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openrisc: Add floating point regset 

Define REGSET_FPU to allow reading and writing the FPCSR fpu state
register.  This will be used primarily by debuggers like GDB.

Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Stafford Horne 2023-04-14 08:31:08 +01:00
parent 27267655c5
commit c91b4a0765
1 changed files with 37 additions and 0 deletions
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37
arch/openrisc/kernel/ptrace.c
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@ -84,11 +84,40 @@ static int genregs_set(struct task_struct *target,
return ret;
}
/*
* As OpenRISC shares GPRs and floating point registers we don't need to export
* the floating point registers again. So here we only export the fpcsr special
* purpose register.
*/
static int fpregs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
const struct pt_regs *regs = task_pt_regs(target);
return membuf_store(&to, regs->fpcsr);
}
static int fpregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = task_pt_regs(target);
int ret;
/* FPCSR */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->fpcsr, 0, 4);
return ret;
}
/*
* Define the register sets available on OpenRISC under Linux
*/
enum or1k_regset {
REGSET_GENERAL,
REGSET_FPU,
};
static const struct user_regset or1k_regsets[] = {
@ -100,6 +129,14 @@ static const struct user_regset or1k_regsets[] = {
.regset_get = genregs_get,
.set = genregs_set,
},
[REGSET_FPU] = {
.core_note_type = NT_PRFPREG,
.n = sizeof(struct __or1k_fpu_state) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long),
.regset_get = fpregs_get,
.set = fpregs_set,
},
};
static const struct user_regset_view user_or1k_native_view = {