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Message-ID: <3F996D88.9060505@redhat.com>
Date: Fri, 24 Oct 2003 18:20:00 -0000
From: "J. Johnston" <jjohnstn@redhat.com>
Organization: Red Hat Inc.
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To: Kevin Buettner <kevinb@redhat.com>
Cc: gdb-patches@sources.redhat.com, ac131313@redhat.com
Subject: Re: RFA: ia64 portion of libunwind patch
References: <3F986E31.8050201@redhat.com> <1031024175718.ZM3475@localhost.localdomain>
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Kevin Buettner wrote:
> On Oct 23,  8:11pm, J. Johnston wrote:
> 
> 
>>Ok to commit?  Questions regarding this in conjunction with the generic 
>>libunwind frame code?
> 
> 
>>+#ifdef HAVE_LIBUNWIND_IA64_H
>>+
>>+# ifndef __NR_getunwind
>>+#  define __NR_getunwind	1215
>>+# endif
> 
> 
> Is this part still needed?
>

Not if we include <sys/syscall.h>

>                         ...........
> 
> 
>>+static void *
>>+map_segment (bfd *bfd, Elf_Internal_Phdr *p_text, struct map_info *mi)
>>+  {
>>+  size_t page_mask = getpagesize () - 1, nbytes;
>>+  char *buf, *cp;
>>+  ssize_t nread;
>>+  int fd;
>>+  
>>+  if (bfd->iostream)
>>+    fd = fileno (bfd->iostream);
>>+  else
>>+    fd = open (bfd_get_filename (bfd), O_RDONLY);
>>+  
>>+  if (fd < 0)
>>+    return NULL;
>>+
>>+  buf = mmap (0, p_text->p_filesz, PROT_READ, MAP_PRIVATE, fd,
>>+	      p_text->p_offset & ~page_mask);
>>+  if (buf != (char *) -1)
>>+    {
>>+      mi->buf = buf;
>>+      mi->length = p_text->p_filesz;
>>+      mi->mapped = 1;
>>+      buf += p_text->p_offset & page_mask;
>>+    }
>>+  else
>>+    {
>>+      /* mmap () failed, try reading the file: */
>>+      mi->mapped = 0;
>>+      
>>+      if (lseek (fd, p_text->p_offset, SEEK_SET) < 0)
>>+	{
>>+	  if (!bfd->iostream)
>>+	    close (fd);
>>+	  return NULL;
>>+	}
>>+      
>>+      nbytes = p_text->p_filesz;
>>+      cp = buf = xmalloc (nbytes);
>>+      while ((nbytes > 0) && (nread = read (fd, cp, nbytes)) > 0)
>>+	{
>>+	  cp += nread;
>>+	  nbytes -= nread;
>>+  	}
>>+      if (nbytes > 0)
>>+	{
>>+	  /* premature end-of-file or some error */
>>+	  xfree (buf);
>>+	  buf = 0;
>>+	}
>>+      mi->buf = buf;
>>+    }
>>+  if (!bfd->iostream)
>>+    close (fd);
>>+  
>>+  return buf;
>>+}
> 
> 
> For the above, why isn't bfd being employed to read the segment?
>

Are you referring to using bfd_bread() if the mmap fails or do you mean 
something higher level?

-- Jeff J.