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authorAndrew Burgess <andrew.burgess@embecosm.com>2016-03-15 21:38:30 +0000
committerAndrew Burgess <andrew.burgess@embecosm.com>2016-03-21 16:44:49 +0000
commita9522a2168c8233e8f15c42a32e7376c2a40ac12 (patch)
tree9473adba31cd236816ce37b27f9994486fb9252d /include
parentc0334580516d147fb0257a2df47ac7b1072f6e82 (diff)
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arc: Remove EF_ARC_CPU_GENERIC constant.
The constant EF_ARC_CPU_GENERIC is defined in the include/elf/arc.h file, and is used in a few places in binutils, however, this constant should never make it into the elf header flags; we always set a valid cpu type in the assembler, which should then be copied over during linking. There are some non-gnu arc compilers that don't write an architecture type into the e_flags field, instead leaving the field as 0, which is the EF_ARC_CPU_GENERIC value. This non-gnu compiler uses the machine type to distinguish between the old and newer arc architectures, setting the machine type to EM_ARC_COMPACT for old arc600, arc601, and arc700 architectures, while using EM_ARC_COMPACT2 for newer arcem and archs architectures. Previously when displaying the machine flags for an older EM_ARC_COMPACT machine, if the e_flags had not been filled in, then we relied on the default case statement to display the message "Generic ARCompact", while in the EM_ARC_COMPACT2 case we specifically handled EF_ARC_CPU_GENERIC to print "ARC Generic", leaving the default case to print a message about unrecognised cpu flag. After this commit EF_ARC_CPU_GENERIC has been removed, for both machine types EM_ARC_COMPACT and EM_ARC_COMPACT2 we now rely on the default case statement to handle the situation where the e_flags has not been filled in. The message displayed is now "Unknown ARCompact" (for older arc architectures) and "Unknown ARC" (for the newer architectures). The switch from "Generic" to "Unknown" in the message string is for clarity, calling the file "Generic" can give the impression that the file is compiled for a common sub-set of the architectures, and would therefore run on any type of machine (or at least any type of new or old machine depending on if the machine type is ARC or ARCv2). However, this was not what "Generic" meant, it really meant "Unknown", so that's what we now say. As part of the merging of the readelf flag reading code, I have unified the strings used in displaying the ELF ABI. This means that for older arc machines (arc600, arc601, and arc700) the string used for the original ABI, and ABIv2 have changed, the current ABIv3 remains the same. For the newer architectures (arcem and archs) the abi strings remain unchanged in all cases. bfd/ChangeLog: * elf32-arc.c (arc_elf_print_private_bfd_data): Remove use of EF_ARC_CPU_GENERIC. (arc_elf_final_write_processing): Don't bother setting cpu field in e_flags, this will have been set elsewhere. binutils/ChangeLog: * readelf.c (get_machine_flags): Move arc processing into... (decode_ARC_machine_flags): ... new function. Remove use of EF_ARC_CPU_GENERIC, change default case from "generic arc" to "unknown arc". Merged ABI printing between two machine types. gas/ChangeLog: * config/tc-arc.c (arc_select_cpu): Remove use of EF_ARC_CPU_GENERIC. include/ChangeLog: * elf/arc.h (EF_ARC_CPU_GENERIC): Delete. Update related comment.
Diffstat (limited to 'include')
-rw-r--r--include/ChangeLog4
-rw-r--r--include/elf/arc.h6
2 files changed, 6 insertions, 4 deletions
diff --git a/include/ChangeLog b/include/ChangeLog
index 7ce9cfa..c8d14d6 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,5 +1,9 @@
2016-03-21 Andrew Burgess <andrew.burgess@embecosm.com>
+ * elf/arc.h (EF_ARC_CPU_GENERIC): Delete. Update related comment.
+
+2016-03-21 Andrew Burgess <andrew.burgess@embecosm.com>
+
* elf/arc.h (EF_ARC_MACH): Delete.
(EF_ARC_MACH_MSK): Remove out of date comment.
diff --git a/include/elf/arc.h b/include/elf/arc.h
index 0b75465..47381f3 100644
--- a/include/elf/arc.h
+++ b/include/elf/arc.h
@@ -43,13 +43,11 @@ END_RELOC_NUMBERS (R_ARC_max)
#define EF_ARC_OSABI_MSK 0x00000f00
#define EF_ARC_ALL_MSK (EF_ARC_MACH_MSK | EF_ARC_OSABI_MSK)
-/* Various CPU types. */
+/* Various CPU types. These numbers are exposed in the ELF header flags
+ (e_flags field), and so must never change. */
#define E_ARC_MACH_ARC600 0x00000002
#define E_ARC_MACH_ARC601 0x00000004
#define E_ARC_MACH_ARC700 0x00000003
-
-/* Processor specific flags for the ELF header e_flags field. */
-#define EF_ARC_CPU_GENERIC 0x00000000
#define EF_ARC_CPU_ARCV2EM 0x00000005
#define EF_ARC_CPU_ARCV2HS 0x00000006