diff options
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/sparc/lib/mcount.S | 22 |
2 files changed, 16 insertions, 7 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 6db513674050..035304c30ab4 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -37,6 +37,7 @@ config SPARC64 def_bool 64BIT select ARCH_SUPPORTS_MSI select HAVE_FUNCTION_TRACER + select HAVE_FUNCTION_TRACE_MCOUNT_TEST select HAVE_KRETPROBES select HAVE_KPROBES select HAVE_LMB diff --git a/arch/sparc/lib/mcount.S b/arch/sparc/lib/mcount.S index 24b8b12deed2..7047997be0eb 100644 --- a/arch/sparc/lib/mcount.S +++ b/arch/sparc/lib/mcount.S @@ -96,13 +96,12 @@ mcount: #endif #ifdef CONFIG_FUNCTION_TRACER #ifdef CONFIG_DYNAMIC_FTRACE - mov %o7, %o0 - .globl mcount_call -mcount_call: - call ftrace_stub - mov %o0, %o7 + /* Do nothing, the retl/nop below is all we need. */ #else - sethi %hi(ftrace_trace_function), %g1 + sethi %hi(function_trace_stop), %g1 + lduw [%g1 + %lo(function_trace_stop)], %g2 + brnz,pn %g2, 1f + sethi %hi(ftrace_trace_function), %g1 sethi %hi(ftrace_stub), %g2 ldx [%g1 + %lo(ftrace_trace_function)], %g1 or %g2, %lo(ftrace_stub), %g2 @@ -131,14 +130,23 @@ ftrace_stub: .globl ftrace_caller .type ftrace_caller,#function ftrace_caller: + sethi %hi(function_trace_stop), %g1 mov %i7, %o1 - mov %o7, %o0 + lduw [%g1 + %lo(function_trace_stop)], %g2 + brnz,pn %g2, ftrace_stub + mov %o7, %o0 .globl ftrace_call ftrace_call: + /* If the final kernel link ever turns on relaxation, we'll need + * to do something about this tail call. Otherwise the linker + * will rewrite the call into a branch and nop out the move + * instruction. + */ call ftrace_stub mov %o0, %o7 retl nop + .size ftrace_call,.-ftrace_call .size ftrace_caller,.-ftrace_caller #endif #endif |