binutils/readelf: handle AMDGPU OS ABIs

When the machine is EM_AMDGPU, handle the various OS ABIs described
here:

  https://llvm.org/docs/AMDGPUUsage.html#header

For a binary with the HSA OS ABI, the change looks like:

-  OS/ABI:                            <unknown: 40>
+  OS/ABI:                            AMD HSA

binutils/ChangeLog:

	* readelf.c (get_osabi_name): Handle EM_AMDGPU OS ABIs.

include/ChangeLog:

	* elf/common.h (ELFOSABI_AMDGPU_PAL, ELFOSABI_AMDGPU_MESA3D):
	New.

Change-Id: I383590c390f7dc2fe0f902f50038735626d71863

binutils/ChangeLog

@@ -1,3 +1,7 @@
+2022-03-16  Simon Marchi  <simon.marchi@efficios.com>
+
+	* readelf.c (get_osabi_name): Handle EM_AMDGPU OS ABIs.
+
 2022-03-16  Nick Clifton  <nickc@redhat.com>
 
 	* po/sr.po: Updated Serbian translation.

binutils/readelf.c

@@ -4284,6 +4284,17 @@ get_osabi_name (Filedata * filedata, unsigned int osabi)
       if (osabi >= 64)
 	switch (filedata->file_header.e_machine)
 	  {
+	  case EM_AMDGPU:
+	    switch (osabi)
+	      {
+	      case ELFOSABI_AMDGPU_HSA:    return "AMD HSA";
+	      case ELFOSABI_AMDGPU_PAL:    return "AMD PAL";
+	      case ELFOSABI_AMDGPU_MESA3D: return "AMD Mesa3D";
+	      default:
+		break;
+	      }
+	    break;
+
 	  case EM_ARM:
 	    switch (osabi)
 	      {

include/ChangeLog

@@ -1,3 +1,8 @@
+2022-03-16  Simon Marchi  <simon.marchi@efficios.com>
+
+	* elf/common.h (ELFOSABI_AMDGPU_PAL, ELFOSABI_AMDGPU_MESA3D):
+	New.
+
 2022-03-16  Simon Marchi  <simon.marchi@efficios.com>
 
 	* elf/amdgpu.h: New.

include/elf/common.h

@@ -79,7 +79,9 @@
 #define ELFOSABI_C6000_ELFABI 64 /* Bare-metal TMS320C6000 */
 #define ELFOSABI_AMDGPU_HSA  64 /* AMD HSA Runtime */
 #define ELFOSABI_C6000_LINUX 65 /* Linux TMS320C6000 */
+#define ELFOSABI_AMDGPU_PAL  65 /* AMD PAL Runtime */
 #define ELFOSABI_ARM_FDPIC   65 /* ARM FDPIC */
+#define ELFOSABI_AMDGPU_MESA3D 66 /* AMD Mesa3D Runtime */
 #define ELFOSABI_ARM	     97	/* ARM */
 #define ELFOSABI_STANDALONE 255	/* Standalone (embedded) application */