Make ENTROPY deterministic

Base it on the output filename, not the pid.  This still gets decent
coverage, but is deterministic.

diff --git a/isa/Makefile b/isa/Makefile
index f4dab3fdd23760d38f2f1bb40d38190e13d8a630..a13acd86cdcf6317c21301c5d0e7cf9c2bc7a82b 100644 (file)
--- a/isa/Makefile
+++ b/isa/Makefile
@@ -29,8 +29,7 @@ default: all
 
 RISCV_PREFIX ?= riscv$(XLEN)-unknown-elf-
 RISCV_GCC ?= $(RISCV_PREFIX)gcc
-ENTROPY ?= -DENTROPY=$(shell echo $$$$)
-RISCV_GCC_OPTS ?= $(ENTROPY) -static -mcmodel=medany -fvisibility=hidden -nostdlib -nostartfiles
+RISCV_GCC_OPTS ?= -static -mcmodel=medany -fvisibility=hidden -nostdlib -nostartfiles
 RISCV_OBJDUMP ?= $(RISCV_PREFIX)objdump --disassemble-all --disassemble-zeroes --section=.text --section=.text.startup --section=.text.init --section=.data
 RISCV_SIM ?= spike
 
@@ -55,7 +54,7 @@ $$($(1)_p_tests): $(1)-p-%: $(1)/%.S
 $(1)_tests += $$($(1)_p_tests)
 
 $$($(1)_v_tests): $(1)-v-%: $(1)/%.S
-       $$(RISCV_GCC) $(2) $$(RISCV_GCC_OPTS) -std=gnu99 -O2 -I$(src_dir)/../env/v -I$(src_dir)/macros/scalar -T$(src_dir)/../env/v/link.ld $(src_dir)/../env/v/entry.S $(src_dir)/../env/v/*.c $$< -lc -o $$@
+       $$(RISCV_GCC) $(2) $$(RISCV_GCC_OPTS) -DENTROPY=0x$$(shell echo \$$@ | md5sum | cut -c 1-7) -std=gnu99 -O2 -I$(src_dir)/../env/v -I$(src_dir)/macros/scalar -T$(src_dir)/../env/v/link.ld $(src_dir)/../env/v/entry.S $(src_dir)/../env/v/*.c $$< -lc -o $$@
 $(1)_tests += $$($(1)_v_tests)
 
 $(1)_tests_dump = $$(addsuffix .dump, $$($(1)_tests))