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MIPS: ptrace: Remove FP support when CONFIG_MIPS_FP_SUPPORT=n

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When CONFIG_MIPS_FP_SUPPORT=n we don't support floating point, so remove
the related ptrace support. Besides removing code which should not be
needed, this prepares us for the removal of FPU state in struct
task_struct which this code requires.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/21008/
Cc: linux-mips@linux-mips.org
This commit is contained in:
Paul Burton
2018-11-07 23:14:07 +00:00
parent 85164fd8b0
commit 6c79759eca
2 changed files with 179 additions and 154 deletions
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33
arch/mips/kernel/ptrace32.c
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@@ -82,7 +82,6 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
/* Read the word at location addr in the USER area. */
case PTRACE_PEEKUSR: {
struct pt_regs *regs;
union fpureg *fregs;
unsigned int tmp;
regs = task_pt_regs(child);
@@ -92,7 +91,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
case 0 ... 31:
tmp = regs->regs[addr];
break;
case FPR_BASE ... FPR_BASE + 31:
#ifdef CONFIG_MIPS_FP_SUPPORT
case FPR_BASE ... FPR_BASE + 31: {
union fpureg *fregs;
if (!tsk_used_math(child)) {
/* FP not yet used */
tmp = -1;
@@ -111,6 +113,15 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
}
tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
break;
}
case FPC_CSR:
tmp = child->thread.fpu.fcr31;
break;
case FPC_EIR:
/* implementation / version register */
tmp = boot_cpu_data.fpu_id;
break;
#endif /* CONFIG_MIPS_FP_SUPPORT */
case PC:
tmp = regs->cp0_epc;
break;
@@ -126,13 +137,6 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
case MMLO:
tmp = regs->lo;
break;
case FPC_CSR:
tmp = child->thread.fpu.fcr31;
break;
case FPC_EIR:
/* implementation / version register */
tmp = boot_cpu_data.fpu_id;
break;
case DSP_BASE ... DSP_BASE + 5: {
dspreg_t *dregs;
@@ -203,6 +207,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
mips_syscall_is_indirect(child, regs))
mips_syscall_update_nr(child, regs);
break;
#ifdef CONFIG_MIPS_FP_SUPPORT
case FPR_BASE ... FPR_BASE + 31: {
union fpureg *fregs = get_fpu_regs(child);
@@ -225,6 +230,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
set_fpr64(&fregs[addr - FPR_BASE], 0, data);
break;
}
case FPC_CSR:
child->thread.fpu.fcr31 = data;
break;
#endif /* CONFIG_MIPS_FP_SUPPORT */
case PC:
regs->cp0_epc = data;
break;
@@ -234,9 +243,6 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
case MMLO:
regs->lo = data;
break;
case FPC_CSR:
child->thread.fpu.fcr31 = data;
break;
case DSP_BASE ... DSP_BASE + 5: {
dspreg_t *dregs;
@@ -274,6 +280,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
(struct user_pt_regs __user *) (__u64) data);
break;
#ifdef CONFIG_MIPS_FP_SUPPORT
case PTRACE_GETFPREGS:
ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data);
break;
@@ -281,7 +288,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
case PTRACE_SETFPREGS:
ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data);
break;
#endif
case PTRACE_GET_THREAD_AREA:
ret = put_user(task_thread_info(child)->tp_value,
(unsigned int __user *) (unsigned long) data);