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m68knommu: implement minimal regset support

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Add code support to the m68k architecture for regsets.

Currently the only thing that will need to use regsets for m68k will be
coredump support of the elf_fdpic loader. So the changes are conditional
on that. The added support is the minimum definitions required to support
just that.

Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
This commit is contained in:
Greg Ungerer 2022-04-27 23:09:37 +10:00
parent 6ed2db985a
commit bd53e442e8
1 changed files with 58 additions and 0 deletions
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58
arch/m68k/kernel/ptrace.c
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@ -19,6 +19,8 @@
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/signal.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/uaccess.h>
#include <asm/page.h>
@ -291,3 +293,59 @@ asmlinkage void syscall_trace_leave(void)
ptrace_report_syscall_exit(task_pt_regs(current), 0);
}
#endif /* CONFIG_COLDFIRE */
#if defined(CONFIG_BINFMT_ELF_FDPIC) && defined(CONFIG_ELF_CORE)
/*
* Currently the only thing that needs to use regsets for m68k is the
* coredump support of the elf_fdpic loader. Implement the minimum
* definitions required for that.
*/
static int m68k_regset_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
struct pt_regs *ptregs = task_pt_regs(target);
u32 uregs[ELF_NGREG];
ELF_CORE_COPY_REGS(uregs, ptregs);
return membuf_write(&to, uregs, sizeof(uregs));
}
enum m68k_regset {
REGSET_GPR,
#ifdef CONFIG_FPU
REGSET_FPU,
#endif
};
static const struct user_regset m68k_user_regsets[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(u32),
.align = sizeof(u16),
.regset_get = m68k_regset_get,
},
#ifdef CONFIG_FPU
[REGSET_FPU] = {
.core_note_type = NT_PRFPREG,
.n = sizeof(struct user_m68kfp_struct) / sizeof(u32),
.size = sizeof(u32),
.align = sizeof(u32),
}
#endif /* CONFIG_FPU */
};
static const struct user_regset_view user_m68k_view = {
.name = "m68k",
.e_machine = EM_68K,
.ei_osabi = ELF_OSABI,
.regsets = m68k_user_regsets,
.n = ARRAY_SIZE(m68k_user_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_m68k_view;
}
#endif /* CONFIG_BINFMT_ELF_FDPIC && CONFIG_ELF_CORE */