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author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-07 17:47:00 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-07 17:47:00 +0200 |
commit | e669830526a0abaf301bf408df69cde33901ac63 (patch) | |
tree | 0b6043375006d1754bbd1ab2370b0a0536546cc9 /arch/mips/kernel/ftrace.c | |
parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s39... (diff) | |
parent | Merge branch '3.16-fixes' into mips-for-linux-next (diff) | |
download | linux-e669830526a0abaf301bf408df69cde33901ac63.tar.xz linux-e669830526a0abaf301bf408df69cde33901ac63.zip |
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Pull MIPS updates from Ralf Baechle:
"This is the main pull request for 3.17. It contains:
- misc Cavium Octeon, BCM47xx, BCM63xx and Alchemy updates
- MIPS ptrace updates and cleanups
- various fixes that will also go to -stable
- a number of cleanups and small non-critical fixes.
- NUMA support for the Loongson 3.
- more support for MSA
- support for MAAR
- various FP enhancements and fixes"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (139 commits)
MIPS: jz4740: remove unnecessary null test before debugfs_remove
MIPS: Octeon: remove unnecessary null test before debugfs_remove_recursive
MIPS: ZBOOT: implement stack protector in compressed boot phase
MIPS: mipsreg: remove duplicate MIPS_CONF4_FTLBSETS_SHIFT
MIPS: Bonito64: remove a duplicate define
MIPS: Malta: initialise MAARs
MIPS: Initialise MAARs
MIPS: detect presence of MAARs
MIPS: define MAAR register accessors & bits
MIPS: mark MSA experimental
MIPS: Don't build MSA support unless it can be used
MIPS: consistently clear MSA flags when starting & copying threads
MIPS: 16 byte align MSA vector context
MIPS: disable preemption whilst initialising MSA
MIPS: ensure MSA gets disabled during boot
MIPS: fix read_msa_* & write_msa_* functions on non-MSA toolchains
MIPS: fix MSA context for tasks which don't use FP first
MIPS: init upper 64b of vector registers when MSA is first used
MIPS: save/disable MSA in lose_fpu
MIPS: preserve scalar FP CSR when switching vector context
...
Diffstat (limited to 'arch/mips/kernel/ftrace.c')
-rw-r--r-- | arch/mips/kernel/ftrace.c | 56 |
1 files changed, 47 insertions, 9 deletions
diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c index 8b6538750fe1..937c54bc8ccc 100644 --- a/arch/mips/kernel/ftrace.c +++ b/arch/mips/kernel/ftrace.c @@ -63,7 +63,7 @@ static inline int in_kernel_space(unsigned long ip) ((unsigned int)(JAL | (((addr) >> 2) & ADDR_MASK))) static unsigned int insn_jal_ftrace_caller __read_mostly; -static unsigned int insn_lui_v1_hi16_mcount __read_mostly; +static unsigned int insn_la_mcount[2] __read_mostly; static unsigned int insn_j_ftrace_graph_caller __maybe_unused __read_mostly; static inline void ftrace_dyn_arch_init_insns(void) @@ -71,10 +71,10 @@ static inline void ftrace_dyn_arch_init_insns(void) u32 *buf; unsigned int v1; - /* lui v1, hi16_mcount */ + /* la v1, _mcount */ v1 = 3; - buf = (u32 *)&insn_lui_v1_hi16_mcount; - UASM_i_LA_mostly(&buf, v1, MCOUNT_ADDR); + buf = (u32 *)&insn_la_mcount[0]; + UASM_i_LA(&buf, v1, MCOUNT_ADDR); /* jal (ftrace_caller + 8), jump over the first two instruction */ buf = (u32 *)&insn_jal_ftrace_caller; @@ -111,14 +111,47 @@ static int ftrace_modify_code_2(unsigned long ip, unsigned int new_code1, unsigned int new_code2) { int faulted; + mm_segment_t old_fs; safe_store_code(new_code1, ip, faulted); if (unlikely(faulted)) return -EFAULT; - safe_store_code(new_code2, ip + 4, faulted); + + ip += 4; + safe_store_code(new_code2, ip, faulted); if (unlikely(faulted)) return -EFAULT; + + ip -= 4; + old_fs = get_fs(); + set_fs(get_ds()); flush_icache_range(ip, ip + 8); + set_fs(old_fs); + + return 0; +} + +static int ftrace_modify_code_2r(unsigned long ip, unsigned int new_code1, + unsigned int new_code2) +{ + int faulted; + mm_segment_t old_fs; + + ip += 4; + safe_store_code(new_code2, ip, faulted); + if (unlikely(faulted)) + return -EFAULT; + + ip -= 4; + safe_store_code(new_code1, ip, faulted); + if (unlikely(faulted)) + return -EFAULT; + + old_fs = get_fs(); + set_fs(get_ds()); + flush_icache_range(ip, ip + 8); + set_fs(old_fs); + return 0; } #endif @@ -130,13 +163,14 @@ static int ftrace_modify_code_2(unsigned long ip, unsigned int new_code1, * * move at, ra * jal _mcount --> nop + * sub sp, sp, 8 --> nop (CONFIG_32BIT) * * 2. For modules: * * 2.1 For KBUILD_MCOUNT_RA_ADDRESS and CONFIG_32BIT * * lui v1, hi_16bit_of_mcount --> b 1f (0x10000005) - * addiu v1, v1, low_16bit_of_mcount + * addiu v1, v1, low_16bit_of_mcount --> nop (CONFIG_32BIT) * move at, ra * move $12, ra_address * jalr v1 @@ -145,7 +179,7 @@ static int ftrace_modify_code_2(unsigned long ip, unsigned int new_code1, * 2.2 For the Other situations * * lui v1, hi_16bit_of_mcount --> b 1f (0x10000004) - * addiu v1, v1, low_16bit_of_mcount + * addiu v1, v1, low_16bit_of_mcount --> nop (CONFIG_32BIT) * move at, ra * jalr v1 * nop | move $12, ra_address | sub sp, sp, 8 @@ -184,10 +218,14 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) unsigned int new; unsigned long ip = rec->ip; - new = in_kernel_space(ip) ? insn_jal_ftrace_caller : - insn_lui_v1_hi16_mcount; + new = in_kernel_space(ip) ? insn_jal_ftrace_caller : insn_la_mcount[0]; +#ifdef CONFIG_64BIT return ftrace_modify_code(ip, new); +#else + return ftrace_modify_code_2r(ip, new, in_kernel_space(ip) ? + INSN_NOP : insn_la_mcount[1]); +#endif } #define FTRACE_CALL_IP ((unsigned long)(&ftrace_call)) |