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    Subject[RFC PATCH 3/4] objtool/powerpc: Enable objtool to be built on ppc
    Date
    This patch adds [stub] implementations for required
    functions, inorder to enable objtool build on powerpc.

    Signed-off-by: Sathvika Vasireddy <sv@linux.ibm.com>
    ---
    arch/powerpc/Kconfig | 1 +
    tools/objtool/arch/powerpc/Build | 2 +
    tools/objtool/arch/powerpc/decode.c | 73 +++++++++++++++++++
    .../arch/powerpc/include/arch/cfi_regs.h | 11 +++
    tools/objtool/arch/powerpc/include/arch/elf.h | 8 ++
    .../arch/powerpc/include/arch/endianness.h | 9 +++
    .../arch/powerpc/include/arch/special.h | 21 ++++++
    tools/objtool/arch/powerpc/special.c | 19 +++++
    8 files changed, 144 insertions(+)
    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/endianness.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 174edabb74fa..732a3f91ee5e 100644
    --- a/arch/powerpc/Kconfig
    +++ b/arch/powerpc/Kconfig
    @@ -232,6 +232,7 @@ config PPC
    select HAVE_MOD_ARCH_SPECIFIC
    select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
    select HAVE_OPTPROBES
    + select HAVE_OBJTOOL if PPC64
    select HAVE_PERF_EVENTS
    select HAVE_PERF_EVENTS_NMI if PPC64
    select HAVE_PERF_REGS
    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..e3b77a6ce357
    --- /dev/null
    +++ b/tools/objtool/arch/powerpc/decode.c
    @@ -0,0 +1,73 @@
    +// 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>
    +
    +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)
    +{
    + return 0;
    +}
    +
    +const char *arch_nop_insn(int len)
    +{
    + return NULL;
    +}
    +
    +const char *arch_ret_insn(int len)
    +{
    + return NULL;
    +}
    +
    +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;
    + memcpy(&insn, sec->data->d_buf+offset, 4);
    + *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/endianness.h b/tools/objtool/arch/powerpc/include/arch/endianness.h
    new file mode 100644
    index 000000000000..7c362527da20
    --- /dev/null
    +++ b/tools/objtool/arch/powerpc/include/arch/endianness.h
    @@ -0,0 +1,9 @@
    +/* SPDX-License-Identifier: GPL-2.0-or-later */
    +#ifndef _ARCH_ENDIANNESS_H
    +#define _ARCH_ENDIANNESS_H
    +
    +#include <endian.h>
    +
    +#define __TARGET_BYTE_ORDER __LITTLE_ENDIAN
    +
    +#endif /* _ARCH_ENDIANNESS_H */
    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..e3e75cbab858
    --- /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 <objtool/special.h>
    +#include <objtool/builtin.h>
    +
    +
    +bool arch_support_alt_relocation(struct special_alt *special_alt,
    + struct instruction *insn,
    + struct reloc *reloc)
    +{
    + return false;
    +}
    +
    +struct reloc *arch_find_switch_table(struct objtool_file *file,
    + struct instruction *insn)
    +{
    + return NULL;
    +}
    --
    2.25.1
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