[PATCH v2 15/16] objtool/powerpc: Enable objtool to be built on ppc
Randy Dunlap
rdunlap at infradead.org
Sat Feb 4 19:21:42 AEDT 2023
On 2/4/23 00:19, Randy Dunlap wrote:
> Hi--
>
> On 8/29/22 23:41, Christophe Leroy wrote:
>>
>>
>> Le 29/08/2022 à 07:52, Sathvika Vasireddy a écrit :
>>> This patch adds [stub] implementations for required
>>> functions, inorder to enable objtool build on powerpc.
>>
>> Not all powerpc it seems, see below
>>
>
> When cross-compiling PPC32 (on x86_64), I get 3600+ of these:
>
> /bin/sh: line 1: ./tools/objtool/objtool: No such file or directory
> /bin/sh: line 1: ./tools/objtool/objtool: No such file or directory
> /bin/sh: line 1: ./tools/objtool/objtool: No such file or directory
>
> Is there some way that objtool should work when cross-compiling?
>
Oops. Its build failed. I seem to be missing header file(s)
and possibly a library.
I'll check on those...
Cheers.
>
>>>
>>> Signed-off-by: Sathvika Vasireddy <sv at linux.ibm.com>
>>> [Christophe Leroy: powerpc: Add missing asm/asm.h for objtool]
>>> Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>
>>> ---
>>> arch/powerpc/Kconfig | 1 +
>>> arch/powerpc/include/asm/asm.h | 7 ++
>>> tools/objtool/arch/powerpc/Build | 2 +
>>> tools/objtool/arch/powerpc/decode.c | 74 +++++++++++++++++++
>>> .../arch/powerpc/include/arch/cfi_regs.h | 11 +++
>>> tools/objtool/arch/powerpc/include/arch/elf.h | 8 ++
>>> .../arch/powerpc/include/arch/special.h | 21 ++++++
>>> tools/objtool/arch/powerpc/special.c | 19 +++++
>>> 8 files changed, 143 insertions(+)
>>> create mode 100644 arch/powerpc/include/asm/asm.h
>>> create mode 100644 tools/objtool/arch/powerpc/Build
>>> create mode 100644 tools/objtool/arch/powerpc/decode.c
>>> create mode 100644 tools/objtool/arch/powerpc/include/arch/cfi_regs.h
>>> create mode 100644 tools/objtool/arch/powerpc/include/arch/elf.h
>>> create mode 100644 tools/objtool/arch/powerpc/include/arch/special.h
>>> create mode 100644 tools/objtool/arch/powerpc/special.c
>>>
>>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>>> index 4c466acdc70d..dc05cd23c233 100644
>>> --- a/arch/powerpc/Kconfig
>>> +++ b/arch/powerpc/Kconfig
>>> @@ -237,6 +237,7 @@ config PPC
>>> select HAVE_MOD_ARCH_SPECIFIC
>>> select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
>>> select HAVE_OPTPROBES
>>> + select HAVE_OBJTOOL if PPC32 || MPROFILE_KERNEL
>>
>> Why restrict it to MPROFILE_KERNEL ? In your RFC it was for all PPC64.
>>
>> Recent discussion on the list shows new problem with recordmcount, see
>> https://lore.kernel.org/all/MW5PR84MB184250EA1CAE04497C1E7CE9AB769@MW5PR84MB1842.NAMPRD84.PROD.OUTLOOK.COM/
>>
>> Those ones are with ppc64 big endian, so objtool would be welcome here
>> as well.
>>
>>> select HAVE_PERF_EVENTS
>>> select HAVE_PERF_EVENTS_NMI if PPC64
>>> select HAVE_PERF_REGS
>>> diff --git a/arch/powerpc/include/asm/asm.h b/arch/powerpc/include/asm/asm.h
>>> new file mode 100644
>>> index 000000000000..86f46b604e9a
>>> --- /dev/null
>>> +++ b/arch/powerpc/include/asm/asm.h
>>> @@ -0,0 +1,7 @@
>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>> +#ifndef _ASM_POWERPC_ASM_H
>>> +#define _ASM_POWERPC_ASM_H
>>> +
>>> +#define _ASM_PTR " .long "
>>> +
>>> +#endif /* _ASM_POWERPC_ASM_H */
>>> diff --git a/tools/objtool/arch/powerpc/Build b/tools/objtool/arch/powerpc/Build
>>> new file mode 100644
>>> index 000000000000..d24d5636a5b8
>>> --- /dev/null
>>> +++ b/tools/objtool/arch/powerpc/Build
>>> @@ -0,0 +1,2 @@
>>> +objtool-y += decode.o
>>> +objtool-y += special.o
>>> diff --git a/tools/objtool/arch/powerpc/decode.c b/tools/objtool/arch/powerpc/decode.c
>>> new file mode 100644
>>> index 000000000000..8b6a14680da7
>>> --- /dev/null
>>> +++ b/tools/objtool/arch/powerpc/decode.c
>>> @@ -0,0 +1,74 @@
>>> +// SPDX-License-Identifier: GPL-2.0-or-later
>>> +
>>> +#include <stdio.h>
>>> +#include <stdlib.h>
>>> +#include <objtool/check.h>
>>> +#include <objtool/elf.h>
>>> +#include <objtool/arch.h>
>>> +#include <objtool/warn.h>
>>> +#include <objtool/builtin.h>
>>> +#include <objtool/endianness.h>
>>> +
>>> +unsigned long arch_dest_reloc_offset(int addend)
>>> +{
>>> + return addend;
>>> +}
>>> +
>>> +bool arch_callee_saved_reg(unsigned char reg)
>>> +{
>>> + return false;
>>> +}
>>> +
>>> +int arch_decode_hint_reg(u8 sp_reg, int *base)
>>> +{
>>> + exit(-1);
>>> +}
>>> +
>>> +const char *arch_nop_insn(int len)
>>> +{
>>> + exit(-1);
>>> +}
>>> +
>>> +const char *arch_ret_insn(int len)
>>> +{
>>> + exit(-1);
>>> +}
>>> +
>>> +int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
>>> + unsigned long offset, unsigned int maxlen,
>>> + unsigned int *len, enum insn_type *type,
>>> + unsigned long *immediate,
>>> + struct list_head *ops_list)
>>> +{
>>> + u32 insn;
>>> +
>>> + *immediate = 0;
>>> + insn = bswap_if_needed(file->elf, *(u32 *)(sec->data->d_buf + offset));
>>> + *len = 4;
>>> + *type = INSN_OTHER;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +unsigned long arch_jump_destination(struct instruction *insn)
>>> +{
>>> + return insn->offset + insn->immediate;
>>> +}
>>> +
>>> +void arch_initial_func_cfi_state(struct cfi_init_state *state)
>>> +{
>>> + int i;
>>> +
>>> + for (i = 0; i < CFI_NUM_REGS; i++) {
>>> + state->regs[i].base = CFI_UNDEFINED;
>>> + state->regs[i].offset = 0;
>>> + }
>>> +
>>> + /* initial CFA (call frame address) */
>>> + state->cfa.base = CFI_SP;
>>> + state->cfa.offset = 0;
>>> +
>>> + /* initial LR (return address) */
>>> + state->regs[CFI_RA].base = CFI_CFA;
>>> + state->regs[CFI_RA].offset = 0;
>>> +}
>>> diff --git a/tools/objtool/arch/powerpc/include/arch/cfi_regs.h b/tools/objtool/arch/powerpc/include/arch/cfi_regs.h
>>> new file mode 100644
>>> index 000000000000..59638ebeafc8
>>> --- /dev/null
>>> +++ b/tools/objtool/arch/powerpc/include/arch/cfi_regs.h
>>> @@ -0,0 +1,11 @@
>>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>>> +
>>> +#ifndef _OBJTOOL_CFI_REGS_H
>>> +#define _OBJTOOL_CFI_REGS_H
>>> +
>>> +#define CFI_BP 1
>>> +#define CFI_SP CFI_BP
>>> +#define CFI_RA 32
>>> +#define CFI_NUM_REGS 33
>>> +
>>> +#endif
>>> diff --git a/tools/objtool/arch/powerpc/include/arch/elf.h b/tools/objtool/arch/powerpc/include/arch/elf.h
>>> new file mode 100644
>>> index 000000000000..3c8ebb7d2a6b
>>> --- /dev/null
>>> +++ b/tools/objtool/arch/powerpc/include/arch/elf.h
>>> @@ -0,0 +1,8 @@
>>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>>> +
>>> +#ifndef _OBJTOOL_ARCH_ELF
>>> +#define _OBJTOOL_ARCH_ELF
>>> +
>>> +#define R_NONE R_PPC_NONE
>>> +
>>> +#endif /* _OBJTOOL_ARCH_ELF */
>>> diff --git a/tools/objtool/arch/powerpc/include/arch/special.h b/tools/objtool/arch/powerpc/include/arch/special.h
>>> new file mode 100644
>>> index 000000000000..ffef9ada7133
>>> --- /dev/null
>>> +++ b/tools/objtool/arch/powerpc/include/arch/special.h
>>> @@ -0,0 +1,21 @@
>>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>>> +#ifndef _PPC_ARCH_SPECIAL_H
>>> +#define _PPC_ARCH_SPECIAL_H
>>> +
>>> +#define EX_ENTRY_SIZE 8
>>> +#define EX_ORIG_OFFSET 0
>>> +#define EX_NEW_OFFSET 4
>>> +
>>> +#define JUMP_ENTRY_SIZE 16
>>> +#define JUMP_ORIG_OFFSET 0
>>> +#define JUMP_NEW_OFFSET 4
>>> +#define JUMP_KEY_OFFSET 8
>>> +
>>> +#define ALT_ENTRY_SIZE 12
>>> +#define ALT_ORIG_OFFSET 0
>>> +#define ALT_NEW_OFFSET 4
>>> +#define ALT_FEATURE_OFFSET 8
>>> +#define ALT_ORIG_LEN_OFFSET 10
>>> +#define ALT_NEW_LEN_OFFSET 11
>>> +
>>> +#endif /* _PPC_ARCH_SPECIAL_H */
>>> diff --git a/tools/objtool/arch/powerpc/special.c b/tools/objtool/arch/powerpc/special.c
>>> new file mode 100644
>>> index 000000000000..d33868147196
>>> --- /dev/null
>>> +++ b/tools/objtool/arch/powerpc/special.c
>>> @@ -0,0 +1,19 @@
>>> +// SPDX-License-Identifier: GPL-2.0-or-later
>>> +#include <string.h>
>>> +#include <stdlib.h>
>>> +#include <objtool/special.h>
>>> +#include <objtool/builtin.h>
>>> +
>>> +
>>> +bool arch_support_alt_relocation(struct special_alt *special_alt,
>>> + struct instruction *insn,
>>> + struct reloc *reloc)
>>> +{
>>> + exit(-1);
>>> +}
>>> +
>>> +struct reloc *arch_find_switch_table(struct objtool_file *file,
>>> + struct instruction *insn)
>>> +{
>>> + exit(-1);
>>> +}
>
--
~Randy
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