diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/300-MIPS-Exclude-more-dsemul-code-when-CONFIG_MIPS_FP_SU.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/300-MIPS-Exclude-more-dsemul-code-when-CONFIG_MIPS_FP_SU.patch | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/300-MIPS-Exclude-more-dsemul-code-when-CONFIG_MIPS_FP_SU.patch b/target/linux/generic/backport-5.4/300-MIPS-Exclude-more-dsemul-code-when-CONFIG_MIPS_FP_SU.patch new file mode 100644 index 0000000000..1be051e1df --- /dev/null +++ b/target/linux/generic/backport-5.4/300-MIPS-Exclude-more-dsemul-code-when-CONFIG_MIPS_FP_SU.patch @@ -0,0 +1,140 @@ +From d96c3157f9ca177727fbad960fcf6f52f145f471 Mon Sep 17 00:00:00 2001 +From: Yousong Zhou <yszhou4tech@gmail.com> +Date: Thu, 9 Jan 2020 11:33:19 +0800 +Subject: [PATCH] MIPS: Exclude more dsemul code when CONFIG_MIPS_FP_SUPPORT=n + +This furthers what commit 42b10815d559 ("MIPS: Don't compile math-emu +when CONFIG_MIPS_FP_SUPPORT=n") has done + +Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com> +--- + arch/mips/include/asm/processor.h | 12 ++++++------ + arch/mips/kernel/process.c | 10 ++++++++-- + arch/mips/kernel/vdso.c | 26 +++++++++++++++----------- + 3 files changed, 29 insertions(+), 19 deletions(-) + +diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h +index 7619ad319400..813ba94d87bb 100644 +--- a/arch/mips/include/asm/processor.h ++++ b/arch/mips/include/asm/processor.h +@@ -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 \ + */ \ +diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c +index 339870ed92f7..b2a797557825 100644 +--- a/arch/mips/kernel/process.c ++++ b/arch/mips/kernel/process.c +@@ -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(¤t->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); +diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c +index bc35f8499111..3adb7354bc01 100644 +--- a/arch/mips/kernel/vdso.c ++++ b/arch/mips/kernel/vdso.c +@@ -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; ++ } + } + + /* |