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author | Stafford Horne <shorne@gmail.com> | 2023-04-14 09:31:08 +0200 |
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committer | Stafford Horne <shorne@gmail.com> | 2023-04-26 16:08:06 +0200 |
commit | c91b4a07655d5ba67962a08dfac8bd7f45ad049c (patch) | |
tree | f13741ef3940afa11253805042fe71b961a0f721 | |
parent | openrisc: Support floating point user api (diff) | |
download | linux-c91b4a07655d5ba67962a08dfac8bd7f45ad049c.tar.xz linux-c91b4a07655d5ba67962a08dfac8bd7f45ad049c.zip |
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>
-rw-r--r-- | arch/openrisc/kernel/ptrace.c | 37 |
1 files changed, 37 insertions, 0 deletions
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 @@ -85,10 +85,39 @@ static int genregs_set(struct task_struct *target, } /* + * 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 = { |