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MIPS: Add FP_MODE regset support
Define an NT_MIPS_FP_MODE core file note and implement a corresponding regset holding the state handled by PR_SET_FP_MODE and PR_GET_FP_MODE prctl(2) requests. This lets debug software correctly interpret the contents of floating-point general registers both in live debugging and in core files, and also switch floating-point modes of a live process. [paul.burton@mips.com: - Changed NT_MIPS_FP_MODE to 0x801 to match first nibble of NT_MIPS_DSP, which was also changed to avoid a conflict.] Signed-off-by: Maciej W. Rozycki <macro@mips.com> Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/19331/ Cc: James Hogan <jhogan@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org
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2 changed files with 64 additions and 0 deletions
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@ -759,10 +759,57 @@ static int dsp_active(struct task_struct *target,
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return cpu_has_dsp ? NUM_DSP_REGS + 1 : -ENODEV;
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}
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/* Copy the FP mode setting to the supplied NT_MIPS_FP_MODE buffer. */
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static int fp_mode_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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int fp_mode;
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fp_mode = mips_get_process_fp_mode(target);
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
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sizeof(fp_mode));
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}
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/*
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* Copy the supplied NT_MIPS_FP_MODE buffer to the FP mode setting.
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*
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* We optimize for the case where `count % sizeof(int) == 0', which
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* is supposed to have been guaranteed by the kernel before calling
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* us, e.g. in `ptrace_regset'. We enforce that requirement, so
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* that we can safely avoid preinitializing temporaries for partial
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* mode writes.
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*/
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static int fp_mode_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int fp_mode;
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int err;
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BUG_ON(count % sizeof(int));
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if (pos + count > sizeof(fp_mode))
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return -EIO;
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err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
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sizeof(fp_mode));
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if (err)
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return err;
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if (count > 0)
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err = mips_set_process_fp_mode(target, fp_mode);
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return err;
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}
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enum mips_regset {
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REGSET_GPR,
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REGSET_FPR,
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REGSET_DSP,
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REGSET_FP_MODE,
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};
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struct pt_regs_offset {
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@ -877,6 +924,14 @@ static const struct user_regset mips_regsets[] = {
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.set = dsp32_set,
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.active = dsp_active,
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},
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[REGSET_FP_MODE] = {
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.core_note_type = NT_MIPS_FP_MODE,
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.n = 1,
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.size = sizeof(int),
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.align = sizeof(int),
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.get = fp_mode_get,
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.set = fp_mode_set,
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},
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};
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static const struct user_regset_view user_mips_view = {
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@ -917,6 +972,14 @@ static const struct user_regset mips64_regsets[] = {
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.set = dsp64_set,
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.active = dsp_active,
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},
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[REGSET_FP_MODE] = {
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.core_note_type = NT_MIPS_FP_MODE,
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.n = 1,
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.size = sizeof(int),
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.align = sizeof(int),
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.get = fp_mode_get,
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.set = fp_mode_set,
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},
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};
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static const struct user_regset_view user_mips64_view = {
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@ -423,6 +423,7 @@ typedef struct elf64_shdr {
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#define NT_ARC_V2 0x600 /* ARCv2 accumulator/extra registers */
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#define NT_VMCOREDD 0x700 /* Vmcore Device Dump Note */
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#define NT_MIPS_DSP 0x800 /* MIPS DSP ASE registers */
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#define NT_MIPS_FP_MODE 0x801 /* MIPS floating-point mode */
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/* Note header in a PT_NOTE section */
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typedef struct elf32_note {
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