diff options
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/include/asm/ftrace.h | 2 | ||||
| -rw-r--r-- | arch/blackfin/kernel/ftrace-entry.S | 23 |
2 files changed, 13 insertions, 12 deletions
diff --git a/arch/blackfin/include/asm/ftrace.h b/arch/blackfin/include/asm/ftrace.h index 8643680f0f78..90c9b400ba6d 100644 --- a/arch/blackfin/include/asm/ftrace.h +++ b/arch/blackfin/include/asm/ftrace.h @@ -8,6 +8,6 @@ #ifndef __ASM_BFIN_FTRACE_H__ #define __ASM_BFIN_FTRACE_H__ -#define MCOUNT_INSN_SIZE 8 /* sizeof mcount call: LINK + CALL */ +#define MCOUNT_INSN_SIZE 6 /* sizeof "[++sp] = rets; call __mcount;" */ #endif diff --git a/arch/blackfin/kernel/ftrace-entry.S b/arch/blackfin/kernel/ftrace-entry.S index 6980b7a0615d..76dd4fbcd17a 100644 --- a/arch/blackfin/kernel/ftrace-entry.S +++ b/arch/blackfin/kernel/ftrace-entry.S @@ -17,8 +17,8 @@ * only one we can blow away. With pointer registers, we have P0-P2. * * Upon entry, the RETS will point to the top of the current profiled - * function. And since GCC setup the frame for us, the previous function - * will be waiting there. mmmm pie. + * function. And since GCC pushed the previous RETS for us, the previous + * function will be waiting there. mmmm pie. */ ENTRY(__mcount) /* save third function arg early so we can do testing below */ @@ -70,14 +70,14 @@ ENTRY(__mcount) /* setup the tracer function */ p0 = r3; - /* tracer(ulong frompc, ulong selfpc): - * frompc: the pc that did the call to ... - * selfpc: ... this location - * the selfpc itself will need adjusting for the mcount call + /* function_trace_call(unsigned long ip, unsigned long parent_ip): + * ip: this point was called by ... + * parent_ip: ... this function + * the ip itself will need adjusting for the mcount call */ - r1 = rets; - r0 = [fp + 4]; - r1 += -MCOUNT_INSN_SIZE; + r0 = rets; + r1 = [sp + 16]; /* skip the 4 local regs on stack */ + r0 += -MCOUNT_INSN_SIZE; /* call the tracer */ call (p0); @@ -106,9 +106,10 @@ ENTRY(_ftrace_graph_caller) [--sp] = r1; [--sp] = rets; - r0 = fp; + /* prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) */ + r0 = sp; r1 = rets; - r0 += 4; + r0 += 16; /* skip the 4 local regs on stack */ r1 += -MCOUNT_INSN_SIZE; call _prepare_ftrace_return; |