From f9d8678db43c533cf08c84ae4ebc85738ff113ea Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Sat, 29 Jun 2019 11:41:26 -0400
Subject: Additional fixes

Rearrange gbafix to not modify file in the event of failure
Fix bug where Dma3Manager may get stuck when compiled with gcc-9.1.0
---
 tools/gbafix/gbafix.c | 41 ++++++++++++++++++++++++-----------------
 1 file changed, 24 insertions(+), 17 deletions(-)

(limited to 'tools')

diff --git a/tools/gbafix/gbafix.c b/tools/gbafix/gbafix.c
index b4ad15a88..179305b1b 100644
--- a/tools/gbafix/gbafix.c
+++ b/tools/gbafix/gbafix.c
@@ -138,6 +138,7 @@ int main(int argc, char *argv[])
     char *argfile = 0;
     FILE *infile;
     int silent = 0;
+    int schedule_pad = 0;
 
     int size,bit;
 
@@ -172,28 +173,27 @@ int main(int argc, char *argv[])
         return -1;
     }
 
+    uint32_t sh_offset = 0;
+
     // read file
     infile = fopen(argfile, "r+b");
     if (!infile) { fprintf(stderr, "Error opening input file!\n"); return -1; }
-    fseek(infile, 0, SEEK_SET);
+    fseek(infile, sh_offset, SEEK_SET);
     fread(&header, sizeof(header), 1, infile);
 
     // elf check
-    uint32_t sh_offset = 0;
+    Elf32_Shdr secHeader;
     if (memcmp(&header, ELFMAG, 4) == 0) {
         Elf32_Ehdr *elfHeader = (Elf32_Ehdr *)&header;
         fseek(infile, elfHeader->e_shoff, SEEK_SET);
         int i;
         for (i = 0; i < elfHeader->e_shnum; i++) {
-            Elf32_Shdr secHeader;
             fread(&secHeader, sizeof(Elf32_Shdr), 1, infile);
-            if (secHeader.sh_type == SHT_PROGBITS && secHeader.sh_addr == elfHeader->e_entry) {
-                fseek(infile, secHeader.sh_offset, SEEK_SET);
-                sh_offset = secHeader.sh_offset;
-                break;
-            }
+            if (secHeader.sh_type == SHT_PROGBITS && secHeader.sh_addr == elfHeader->e_entry) break;
         }
         if (i == elfHeader->e_shnum) { fprintf(stderr, "Error finding entry point!\n"); return 1; }
+        fseek(infile, secHeader.sh_offset, SEEK_SET);
+        sh_offset = secHeader.sh_offset;
         fread(&header, sizeof(header), 1, infile);
     }
 
@@ -211,15 +211,7 @@ int main(int argc, char *argv[])
             {
                 case 'p':    // pad
                 {
-                    fseek(infile, 0, SEEK_END);
-                    size = ftell(infile);
-                    for (bit=31; bit>=0; bit--) if (size & (1<<bit)) break;
-                    if (size != (1<<bit))
-                    {
-                        int todo = (1<<(bit+1)) - size;
-                        while (todo--) fputc(0xFF, infile);
-                    }
-                    fseek(infile, 0, SEEK_SET);
+                    schedule_pad = 1;
                     break;
                 }
 
@@ -299,6 +291,21 @@ int main(int argc, char *argv[])
     header.complement = HeaderComplement();
     //header.checksum = checksum_without_header + HeaderChecksum();
 
+    if (schedule_pad) {
+        if (sh_offset != 0) {
+            fprintf(stderr, "Warning: Cannot safely pad an ELF\n");
+        } else {
+            fseek(infile, 0, SEEK_END);
+            size = ftell(infile);
+            for (bit=31; bit>=0; bit--) if (size & (1<<bit)) break;
+            if (size != (1<<bit))
+            {
+                int todo = (1<<(bit+1)) - size;
+                while (todo--) fputc(0xFF, infile);
+            }
+        }
+    }
+
     fseek(infile, sh_offset, SEEK_SET);
     fwrite(&header, sizeof(header), 1, infile);
     fclose(infile);
-- 
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