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riscv/ftrace: Add RECORD_MCOUNT support

Now recordmcount.pl recognizes RISC-V object files. For the mechanism to work, we have to disable the linker relaxation.

Alan Kao committed 8 years ago

Commit a1d2a6b1 parent 0adb3283 files · +9 −0Browse files

Unified · Split

3 files
  1. arch/riscv/Kconfig +1 −0
  2. arch/riscv/Makefile +3 −0
  3. scripts/recordmcount.pl +5 −0
arch/riscv/Kconfig+1−0
@@ -114,6 +114,7 @@ config ARCH_RV64I · 113 unmodified lines
114114 select 64BIT
115115 select HAVE_FUNCTION_TRACER
116116 select HAVE_FUNCTION_GRAPH_TRACER
117+ select HAVE_FTRACE_MCOUNT_RECORD
117118
118119 endchoice
119120
arch/riscv/Makefile+3−0
@@ -11,6 +11,9 @@ · 10 unmodified lines
1111 LDFLAGS :=
1212 OBJCOPYFLAGS := -O binary
1313 LDFLAGS_vmlinux :=
14+ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
15+ LDFLAGS_vmlinux := --no-relax
16+endif
1417 KBUILD_AFLAGS_MODULE += -fPIC
1518 KBUILD_CFLAGS_MODULE += -fPIC
1619
scripts/recordmcount.pl+5−0
@@ -376,6 +376,11 @@ if ($arch eq "x86_64") { · 375 unmodified lines
376376 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s__mcount\$";
377377 $type = ".quad";
378378 $alignment = 8;
379+} elsif ($arch eq "riscv") {
380+ $function_regex = "^([0-9a-fA-F]+)\\s+<([^.0-9][0-9a-zA-Z_\\.]+)>:";
381+ $mcount_regex = "^\\s*([0-9a-fA-F]+):\\sR_RISCV_CALL\\s_mcount\$";
382+ $type = ".quad";
383+ $alignment = 2;
379384 } else {
380385 die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
381386 }