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MIPS: Exclude more dsemul code when CONFIG_MIPS_FP_SUPPORT=n 

This furthers what commit 42b10815d5 ("MIPS: Don't compile math-emu
when CONFIG_MIPS_FP_SUPPORT=n") has done

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Yousong Zhou 2020-03-24 23:27:51 +08:00 committed by Thomas Bogendoerfer
parent d191aaffe3
commit aebdc6ff3b
3 changed files with 29 additions and 19 deletions
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12
arch/mips/include/asm/processor.h
View File

@ -253,13 +253,13 @@ struct thread_struct {
#ifdef CONFIG_MIPS_FP_SUPPORT
/* Saved fpu/fpu emulator stuff. */
struct mips_fpu_struct fpu FPU_ALIGN;
#endif
/* Assigned branch delay slot 'emulation' frame */
atomic_t bd_emu_frame;
/* PC of the branch from a branch delay slot 'emulation' */
unsigned long bd_emu_branch_pc;
/* PC to continue from following a branch delay slot 'emulation' */
unsigned long bd_emu_cont_pc;
#endif
#ifdef CONFIG_MIPS_MT_FPAFF
/* Emulated instruction count */
unsigned long emulated_fp;
@ -302,7 +302,11 @@ struct thread_struct {
.fpr = {{{0,},},}, \
.fcr31 = 0, \
.msacsr = 0, \
},
}, \
/* Delay slot emulation */ \
.bd_emu_frame = ATOMIC_INIT(BD_EMUFRAME_NONE), \
.bd_emu_branch_pc = 0, \
.bd_emu_cont_pc = 0,
#else
# define FPU_INIT
#endif
@ -334,10 +338,6 @@ struct thread_struct {
* FPU affinity state (null if not FPAFF) \
*/ \
FPAFF_INIT \
/* Delay slot emulation */ \
.bd_emu_frame = ATOMIC_INIT(BD_EMUFRAME_NONE), \
.bd_emu_branch_pc = 0, \
.bd_emu_cont_pc = 0, \
/* \
* Saved DSP stuff \
*/ \

10
arch/mips/kernel/process.c
View File

@ -75,7 +75,9 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
lose_fpu(0);
clear_thread_flag(TIF_MSA_CTX_LIVE);
clear_used_math();
#ifdef CONFIG_MIPS_FP_SUPPORT
atomic_set(&current->thread.bd_emu_frame, BD_EMUFRAME_NONE);
#endif
init_dsp();
regs->cp0_epc = pc;
regs->regs[29] = sp;
@ -176,7 +178,9 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
clear_tsk_thread_flag(p, TIF_FPUBOUND);
#endif /* CONFIG_MIPS_MT_FPAFF */
#ifdef CONFIG_MIPS_FP_SUPPORT
atomic_set(&p->thread.bd_emu_frame, BD_EMUFRAME_NONE);
#endif
if (clone_flags & CLONE_SETTLS)
ti->tp_value = tls;
@ -650,8 +654,10 @@ unsigned long mips_stack_top(void)
{
unsigned long top = TASK_SIZE & PAGE_MASK;
/* One page for branch delay slot "emulation" */
top -= PAGE_SIZE;
if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) {
/* One page for branch delay slot "emulation" */
top -= PAGE_SIZE;
}
/* Space for the VDSO, data page & GIC user page */
top -= PAGE_ALIGN(current->thread.abi->vdso->size);

26
arch/mips/kernel/vdso.c
View File

@ -71,10 +71,12 @@ subsys_initcall(init_vdso);
static unsigned long vdso_base(void)
{
unsigned long base;
unsigned long base = STACK_TOP;
/* Skip the delay slot emulation page */
base = STACK_TOP + PAGE_SIZE;
if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) {
/* Skip the delay slot emulation page */
base += PAGE_SIZE;
}
if (current->flags & PF_RANDOMIZE) {
base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1);
@ -95,14 +97,16 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
if (down_write_killable(&mm->mmap_sem))
return -EINTR;
/* Map delay slot emulation page */
base = mmap_region(NULL, STACK_TOP, PAGE_SIZE,
VM_READ | VM_EXEC |
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
0, NULL);
if (IS_ERR_VALUE(base)) {
ret = base;
goto out;
if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) {
/* Map delay slot emulation page */
base = mmap_region(NULL, STACK_TOP, PAGE_SIZE,
VM_READ | VM_EXEC |
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
0, NULL);
if (IS_ERR_VALUE(base)) {
ret = base;
goto out;
}
}
/*