From c91b4a07655d5ba67962a08dfac8bd7f45ad049c Mon Sep 17 00:00:00 2001 From: Stafford Horne Date: Fri, 14 Apr 2023 08:31:08 +0100 Subject: 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 --- arch/openrisc/kernel/ptrace.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'arch/openrisc') diff --git a/arch/openrisc/kernel/ptrace.c b/arch/openrisc/kernel/ptrace.c index 85ace93fc251..0b7d2ca6ba3b 100644 --- a/arch/openrisc/kernel/ptrace.c +++ b/arch/openrisc/kernel/ptrace.c @@ -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, + ®s->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 = { -- cgit v1.2.3