1]);

      ra_offset = sframe_fre_get_ra_offset (sfd_ctx, &fre, &err[2]);

      /* Dump CFA info.  */

      printf ("\n");

      printf ("    %016"PRIx64, fre_start_pc_vma);

      sprintf (temp, "%s+%d", base_reg_str[base_reg_id], cfa_offset);

      printf ("  %-10s", temp);

      /* Dump SP/FP info.  */

      if (err[1] == 0)

  sprintf (temp, "c%+d", fp_offset);

      else

  strcpy (temp, "u");

      printf ("%-10s", temp);

      /* Dump RA info.

   If an ABI does not track RA offset, e.g., AMD64, display a 'u',

   else display the offset d as 'c+-d'.  */

      if (sframe_decoder_get_fixed_ra_offset(sfd_ctx)

    != SFRAME_CFA_FIXED_RA_INVALID)

  strcpy (temp, "u");

      else if (err[2] == 0)

  sprintf (temp, "c%+d", ra_offset);

      /* Mark SFrame FRE's RA information with "[s]" if the RA is mangled

   with signature bits.  */

      const char *ra_mangled_p_str

  = ((sframe_fre_get_ra_mangled_p (sfd_ctx, &fre, &err[2]))

     ? "[s]" : "   ");

      strcat (temp, ra_mangled_p_str);

      printf ("%-13s", temp);

    }

}

static void

dump_sframe_functions (sframe_decoder_ctx *sfd_ctx, uint64_t sec_addr)

{

  uint32_t i;

  uint32_t num_fdes;

  const char* subsec_name = "Function Index";

  printf ("\n  %s :\n", subsec_name);

  num_fdes = sframe_decoder_get_num_fidx (sfd_ctx);

  for (i = 0; i < num_fdes; i++)

    {

      dump_sframe_func_with_fres (sfd_ctx, i, sec_addr);

      printf ("\n");

    }

}

void

dump_sframe (sframe_decoder_ctx *sfd_ctx, uint64_t sec_addr)

{

  dump_sframe_header (sfd_ctx);

  dump_sframe_functions (sfd_ctx, sec_addr);

}