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author | Jordan Niethe <jniethe5@gmail.com> | 2020-06-02 07:27:25 +0200 |
---|---|---|
committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-23 09:41:36 +0200 |
commit | 50428fdc53ba48f6936b10dfdc0d644972403908 (patch) | |
tree | a82d65170f5ff8f07c1c6e706724efb455e30452 /arch | |
parent | powerpc/sstep: Add tests for Prefixed Add Immediate (diff) | |
download | linux-50428fdc53ba48f6936b10dfdc0d644972403908.tar.xz linux-50428fdc53ba48f6936b10dfdc0d644972403908.zip |
powerpc: Add a ppc_inst_as_str() helper
There are quite a few places where instructions are printed, this is
done using a '%x' format specifier. With the introduction of prefixed
instructions, this does not work well. Currently in these places,
ppc_inst_val() is used for the value for %x so only the first word of
prefixed instructions are printed.
When the instructions are word instructions, only a single word should
be printed. For prefixed instructions both the prefix and suffix should
be printed. To accommodate both of these situations, instead of a '%x'
specifier use '%s' and introduce a helper, __ppc_inst_as_str() which
returns a char *. The char * __ppc_inst_as_str() returns is buffer that
is passed to it by the caller.
It is cumbersome to require every caller of __ppc_inst_as_str() to now
declare a buffer. To make it more convenient to use __ppc_inst_as_str(),
wrap it in a macro that uses a compound statement to allocate a buffer
on the caller's stack before calling it.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Acked-by: Segher Boessenkool <segher@kernel.crashing.org>
[mpe: Drop 0x prefix to match most existings uses, especially xmon]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200602052728.18227-1-jniethe5@gmail.com
Diffstat (limited to 'arch')
-rw-r--r-- | arch/powerpc/include/asm/inst.h | 19 | ||||
-rw-r--r-- | arch/powerpc/kernel/kprobes.c | 2 | ||||
-rw-r--r-- | arch/powerpc/kernel/trace/ftrace.c | 26 | ||||
-rw-r--r-- | arch/powerpc/lib/test_emulate_step.c | 4 | ||||
-rw-r--r-- | arch/powerpc/xmon/xmon.c | 2 |
5 files changed, 36 insertions, 17 deletions
diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h index 45f3ec868258..cc73c1267572 100644 --- a/arch/powerpc/include/asm/inst.h +++ b/arch/powerpc/include/asm/inst.h @@ -122,6 +122,25 @@ static inline u64 ppc_inst_as_u64(struct ppc_inst x) #endif } +#define PPC_INST_STR_LEN sizeof("00000000 00000000") + +static inline char *__ppc_inst_as_str(char str[PPC_INST_STR_LEN], struct ppc_inst x) +{ + if (ppc_inst_prefixed(x)) + sprintf(str, "%08x %08x", ppc_inst_val(x), ppc_inst_suffix(x)); + else + sprintf(str, "%08x", ppc_inst_val(x)); + + return str; +} + +#define ppc_inst_as_str(x) \ +({ \ + char __str[PPC_INST_STR_LEN]; \ + __ppc_inst_as_str(__str, x); \ + __str; \ +}) + int probe_user_read_inst(struct ppc_inst *inst, struct ppc_inst __user *nip); diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index 9cc792a3a6a9..6ab9b4d037c3 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -244,7 +244,7 @@ static int try_to_emulate(struct kprobe *p, struct pt_regs *regs) * So, we should never get here... but, its still * good to catch them, just in case... */ - printk("Can't step on instruction %x\n", ppc_inst_val(insn)); + printk("Can't step on instruction %s\n", ppc_inst_as_str(insn)); BUG(); } else { /* diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c index c1fede6ec934..42761ebec9f7 100644 --- a/arch/powerpc/kernel/trace/ftrace.c +++ b/arch/powerpc/kernel/trace/ftrace.c @@ -73,8 +73,8 @@ ftrace_modify_code(unsigned long ip, struct ppc_inst old, struct ppc_inst new) /* Make sure it is what we expect it to be */ if (!ppc_inst_equal(replaced, old)) { - pr_err("%p: replaced (%#x) != old (%#x)", - (void *)ip, ppc_inst_val(replaced), ppc_inst_val(old)); + pr_err("%p: replaced (%s) != old (%s)", + (void *)ip, ppc_inst_as_str(replaced), ppc_inst_as_str(old)); return -EINVAL; } @@ -137,7 +137,7 @@ __ftrace_make_nop(struct module *mod, /* Make sure that that this is still a 24bit jump */ if (!is_bl_op(op)) { - pr_err("Not expected bl: opcode is %x\n", ppc_inst_val(op)); + pr_err("Not expected bl: opcode is %s\n", ppc_inst_as_str(op)); return -EINVAL; } @@ -172,8 +172,8 @@ __ftrace_make_nop(struct module *mod, /* We expect either a mflr r0, or a std r0, LRSAVE(r1) */ if (!ppc_inst_equal(op, ppc_inst(PPC_INST_MFLR)) && !ppc_inst_equal(op, ppc_inst(PPC_INST_STD_LR))) { - pr_err("Unexpected instruction %08x around bl _mcount\n", - ppc_inst_val(op)); + pr_err("Unexpected instruction %s around bl _mcount\n", + ppc_inst_as_str(op)); return -EINVAL; } #else @@ -203,7 +203,7 @@ __ftrace_make_nop(struct module *mod, } if (!ppc_inst_equal(op, ppc_inst(PPC_INST_LD_TOC))) { - pr_err("Expected %08x found %08x\n", PPC_INST_LD_TOC, ppc_inst_val(op)); + pr_err("Expected %08x found %s\n", PPC_INST_LD_TOC, ppc_inst_as_str(op)); return -EINVAL; } #endif /* CONFIG_MPROFILE_KERNEL */ @@ -231,7 +231,7 @@ __ftrace_make_nop(struct module *mod, /* Make sure that that this is still a 24bit jump */ if (!is_bl_op(op)) { - pr_err("Not expected bl: opcode is %x\n", ppc_inst_val(op)); + pr_err("Not expected bl: opcode is %s\n", ppc_inst_as_str(op)); return -EINVAL; } @@ -406,7 +406,7 @@ static int __ftrace_make_nop_kernel(struct dyn_ftrace *rec, unsigned long addr) /* Make sure that that this is still a 24bit jump */ if (!is_bl_op(op)) { - pr_err("Not expected bl: opcode is %x\n", ppc_inst_val(op)); + pr_err("Not expected bl: opcode is %s\n", ppc_inst_as_str(op)); return -EINVAL; } @@ -533,8 +533,8 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) return -EFAULT; if (!expected_nop_sequence(ip, op[0], op[1])) { - pr_err("Unexpected call sequence at %p: %x %x\n", - ip, ppc_inst_val(op[0]), ppc_inst_val(op[1])); + pr_err("Unexpected call sequence at %p: %s %s\n", + ip, ppc_inst_as_str(op[0]), ppc_inst_as_str(op[1])); return -EINVAL; } @@ -597,7 +597,7 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) /* It should be pointing to a nop */ if (!ppc_inst_equal(op, ppc_inst(PPC_INST_NOP))) { - pr_err("Expected NOP but have %x\n", ppc_inst_val(op)); + pr_err("Expected NOP but have %s\n", ppc_inst_as_str(op)); return -EINVAL; } @@ -654,7 +654,7 @@ static int __ftrace_make_call_kernel(struct dyn_ftrace *rec, unsigned long addr) } if (!ppc_inst_equal(op, ppc_inst(PPC_INST_NOP))) { - pr_err("Unexpected call sequence at %p: %x\n", ip, ppc_inst_val(op)); + pr_err("Unexpected call sequence at %p: %s\n", ip, ppc_inst_as_str(op)); return -EINVAL; } @@ -733,7 +733,7 @@ __ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, /* Make sure that that this is still a 24bit jump */ if (!is_bl_op(op)) { - pr_err("Not expected bl: opcode is %x\n", ppc_inst_val(op)); + pr_err("Not expected bl: opcode is %s\n", ppc_inst_as_str(op)); return -EINVAL; } diff --git a/arch/powerpc/lib/test_emulate_step.c b/arch/powerpc/lib/test_emulate_step.c index c9a1a343123d..e25e92750416 100644 --- a/arch/powerpc/lib/test_emulate_step.c +++ b/arch/powerpc/lib/test_emulate_step.c @@ -1147,7 +1147,7 @@ static int __init emulate_compute_instr(struct pt_regs *regs, if (analyse_instr(&op, regs, instr) != 1 || GETTYPE(op.type) != COMPUTE) { - pr_info("emulation failed, instruction = 0x%08x\n", ppc_inst_val(instr)); + pr_info("execution failed, instruction = %s\n", ppc_inst_as_str(instr)); return -EFAULT; } @@ -1167,7 +1167,7 @@ static int __init execute_compute_instr(struct pt_regs *regs, /* Patch the NOP with the actual instruction */ patch_instruction_site(&patch__exec_instr, instr); if (exec_instr(regs)) { - pr_info("execution failed, instruction = 0x%08x\n", ppc_inst_val(instr)); + pr_info("execution failed, instruction = %s\n", ppc_inst_as_str(instr)); return -EFAULT; } diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index f08b2ef1995a..8df83a744528 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -2977,7 +2977,7 @@ generic_inst_dump(unsigned long adr, long count, int praddr, dotted = 0; last_inst = inst; if (praddr) - printf(REG" %.8x", adr, ppc_inst_val(inst)); + printf(REG" %s", adr, ppc_inst_as_str(inst)); printf("\t"); dump_func(ppc_inst_val(inst), adr); printf("\n"); |