diff options
| author |   Jordan Niethe <jniethe5@gmail.com> | 2020-05-06 13:40:31 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-05-19 00:10:37 +1000 |
| commit | 94afd069d937d84fb4f696eb9a78db4084e43d21 (patch) | |
| tree | 88f3f2fef60d56cd3b155762c378ac1fc05a5bd2 /arch/powerpc/kernel/kgdb.c | |
| parent | powerpc: Introduce functions for instruction equality (diff) | |
| download | linux-dev-94afd069d937d84fb4f696eb9a78db4084e43d21.tar.xz linux-dev-94afd069d937d84fb4f696eb9a78db4084e43d21.zip | |
powerpc: Use a datatype for instructions
Currently unsigned ints are used to represent instructions on powerpc.
This has worked well as instructions have always been 4 byte words.
However, ISA v3.1 introduces some changes to instructions that mean
this scheme will no longer work as well. This change is Prefixed
Instructions. A prefixed instruction is made up of a word prefix
followed by a word suffix to make an 8 byte double word instruction.
No matter the endianness of the system the prefix always comes first.
Prefixed instructions are only planned for powerpc64.
Introduce a ppc_inst type to represent both prefixed and word
instructions on powerpc64 while keeping it possible to exclusively
have word instructions on powerpc32.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
[mpe: Fix compile error in emulate_spe()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-12-jniethe5@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/kgdb.c')
| -rw-r--r-- | arch/powerpc/kernel/kgdb.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c index a6b38a19133f..652b2852bea3 100644 --- a/arch/powerpc/kernel/kgdb.c +++ b/arch/powerpc/kernel/kgdb.c @@ -419,7 +419,7 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) { int err; unsigned int instr; - unsigned int *addr = (unsigned int *)bpt->bpt_addr; + struct ppc_inst *addr = (struct ppc_inst *)bpt->bpt_addr; err = probe_kernel_address(addr, instr); if (err) @@ -438,7 +438,7 @@ int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) { int err; unsigned int instr = *(unsigned int *)bpt->saved_instr; - unsigned int *addr = (unsigned int *)bpt->bpt_addr; + struct ppc_inst *addr = (struct ppc_inst *)bpt->bpt_addr; err = patch_instruction(addr, ppc_inst(instr)); if (err) |