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authorAndrew Waterman <andrew@sifive.com>2016-12-18 22:53:50 -0800
committerAlan Modra <amodra@gmail.com>2016-12-20 12:26:34 +1030
commit2922d21da14b4711872371abacb16e8ab7c70894 (patch)
tree42987b9714a1c6641f3bc74c4a7e7230936545ff /binutils
parent1d61f7949f77796ee407466f3ca7f42dcde9251b (diff)
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Re-work RISC-V gas flags: now we just support -mabi and -march
We've decided to standardize on two flags for RISC-V: "-march" sets the target architecture (which determines which instructions can be generated), and "-mabi" sets the target ABI. We needed to rework this because the old flag set didn't support soft-float or single-float ABIs, and didn't support an x32-style ABI on RISC-V. Additionally, we've changed the behavior of the -march flag: it's now a lot stricter and only parses things we can actually understand. Additionally, it's now lowercase-only: the rationale is that while the RISC-V ISA manual specifies that ISA strings are case-insensitive, in Linux-land things are usually case-sensitive. Since this flag can be used to determine library paths, we didn't want to bake some case-insensitivity in there that would case trouble later. This patch implements these two new flags and removes the old flags that could conflict with these. There wasn't a RISC-V release before, so we want to just support a clean flag set. include/ * elf/riscv.h (EF_RISCV_SOFT_FLOAT): Don't define. (EF_RISCV_FLOAT_ABI, EF_RISCV_FLOAT_ABI_SOFT): Define. (EF_RISCV_FLOAT_ABI_SINGLE, EF_RISCV_FLOAT_ABI_DOUBLE): Define. (EF_RISCV_FLOAT_ABI_QUAD): Define. bfd/ * elfnn-riscv.c (_bfd_riscv_elf_merge_private_bfd_data): Use EF_RISCV_FLOAT_ABI_SOFT instead of EF_RISCV_SOFT_FLOAT. binutils/ * readelf.c (get_machine_flags): Use EF_RISCV_FLOAT_ABI_{SOFT,SINGLE,DOBULE,QUAD) instead of EF_RISCV_{SOFT,HARD}_FLOAT. gas/ * config/tc-riscv.h (xlen): Delete. * config/tc-riscv.c (xlen): Make static. (abi_xlen): New variable. (options): Replace OPTION_{M32,M64,MSOFT_FLOAT,MHARD_FLOAT,MRVC} with OPTION_MABI. (md_longopts): Likewise. (md_parse_option): Likewise. (riscv_elf_final_processing): Likewise. * doc/as.texinfo (Target RISC-V options): Likewise. * doc/c-riscv.texi (OPTIONS): Likewise. * config/tc-riscv.c (float_mode): Removed. (float_abi): New type, specifies the floating-point ABI. (riscv_set_abi): New function. (riscv_add_subset): Only allow lower-case ISA names and require them to start with "rv". (riscv_after_parse_args): Likewise. opcodes/ * riscv-dis.c (riscv_disassemble_insn): Default to the ELF's XLEN when none is provided.
Diffstat (limited to 'binutils')
-rw-r--r--binutils/ChangeLog6
-rw-r--r--binutils/readelf.c21
2 files changed, 25 insertions, 2 deletions
diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 057e309..fd86ed5 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,9 @@
+2016-12-20 Andrew Waterman <andrew@sifive.com>
+
+ * readelf.c (get_machine_flags): Use
+ EF_RISCV_FLOAT_ABI_{SOFT,SINGLE,DOBULE,QUAD) instead of
+ EF_RISCV_{SOFT,HARD}_FLOAT.
+
2016-12-14 Maciej W. Rozycki <macro@imgtec.com>
* testsuite/binutils-all/mips/mips-ase-1.d: New test.
diff --git a/binutils/readelf.c b/binutils/readelf.c
index c8e9726..873a471 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -3317,8 +3317,25 @@ get_machine_flags (unsigned e_flags, unsigned e_machine)
case EM_RISCV:
if (e_flags & EF_RISCV_RVC)
strcat (buf, ", RVC");
- if (e_flags & EF_RISCV_SOFT_FLOAT)
- strcat (buf, ", soft-float ABI");
+
+ switch (e_flags & EF_RISCV_FLOAT_ABI)
+ {
+ case EF_RISCV_FLOAT_ABI_SOFT:
+ strcat (buf, ", soft-float ABI");
+ break;
+
+ case EF_RISCV_FLOAT_ABI_SINGLE:
+ strcat (buf, ", single-float ABI");
+ break;
+
+ case EF_RISCV_FLOAT_ABI_DOUBLE:
+ strcat (buf, ", double-float ABI");
+ break;
+
+ case EF_RISCV_FLOAT_ABI_QUAD:
+ strcat (buf, ", quad-float ABI");
+ break;
+ }
break;
case EM_SH: