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powerpc: Use a datatype for instructions

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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

9
arch/powerpc/lib/test_emulate_step.c
View file

@ -462,7 +462,7 @@ struct compute_test {
struct {
char *descr;
unsigned long flags;
unsigned int instr;
struct ppc_inst instr;
struct pt_regs regs;
} subtests[MAX_SUBTESTS + 1];
};
@ -843,7 +843,7 @@ static struct compute_test compute_tests[] = {
};
static int __init emulate_compute_instr(struct pt_regs *regs,
unsigned int instr)
struct ppc_inst instr)
{
struct instruction_op op;
@ -861,7 +861,7 @@ static int __init emulate_compute_instr(struct pt_regs *regs,
}
static int __init execute_compute_instr(struct pt_regs *regs,
unsigned int instr)
struct ppc_inst instr)
{
extern int exec_instr(struct pt_regs *regs);
extern s32 patch__exec_instr;
@ -892,7 +892,8 @@ static void __init run_tests_compute(void)
unsigned long flags;
struct compute_test *test;
struct pt_regs *regs, exp, got;
unsigned int i, j, k, instr;
unsigned int i, j, k;
struct ppc_inst instr;
bool ignore_gpr, ignore_xer, ignore_ccr, passed;
for (i = 0; i < ARRAY_SIZE(compute_tests); i++) {