diff options
| author | David Daney <ddaney@caviumnetworks.com> | 2010-12-28 13:21:37 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2011-05-10 18:15:22 +0100 |
| commit | c54794d19e61472156e37263c074225574c80df1 (patch) | |
| tree | 9d118fb5d37ffae76dbe55d6a25c5d5999a3108f /arch/mips/kernel/ftrace.c | |
| parent | 693d92a1bbc9e42681c42ed190bd42b636ca876f (diff) | |
| download | op-kernel-dev-c54794d19e61472156e37263c074225574c80df1.zip op-kernel-dev-c54794d19e61472156e37263c074225574c80df1.tar.gz | |
MIPS: Mask jump target in ftrace_dyn_arch_init_insns().
The current code is abusing the uasm interface by passing jump target
addresses with high bits set. Mask the addresses to avoid annoying
messages at boot time.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/1922/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/ftrace.c')
| -rw-r--r-- | arch/mips/kernel/ftrace.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c index 94ca2b0..feb8021 100644 --- a/arch/mips/kernel/ftrace.c +++ b/arch/mips/kernel/ftrace.c @@ -23,6 +23,7 @@ #define JAL 0x0c000000 /* jump & link: ip --> ra, jump to target */ #define ADDR_MASK 0x03ffffff /* op_code|addr : 31...26|25 ....0 */ +#define JUMP_RANGE_MASK ((1UL << 28) - 1) #define INSN_NOP 0x00000000 /* nop */ #define INSN_JAL(addr) \ @@ -44,12 +45,12 @@ static inline void ftrace_dyn_arch_init_insns(void) /* jal (ftrace_caller + 8), jump over the first two instruction */ buf = (u32 *)&insn_jal_ftrace_caller; - uasm_i_jal(&buf, (FTRACE_ADDR + 8)); + uasm_i_jal(&buf, (FTRACE_ADDR + 8) & JUMP_RANGE_MASK); #ifdef CONFIG_FUNCTION_GRAPH_TRACER /* j ftrace_graph_caller */ buf = (u32 *)&insn_j_ftrace_graph_caller; - uasm_i_j(&buf, (unsigned long)ftrace_graph_caller); + uasm_i_j(&buf, (unsigned long)ftrace_graph_caller & JUMP_RANGE_MASK); #endif } |
