xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc: Use a datatype for instructions

Browse Source 
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
This commit is contained in:
Jordan Niethe
2020-05-06 13:40:31 +10:00
committed by Michael Ellerman
parent 217862d9b9
commit 94afd069d9
26 changed files with 237 additions and 214 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/lib/sstep.c
View File

@@ -1163,7 +1163,7 @@ static nokprobe_inline int trap_compare(long v1, long v2)
* otherwise.
*/
int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
unsigned int instr)
struct ppc_inst instr)
{
unsigned int opcode, ra, rb, rc, rd, spr, u;
unsigned long int imm;
@@ -3103,7 +3103,7 @@ NOKPROBE_SYMBOL(emulate_loadstore);
* or -1 if the instruction is one that should not be stepped,
* such as an rfid, or a mtmsrd that would clear MSR_RI.
*/
int emulate_step(struct pt_regs *regs, unsigned int instr)
int emulate_step(struct pt_regs *regs, struct ppc_inst instr)
{
struct instruction_op op;
int r, err, type;