v4.19.13 snapshot.
diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
new file mode 100644
index 0000000..4d36969
--- /dev/null
+++ b/arch/sparc/kernel/entry.S
@@ -0,0 +1,1372 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* arch/sparc/kernel/entry.S: Sparc trap low-level entry points.
+ *
+ * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
+ * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ * Copyright (C) 1996-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
+ */
+
+#include <linux/linkage.h>
+#include <linux/errno.h>
+
+#include <asm/head.h>
+#include <asm/asi.h>
+#include <asm/smp.h>
+#include <asm/contregs.h>
+#include <asm/ptrace.h>
+#include <asm/asm-offsets.h>
+#include <asm/psr.h>
+#include <asm/vaddrs.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/winmacro.h>
+#include <asm/signal.h>
+#include <asm/obio.h>
+#include <asm/mxcc.h>
+#include <asm/thread_info.h>
+#include <asm/param.h>
+#include <asm/unistd.h>
+
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+
+#define curptr g6
+
+/* These are just handy. */
+#define _SV save %sp, -STACKFRAME_SZ, %sp
+#define _RS restore
+
+#define FLUSH_ALL_KERNEL_WINDOWS \
+ _SV; _SV; _SV; _SV; _SV; _SV; _SV; \
+ _RS; _RS; _RS; _RS; _RS; _RS; _RS;
+
+ .text
+
+#ifdef CONFIG_KGDB
+ .align 4
+ .globl arch_kgdb_breakpoint
+ .type arch_kgdb_breakpoint,#function
+arch_kgdb_breakpoint:
+ ta 0x7d
+ retl
+ nop
+ .size arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
+#endif
+
+#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
+ .align 4
+ .globl floppy_hardint
+floppy_hardint:
+ /*
+ * This code cannot touch registers %l0 %l1 and %l2
+ * because SAVE_ALL depends on their values. It depends
+ * on %l3 also, but we regenerate it before a call.
+ * Other registers are:
+ * %l3 -- base address of fdc registers
+ * %l4 -- pdma_vaddr
+ * %l5 -- scratch for ld/st address
+ * %l6 -- pdma_size
+ * %l7 -- scratch [floppy byte, ld/st address, aux. data]
+ */
+
+ /* Do we have work to do? */
+ sethi %hi(doing_pdma), %l7
+ ld [%l7 + %lo(doing_pdma)], %l7
+ cmp %l7, 0
+ be floppy_dosoftint
+ nop
+
+ /* Load fdc register base */
+ sethi %hi(fdc_status), %l3
+ ld [%l3 + %lo(fdc_status)], %l3
+
+ /* Setup register addresses */
+ sethi %hi(pdma_vaddr), %l5 ! transfer buffer
+ ld [%l5 + %lo(pdma_vaddr)], %l4
+ sethi %hi(pdma_size), %l5 ! bytes to go
+ ld [%l5 + %lo(pdma_size)], %l6
+next_byte:
+ ldub [%l3], %l7
+
+ andcc %l7, 0x80, %g0 ! Does fifo still have data
+ bz floppy_fifo_emptied ! fifo has been emptied...
+ andcc %l7, 0x20, %g0 ! in non-dma mode still?
+ bz floppy_overrun ! nope, overrun
+ andcc %l7, 0x40, %g0 ! 0=write 1=read
+ bz floppy_write
+ sub %l6, 0x1, %l6
+
+ /* Ok, actually read this byte */
+ ldub [%l3 + 1], %l7
+ orcc %g0, %l6, %g0
+ stb %l7, [%l4]
+ bne next_byte
+ add %l4, 0x1, %l4
+
+ b floppy_tdone
+ nop
+
+floppy_write:
+ /* Ok, actually write this byte */
+ ldub [%l4], %l7
+ orcc %g0, %l6, %g0
+ stb %l7, [%l3 + 1]
+ bne next_byte
+ add %l4, 0x1, %l4
+
+ /* fall through... */
+floppy_tdone:
+ sethi %hi(pdma_vaddr), %l5
+ st %l4, [%l5 + %lo(pdma_vaddr)]
+ sethi %hi(pdma_size), %l5
+ st %l6, [%l5 + %lo(pdma_size)]
+ /* Flip terminal count pin */
+ set auxio_register, %l7
+ ld [%l7], %l7
+
+ ldub [%l7], %l5
+
+ or %l5, 0xc2, %l5
+ stb %l5, [%l7]
+ andn %l5, 0x02, %l5
+
+2:
+ /* Kill some time so the bits set */
+ WRITE_PAUSE
+ WRITE_PAUSE
+
+ stb %l5, [%l7]
+
+ /* Prevent recursion */
+ sethi %hi(doing_pdma), %l7
+ b floppy_dosoftint
+ st %g0, [%l7 + %lo(doing_pdma)]
+
+ /* We emptied the FIFO, but we haven't read everything
+ * as of yet. Store the current transfer address and
+ * bytes left to read so we can continue when the next
+ * fast IRQ comes in.
+ */
+floppy_fifo_emptied:
+ sethi %hi(pdma_vaddr), %l5
+ st %l4, [%l5 + %lo(pdma_vaddr)]
+ sethi %hi(pdma_size), %l7
+ st %l6, [%l7 + %lo(pdma_size)]
+
+ /* Restore condition codes */
+ wr %l0, 0x0, %psr
+ WRITE_PAUSE
+
+ jmp %l1
+ rett %l2
+
+floppy_overrun:
+ sethi %hi(pdma_vaddr), %l5
+ st %l4, [%l5 + %lo(pdma_vaddr)]
+ sethi %hi(pdma_size), %l5
+ st %l6, [%l5 + %lo(pdma_size)]
+ /* Prevent recursion */
+ sethi %hi(doing_pdma), %l7
+ st %g0, [%l7 + %lo(doing_pdma)]
+
+ /* fall through... */
+floppy_dosoftint:
+ rd %wim, %l3
+ SAVE_ALL
+
+ /* Set all IRQs off. */
+ or %l0, PSR_PIL, %l4
+ wr %l4, 0x0, %psr
+ WRITE_PAUSE
+ wr %l4, PSR_ET, %psr
+ WRITE_PAUSE
+
+ mov 11, %o0 ! floppy irq level (unused anyway)
+ mov %g0, %o1 ! devid is not used in fast interrupts
+ call sparc_floppy_irq
+ add %sp, STACKFRAME_SZ, %o2 ! struct pt_regs *regs
+
+ RESTORE_ALL
+
+#endif /* (CONFIG_BLK_DEV_FD) */
+
+ /* Bad trap handler */
+ .globl bad_trap_handler
+bad_trap_handler:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0 ! pt_regs
+ call do_hw_interrupt
+ mov %l7, %o1 ! trap number
+
+ RESTORE_ALL
+
+/* For now all IRQ's not registered get sent here. handler_irq() will
+ * see if a routine is registered to handle this interrupt and if not
+ * it will say so on the console.
+ */
+
+ .align 4
+ .globl real_irq_entry, patch_handler_irq
+real_irq_entry:
+ SAVE_ALL
+
+#ifdef CONFIG_SMP
+ .globl patchme_maybe_smp_msg
+
+ cmp %l7, 11
+patchme_maybe_smp_msg:
+ bgu maybe_smp4m_msg
+ nop
+#endif
+
+real_irq_continue:
+ or %l0, PSR_PIL, %g2
+ wr %g2, 0x0, %psr
+ WRITE_PAUSE
+ wr %g2, PSR_ET, %psr
+ WRITE_PAUSE
+ mov %l7, %o0 ! irq level
+patch_handler_irq:
+ call handler_irq
+ add %sp, STACKFRAME_SZ, %o1 ! pt_regs ptr
+ or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
+ wr %g2, PSR_ET, %psr ! keep ET up
+ WRITE_PAUSE
+
+ RESTORE_ALL
+
+#ifdef CONFIG_SMP
+ /* SMP per-cpu ticker interrupts are handled specially. */
+smp4m_ticker:
+ bne real_irq_continue+4
+ or %l0, PSR_PIL, %g2
+ wr %g2, 0x0, %psr
+ WRITE_PAUSE
+ wr %g2, PSR_ET, %psr
+ WRITE_PAUSE
+ call smp4m_percpu_timer_interrupt
+ add %sp, STACKFRAME_SZ, %o0
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+ RESTORE_ALL
+
+#define GET_PROCESSOR4M_ID(reg) \
+ rd %tbr, %reg; \
+ srl %reg, 12, %reg; \
+ and %reg, 3, %reg;
+
+ /* Here is where we check for possible SMP IPI passed to us
+ * on some level other than 15 which is the NMI and only used
+ * for cross calls. That has a separate entry point below.
+ *
+ * IPIs are sent on Level 12, 13 and 14. See IRQ_IPI_*.
+ */
+maybe_smp4m_msg:
+ GET_PROCESSOR4M_ID(o3)
+ sethi %hi(sun4m_irq_percpu), %l5
+ sll %o3, 2, %o3
+ or %l5, %lo(sun4m_irq_percpu), %o5
+ sethi %hi(0x70000000), %o2 ! Check all soft-IRQs
+ ld [%o5 + %o3], %o1
+ ld [%o1 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
+ andcc %o3, %o2, %g0
+ be,a smp4m_ticker
+ cmp %l7, 14
+ /* Soft-IRQ IPI */
+ st %o2, [%o1 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x70000000
+ WRITE_PAUSE
+ ld [%o1 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
+ WRITE_PAUSE
+ or %l0, PSR_PIL, %l4
+ wr %l4, 0x0, %psr
+ WRITE_PAUSE
+ wr %l4, PSR_ET, %psr
+ WRITE_PAUSE
+ srl %o3, 28, %o2 ! shift for simpler checks below
+maybe_smp4m_msg_check_single:
+ andcc %o2, 0x1, %g0
+ beq,a maybe_smp4m_msg_check_mask
+ andcc %o2, 0x2, %g0
+ call smp_call_function_single_interrupt
+ nop
+ andcc %o2, 0x2, %g0
+maybe_smp4m_msg_check_mask:
+ beq,a maybe_smp4m_msg_check_resched
+ andcc %o2, 0x4, %g0
+ call smp_call_function_interrupt
+ nop
+ andcc %o2, 0x4, %g0
+maybe_smp4m_msg_check_resched:
+ /* rescheduling is done in RESTORE_ALL regardless, but incr stats */
+ beq,a maybe_smp4m_msg_out
+ nop
+ call smp_resched_interrupt
+ nop
+maybe_smp4m_msg_out:
+ RESTORE_ALL
+
+ .align 4
+ .globl linux_trap_ipi15_sun4m
+linux_trap_ipi15_sun4m:
+ SAVE_ALL
+ sethi %hi(0x80000000), %o2
+ GET_PROCESSOR4M_ID(o0)
+ sethi %hi(sun4m_irq_percpu), %l5
+ or %l5, %lo(sun4m_irq_percpu), %o5
+ sll %o0, 2, %o0
+ ld [%o5 + %o0], %o5
+ ld [%o5 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
+ andcc %o3, %o2, %g0
+ be sun4m_nmi_error ! Must be an NMI async memory error
+ st %o2, [%o5 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x80000000
+ WRITE_PAUSE
+ ld [%o5 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
+ WRITE_PAUSE
+ or %l0, PSR_PIL, %l4
+ wr %l4, 0x0, %psr
+ WRITE_PAUSE
+ wr %l4, PSR_ET, %psr
+ WRITE_PAUSE
+ call smp4m_cross_call_irq
+ nop
+ b ret_trap_lockless_ipi
+ clr %l6
+
+ .globl smp4d_ticker
+ /* SMP per-cpu ticker interrupts are handled specially. */
+smp4d_ticker:
+ SAVE_ALL
+ or %l0, PSR_PIL, %g2
+ sethi %hi(CC_ICLR), %o0
+ sethi %hi(1 << 14), %o1
+ or %o0, %lo(CC_ICLR), %o0
+ stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 14 in MXCC's ICLR */
+ wr %g2, 0x0, %psr
+ WRITE_PAUSE
+ wr %g2, PSR_ET, %psr
+ WRITE_PAUSE
+ call smp4d_percpu_timer_interrupt
+ add %sp, STACKFRAME_SZ, %o0
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+ RESTORE_ALL
+
+ .align 4
+ .globl linux_trap_ipi15_sun4d
+linux_trap_ipi15_sun4d:
+ SAVE_ALL
+ sethi %hi(CC_BASE), %o4
+ sethi %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
+ or %o4, (CC_EREG - CC_BASE), %o0
+ ldda [%o0] ASI_M_MXCC, %o0
+ andcc %o0, %o2, %g0
+ bne 1f
+ sethi %hi(BB_STAT2), %o2
+ lduba [%o2] ASI_M_CTL, %o2
+ andcc %o2, BB_STAT2_MASK, %g0
+ bne 2f
+ or %o4, (CC_ICLR - CC_BASE), %o0
+ sethi %hi(1 << 15), %o1
+ stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 15 in MXCC's ICLR */
+ or %l0, PSR_PIL, %l4
+ wr %l4, 0x0, %psr
+ WRITE_PAUSE
+ wr %l4, PSR_ET, %psr
+ WRITE_PAUSE
+ call smp4d_cross_call_irq
+ nop
+ b ret_trap_lockless_ipi
+ clr %l6
+
+1: /* MXCC error */
+2: /* BB error */
+ /* Disable PIL 15 */
+ set CC_IMSK, %l4
+ lduha [%l4] ASI_M_MXCC, %l5
+ sethi %hi(1 << 15), %l7
+ or %l5, %l7, %l5
+ stha %l5, [%l4] ASI_M_MXCC
+ /* FIXME */
+1: b,a 1b
+
+ .globl smpleon_ipi
+ .extern leon_ipi_interrupt
+ /* SMP per-cpu IPI interrupts are handled specially. */
+smpleon_ipi:
+ SAVE_ALL
+ or %l0, PSR_PIL, %g2
+ wr %g2, 0x0, %psr
+ WRITE_PAUSE
+ wr %g2, PSR_ET, %psr
+ WRITE_PAUSE
+ call leonsmp_ipi_interrupt
+ add %sp, STACKFRAME_SZ, %o1 ! pt_regs
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+ RESTORE_ALL
+
+ .align 4
+ .globl linux_trap_ipi15_leon
+linux_trap_ipi15_leon:
+ SAVE_ALL
+ or %l0, PSR_PIL, %l4
+ wr %l4, 0x0, %psr
+ WRITE_PAUSE
+ wr %l4, PSR_ET, %psr
+ WRITE_PAUSE
+ call leon_cross_call_irq
+ nop
+ b ret_trap_lockless_ipi
+ clr %l6
+
+#endif /* CONFIG_SMP */
+
+ /* This routine handles illegal instructions and privileged
+ * instruction attempts from user code.
+ */
+ .align 4
+ .globl bad_instruction
+bad_instruction:
+ sethi %hi(0xc1f80000), %l4
+ ld [%l1], %l5
+ sethi %hi(0x81d80000), %l7
+ and %l5, %l4, %l5
+ cmp %l5, %l7
+ be 1f
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call do_illegal_instruction
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+1: /* unimplemented flush - just skip */
+ jmpl %l2, %g0
+ rett %l2 + 4
+
+ .align 4
+ .globl priv_instruction
+priv_instruction:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call do_priv_instruction
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ /* This routine handles unaligned data accesses. */
+ .align 4
+ .globl mna_handler
+mna_handler:
+ andcc %l0, PSR_PS, %g0
+ be mna_fromuser
+ nop
+
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+
+ ld [%l1], %o1
+ call kernel_unaligned_trap
+ add %sp, STACKFRAME_SZ, %o0
+
+ RESTORE_ALL
+
+mna_fromuser:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ ld [%l1], %o1
+ call user_unaligned_trap
+ add %sp, STACKFRAME_SZ, %o0
+
+ RESTORE_ALL
+
+ /* This routine handles floating point disabled traps. */
+ .align 4
+ .globl fpd_trap_handler
+fpd_trap_handler:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call do_fpd_trap
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ /* This routine handles Floating Point Exceptions. */
+ .align 4
+ .globl fpe_trap_handler
+fpe_trap_handler:
+ set fpsave_magic, %l5
+ cmp %l1, %l5
+ be 1f
+ sethi %hi(fpsave), %l5
+ or %l5, %lo(fpsave), %l5
+ cmp %l1, %l5
+ bne 2f
+ sethi %hi(fpsave_catch2), %l5
+ or %l5, %lo(fpsave_catch2), %l5
+ wr %l0, 0x0, %psr
+ WRITE_PAUSE
+ jmp %l5
+ rett %l5 + 4
+1:
+ sethi %hi(fpsave_catch), %l5
+ or %l5, %lo(fpsave_catch), %l5
+ wr %l0, 0x0, %psr
+ WRITE_PAUSE
+ jmp %l5
+ rett %l5 + 4
+
+2:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call do_fpe_trap
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ /* This routine handles Tag Overflow Exceptions. */
+ .align 4
+ .globl do_tag_overflow
+do_tag_overflow:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call handle_tag_overflow
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ /* This routine handles Watchpoint Exceptions. */
+ .align 4
+ .globl do_watchpoint
+do_watchpoint:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call handle_watchpoint
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ /* This routine handles Register Access Exceptions. */
+ .align 4
+ .globl do_reg_access
+do_reg_access:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call handle_reg_access
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ /* This routine handles Co-Processor Disabled Exceptions. */
+ .align 4
+ .globl do_cp_disabled
+do_cp_disabled:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call handle_cp_disabled
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ /* This routine handles Co-Processor Exceptions. */
+ .align 4
+ .globl do_cp_exception
+do_cp_exception:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call handle_cp_exception
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ /* This routine handles Hardware Divide By Zero Exceptions. */
+ .align 4
+ .globl do_hw_divzero
+do_hw_divzero:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr ! re-enable traps
+ WRITE_PAUSE
+
+ add %sp, STACKFRAME_SZ, %o0
+ mov %l1, %o1
+ mov %l2, %o2
+ call handle_hw_divzero
+ mov %l0, %o3
+
+ RESTORE_ALL
+
+ .align 4
+ .globl do_flush_windows
+do_flush_windows:
+ SAVE_ALL
+
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+
+ andcc %l0, PSR_PS, %g0
+ bne dfw_kernel
+ nop
+
+ call flush_user_windows
+ nop
+
+ /* Advance over the trap instruction. */
+ ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
+ add %l1, 0x4, %l2
+ st %l1, [%sp + STACKFRAME_SZ + PT_PC]
+ st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
+
+ RESTORE_ALL
+
+ .globl flush_patch_one
+
+ /* We get these for debugging routines using __builtin_return_address() */
+dfw_kernel:
+flush_patch_one:
+ FLUSH_ALL_KERNEL_WINDOWS
+
+ /* Advance over the trap instruction. */
+ ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
+ add %l1, 0x4, %l2
+ st %l1, [%sp + STACKFRAME_SZ + PT_PC]
+ st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
+
+ RESTORE_ALL
+
+ /* The getcc software trap. The user wants the condition codes from
+ * the %psr in register %g1.
+ */
+
+ .align 4
+ .globl getcc_trap_handler
+getcc_trap_handler:
+ srl %l0, 20, %g1 ! give user
+ and %g1, 0xf, %g1 ! only ICC bits in %psr
+ jmp %l2 ! advance over trap instruction
+ rett %l2 + 0x4 ! like this...
+
+ /* The setcc software trap. The user has condition codes in %g1
+ * that it would like placed in the %psr. Be careful not to flip
+ * any unintentional bits!
+ */
+
+ .align 4
+ .globl setcc_trap_handler
+setcc_trap_handler:
+ sll %g1, 0x14, %l4
+ set PSR_ICC, %l5
+ andn %l0, %l5, %l0 ! clear ICC bits in %psr
+ and %l4, %l5, %l4 ! clear non-ICC bits in user value
+ or %l4, %l0, %l4 ! or them in... mix mix mix
+
+ wr %l4, 0x0, %psr ! set new %psr
+ WRITE_PAUSE ! TI scumbags...
+
+ jmp %l2 ! advance over trap instruction
+ rett %l2 + 0x4 ! like this...
+
+sun4m_nmi_error:
+ /* NMI async memory error handling. */
+ sethi %hi(0x80000000), %l4
+ sethi %hi(sun4m_irq_global), %o5
+ ld [%o5 + %lo(sun4m_irq_global)], %l5
+ st %l4, [%l5 + 0x0c] ! sun4m_irq_global->mask_set=0x80000000
+ WRITE_PAUSE
+ ld [%l5 + 0x00], %g0 ! sun4m_irq_global->pending
+ WRITE_PAUSE
+ or %l0, PSR_PIL, %l4
+ wr %l4, 0x0, %psr
+ WRITE_PAUSE
+ wr %l4, PSR_ET, %psr
+ WRITE_PAUSE
+ call sun4m_nmi
+ nop
+ st %l4, [%l5 + 0x08] ! sun4m_irq_global->mask_clear=0x80000000
+ WRITE_PAUSE
+ ld [%l5 + 0x00], %g0 ! sun4m_irq_global->pending
+ WRITE_PAUSE
+ RESTORE_ALL
+
+#ifndef CONFIG_SMP
+ .align 4
+ .globl linux_trap_ipi15_sun4m
+linux_trap_ipi15_sun4m:
+ SAVE_ALL
+
+ ba sun4m_nmi_error
+ nop
+#endif /* CONFIG_SMP */
+
+ .align 4
+ .globl srmmu_fault
+srmmu_fault:
+ mov 0x400, %l5
+ mov 0x300, %l4
+
+LEON_PI(lda [%l5] ASI_LEON_MMUREGS, %l6) ! read sfar first
+SUN_PI_(lda [%l5] ASI_M_MMUREGS, %l6) ! read sfar first
+
+LEON_PI(lda [%l4] ASI_LEON_MMUREGS, %l5) ! read sfsr last
+SUN_PI_(lda [%l4] ASI_M_MMUREGS, %l5) ! read sfsr last
+
+ andn %l6, 0xfff, %l6
+ srl %l5, 6, %l5 ! and encode all info into l7
+
+ and %l5, 2, %l5
+ or %l5, %l6, %l6
+
+ or %l6, %l7, %l7 ! l7 = [addr,write,txtfault]
+
+ SAVE_ALL
+
+ mov %l7, %o1
+ mov %l7, %o2
+ and %o1, 1, %o1 ! arg2 = text_faultp
+ mov %l7, %o3
+ and %o2, 2, %o2 ! arg3 = writep
+ andn %o3, 0xfff, %o3 ! arg4 = faulting address
+
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+
+ call do_sparc_fault
+ add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
+
+ RESTORE_ALL
+
+ .align 4
+sunos_execv:
+ .globl sunos_execv
+ b sys_execve
+ clr %i2
+
+ .align 4
+ .globl sys_sigstack
+sys_sigstack:
+ mov %o7, %l5
+ mov %fp, %o2
+ call do_sys_sigstack
+ mov %l5, %o7
+
+ .align 4
+ .globl sys_sigreturn
+sys_sigreturn:
+ call do_sigreturn
+ add %sp, STACKFRAME_SZ, %o0
+
+ ld [%curptr + TI_FLAGS], %l5
+ andcc %l5, _TIF_SYSCALL_TRACE, %g0
+ be 1f
+ nop
+
+ call syscall_trace
+ mov 1, %o1
+
+1:
+ /* We don't want to muck with user registers like a
+ * normal syscall, just return.
+ */
+ RESTORE_ALL
+
+ .align 4
+ .globl sys_rt_sigreturn
+sys_rt_sigreturn:
+ call do_rt_sigreturn
+ add %sp, STACKFRAME_SZ, %o0
+
+ ld [%curptr + TI_FLAGS], %l5
+ andcc %l5, _TIF_SYSCALL_TRACE, %g0
+ be 1f
+ nop
+
+ add %sp, STACKFRAME_SZ, %o0
+ call syscall_trace
+ mov 1, %o1
+
+1:
+ /* We are returning to a signal handler. */
+ RESTORE_ALL
+
+ /* Now that we have a real sys_clone, sys_fork() is
+ * implemented in terms of it. Our _real_ implementation
+ * of SunOS vfork() will use sys_vfork().
+ *
+ * XXX These three should be consolidated into mostly shared
+ * XXX code just like on sparc64... -DaveM
+ */
+ .align 4
+ .globl sys_fork, flush_patch_two
+sys_fork:
+ mov %o7, %l5
+flush_patch_two:
+ FLUSH_ALL_KERNEL_WINDOWS;
+ ld [%curptr + TI_TASK], %o4
+ rd %psr, %g4
+ WRITE_PAUSE
+ mov SIGCHLD, %o0 ! arg0: clone flags
+ rd %wim, %g5
+ WRITE_PAUSE
+ mov %fp, %o1 ! arg1: usp
+ std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
+ add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
+ mov 0, %o3
+ call sparc_do_fork
+ mov %l5, %o7
+
+ /* Whee, kernel threads! */
+ .globl sys_clone, flush_patch_three
+sys_clone:
+ mov %o7, %l5
+flush_patch_three:
+ FLUSH_ALL_KERNEL_WINDOWS;
+ ld [%curptr + TI_TASK], %o4
+ rd %psr, %g4
+ WRITE_PAUSE
+
+ /* arg0,1: flags,usp -- loaded already */
+ cmp %o1, 0x0 ! Is new_usp NULL?
+ rd %wim, %g5
+ WRITE_PAUSE
+ be,a 1f
+ mov %fp, %o1 ! yes, use callers usp
+ andn %o1, 7, %o1 ! no, align to 8 bytes
+1:
+ std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
+ add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
+ mov 0, %o3
+ call sparc_do_fork
+ mov %l5, %o7
+
+ /* Whee, real vfork! */
+ .globl sys_vfork, flush_patch_four
+sys_vfork:
+flush_patch_four:
+ FLUSH_ALL_KERNEL_WINDOWS;
+ ld [%curptr + TI_TASK], %o4
+ rd %psr, %g4
+ WRITE_PAUSE
+ rd %wim, %g5
+ WRITE_PAUSE
+ std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
+ sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
+ mov %fp, %o1
+ or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
+ sethi %hi(sparc_do_fork), %l1
+ mov 0, %o3
+ jmpl %l1 + %lo(sparc_do_fork), %g0
+ add %sp, STACKFRAME_SZ, %o2
+
+ .align 4
+linux_sparc_ni_syscall:
+ sethi %hi(sys_ni_syscall), %l7
+ b do_syscall
+ or %l7, %lo(sys_ni_syscall), %l7
+
+linux_syscall_trace:
+ add %sp, STACKFRAME_SZ, %o0
+ call syscall_trace
+ mov 0, %o1
+ cmp %o0, 0
+ bne 3f
+ mov -ENOSYS, %o0
+
+ /* Syscall tracing can modify the registers. */
+ ld [%sp + STACKFRAME_SZ + PT_G1], %g1
+ sethi %hi(sys_call_table), %l7
+ ld [%sp + STACKFRAME_SZ + PT_I0], %i0
+ or %l7, %lo(sys_call_table), %l7
+ ld [%sp + STACKFRAME_SZ + PT_I1], %i1
+ ld [%sp + STACKFRAME_SZ + PT_I2], %i2
+ ld [%sp + STACKFRAME_SZ + PT_I3], %i3
+ ld [%sp + STACKFRAME_SZ + PT_I4], %i4
+ ld [%sp + STACKFRAME_SZ + PT_I5], %i5
+ cmp %g1, NR_syscalls
+ bgeu 3f
+ mov -ENOSYS, %o0
+
+ sll %g1, 2, %l4
+ mov %i0, %o0
+ ld [%l7 + %l4], %l7
+ mov %i1, %o1
+ mov %i2, %o2
+ mov %i3, %o3
+ b 2f
+ mov %i4, %o4
+
+ .globl ret_from_fork
+ret_from_fork:
+ call schedule_tail
+ ld [%g3 + TI_TASK], %o0
+ b ret_sys_call
+ ld [%sp + STACKFRAME_SZ + PT_I0], %o0
+
+ .globl ret_from_kernel_thread
+ret_from_kernel_thread:
+ call schedule_tail
+ ld [%g3 + TI_TASK], %o0
+ ld [%sp + STACKFRAME_SZ + PT_G1], %l0
+ call %l0
+ ld [%sp + STACKFRAME_SZ + PT_G2], %o0
+ rd %psr, %l1
+ ld [%sp + STACKFRAME_SZ + PT_PSR], %l0
+ andn %l0, PSR_CWP, %l0
+ nop
+ and %l1, PSR_CWP, %l1
+ or %l0, %l1, %l0
+ st %l0, [%sp + STACKFRAME_SZ + PT_PSR]
+ b ret_sys_call
+ mov 0, %o0
+
+ /* Linux native system calls enter here... */
+ .align 4
+ .globl linux_sparc_syscall
+linux_sparc_syscall:
+ sethi %hi(PSR_SYSCALL), %l4
+ or %l0, %l4, %l0
+ /* Direct access to user regs, must faster. */
+ cmp %g1, NR_syscalls
+ bgeu linux_sparc_ni_syscall
+ sll %g1, 2, %l4
+ ld [%l7 + %l4], %l7
+
+do_syscall:
+ SAVE_ALL_HEAD
+ rd %wim, %l3
+
+ wr %l0, PSR_ET, %psr
+ mov %i0, %o0
+ mov %i1, %o1
+ mov %i2, %o2
+
+ ld [%curptr + TI_FLAGS], %l5
+ mov %i3, %o3
+ andcc %l5, _TIF_SYSCALL_TRACE, %g0
+ mov %i4, %o4
+ bne linux_syscall_trace
+ mov %i0, %l5
+2:
+ call %l7
+ mov %i5, %o5
+
+3:
+ st %o0, [%sp + STACKFRAME_SZ + PT_I0]
+
+ret_sys_call:
+ ld [%curptr + TI_FLAGS], %l6
+ cmp %o0, -ERESTART_RESTARTBLOCK
+ ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
+ set PSR_C, %g2
+ bgeu 1f
+ andcc %l6, _TIF_SYSCALL_TRACE, %g0
+
+ /* System call success, clear Carry condition code. */
+ andn %g3, %g2, %g3
+ clr %l6
+ st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
+ bne linux_syscall_trace2
+ ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
+ add %l1, 0x4, %l2 /* npc = npc+4 */
+ st %l1, [%sp + STACKFRAME_SZ + PT_PC]
+ b ret_trap_entry
+ st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
+1:
+ /* System call failure, set Carry condition code.
+ * Also, get abs(errno) to return to the process.
+ */
+ sub %g0, %o0, %o0
+ or %g3, %g2, %g3
+ st %o0, [%sp + STACKFRAME_SZ + PT_I0]
+ mov 1, %l6
+ st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
+ bne linux_syscall_trace2
+ ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
+ add %l1, 0x4, %l2 /* npc = npc+4 */
+ st %l1, [%sp + STACKFRAME_SZ + PT_PC]
+ b ret_trap_entry
+ st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
+
+linux_syscall_trace2:
+ add %sp, STACKFRAME_SZ, %o0
+ mov 1, %o1
+ call syscall_trace
+ add %l1, 0x4, %l2 /* npc = npc+4 */
+ st %l1, [%sp + STACKFRAME_SZ + PT_PC]
+ b ret_trap_entry
+ st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
+
+
+/* Saving and restoring the FPU state is best done from lowlevel code.
+ *
+ * void fpsave(unsigned long *fpregs, unsigned long *fsr,
+ * void *fpqueue, unsigned long *fpqdepth)
+ */
+
+ .globl fpsave
+fpsave:
+ st %fsr, [%o1] ! this can trap on us if fpu is in bogon state
+ ld [%o1], %g1
+ set 0x2000, %g4
+ andcc %g1, %g4, %g0
+ be 2f
+ mov 0, %g2
+
+ /* We have an fpqueue to save. */
+1:
+ std %fq, [%o2]
+fpsave_magic:
+ st %fsr, [%o1]
+ ld [%o1], %g3
+ andcc %g3, %g4, %g0
+ add %g2, 1, %g2
+ bne 1b
+ add %o2, 8, %o2
+
+2:
+ st %g2, [%o3]
+
+ std %f0, [%o0 + 0x00]
+ std %f2, [%o0 + 0x08]
+ std %f4, [%o0 + 0x10]
+ std %f6, [%o0 + 0x18]
+ std %f8, [%o0 + 0x20]
+ std %f10, [%o0 + 0x28]
+ std %f12, [%o0 + 0x30]
+ std %f14, [%o0 + 0x38]
+ std %f16, [%o0 + 0x40]
+ std %f18, [%o0 + 0x48]
+ std %f20, [%o0 + 0x50]
+ std %f22, [%o0 + 0x58]
+ std %f24, [%o0 + 0x60]
+ std %f26, [%o0 + 0x68]
+ std %f28, [%o0 + 0x70]
+ retl
+ std %f30, [%o0 + 0x78]
+
+ /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
+ * code for pointing out this possible deadlock, while we save state
+ * above we could trap on the fsr store so our low level fpu trap
+ * code has to know how to deal with this.
+ */
+fpsave_catch:
+ b fpsave_magic + 4
+ st %fsr, [%o1]
+
+fpsave_catch2:
+ b fpsave + 4
+ st %fsr, [%o1]
+
+ /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
+
+ .globl fpload
+fpload:
+ ldd [%o0 + 0x00], %f0
+ ldd [%o0 + 0x08], %f2
+ ldd [%o0 + 0x10], %f4
+ ldd [%o0 + 0x18], %f6
+ ldd [%o0 + 0x20], %f8
+ ldd [%o0 + 0x28], %f10
+ ldd [%o0 + 0x30], %f12
+ ldd [%o0 + 0x38], %f14
+ ldd [%o0 + 0x40], %f16
+ ldd [%o0 + 0x48], %f18
+ ldd [%o0 + 0x50], %f20
+ ldd [%o0 + 0x58], %f22
+ ldd [%o0 + 0x60], %f24
+ ldd [%o0 + 0x68], %f26
+ ldd [%o0 + 0x70], %f28
+ ldd [%o0 + 0x78], %f30
+ ld [%o1], %fsr
+ retl
+ nop
+
+ /* __ndelay and __udelay take two arguments:
+ * 0 - nsecs or usecs to delay
+ * 1 - per_cpu udelay_val (loops per jiffy)
+ *
+ * Note that ndelay gives HZ times higher resolution but has a 10ms
+ * limit. udelay can handle up to 1s.
+ */
+ .globl __ndelay
+__ndelay:
+ save %sp, -STACKFRAME_SZ, %sp
+ mov %i0, %o0 ! round multiplier up so large ns ok
+ mov 0x1ae, %o1 ! 2**32 / (1 000 000 000 / HZ)
+ umul %o0, %o1, %o0
+ rd %y, %o1
+ mov %i1, %o1 ! udelay_val
+ umul %o0, %o1, %o0
+ rd %y, %o1
+ ba delay_continue
+ mov %o1, %o0 ! >>32 later for better resolution
+
+ .globl __udelay
+__udelay:
+ save %sp, -STACKFRAME_SZ, %sp
+ mov %i0, %o0
+ sethi %hi(0x10c7), %o1 ! round multiplier up so large us ok
+ or %o1, %lo(0x10c7), %o1 ! 2**32 / 1 000 000
+ umul %o0, %o1, %o0
+ rd %y, %o1
+ mov %i1, %o1 ! udelay_val
+ umul %o0, %o1, %o0
+ rd %y, %o1
+ sethi %hi(0x028f4b62), %l0 ! Add in rounding constant * 2**32,
+ or %g0, %lo(0x028f4b62), %l0
+ addcc %o0, %l0, %o0 ! 2**32 * 0.009 999
+ bcs,a 3f
+ add %o1, 0x01, %o1
+3:
+ mov HZ, %o0 ! >>32 earlier for wider range
+ umul %o0, %o1, %o0
+ rd %y, %o1
+
+delay_continue:
+ cmp %o0, 0x0
+1:
+ bne 1b
+ subcc %o0, 1, %o0
+
+ ret
+ restore
+EXPORT_SYMBOL(__udelay)
+EXPORT_SYMBOL(__ndelay)
+
+ /* Handle a software breakpoint */
+ /* We have to inform parent that child has stopped */
+ .align 4
+ .globl breakpoint_trap
+breakpoint_trap:
+ rd %wim,%l3
+ SAVE_ALL
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+
+ st %i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
+ call sparc_breakpoint
+ add %sp, STACKFRAME_SZ, %o0
+
+ RESTORE_ALL
+
+#ifdef CONFIG_KGDB
+ ENTRY(kgdb_trap_low)
+ rd %wim,%l3
+ SAVE_ALL
+ wr %l0, PSR_ET, %psr
+ WRITE_PAUSE
+
+ mov %l7, %o0 ! trap_level
+ call kgdb_trap
+ add %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
+
+ RESTORE_ALL
+ ENDPROC(kgdb_trap_low)
+#endif
+
+ .align 4
+ .globl flush_patch_exception
+flush_patch_exception:
+ FLUSH_ALL_KERNEL_WINDOWS;
+ ldd [%o0], %o6
+ jmpl %o7 + 0xc, %g0 ! see asm-sparc/processor.h
+ mov 1, %g1 ! signal EFAULT condition
+
+ .align 4
+ .globl kill_user_windows, kuw_patch1_7win
+ .globl kuw_patch1
+kuw_patch1_7win: sll %o3, 6, %o3
+
+ /* No matter how much overhead this routine has in the worst
+ * case scenario, it is several times better than taking the
+ * traps with the old method of just doing flush_user_windows().
+ */
+kill_user_windows:
+ ld [%g6 + TI_UWINMASK], %o0 ! get current umask
+ orcc %g0, %o0, %g0 ! if no bits set, we are done
+ be 3f ! nothing to do
+ rd %psr, %o5 ! must clear interrupts
+ or %o5, PSR_PIL, %o4 ! or else that could change
+ wr %o4, 0x0, %psr ! the uwinmask state
+ WRITE_PAUSE ! burn them cycles
+1:
+ ld [%g6 + TI_UWINMASK], %o0 ! get consistent state
+ orcc %g0, %o0, %g0 ! did an interrupt come in?
+ be 4f ! yep, we are done
+ rd %wim, %o3 ! get current wim
+ srl %o3, 1, %o4 ! simulate a save
+kuw_patch1:
+ sll %o3, 7, %o3 ! compute next wim
+ or %o4, %o3, %o3 ! result
+ andncc %o0, %o3, %o0 ! clean this bit in umask
+ bne kuw_patch1 ! not done yet
+ srl %o3, 1, %o4 ! begin another save simulation
+ wr %o3, 0x0, %wim ! set the new wim
+ st %g0, [%g6 + TI_UWINMASK] ! clear uwinmask
+4:
+ wr %o5, 0x0, %psr ! re-enable interrupts
+ WRITE_PAUSE ! burn baby burn
+3:
+ retl ! return
+ st %g0, [%g6 + TI_W_SAVED] ! no windows saved
+
+ .align 4
+ .globl restore_current
+restore_current:
+ LOAD_CURRENT(g6, o0)
+ retl
+ nop
+
+#ifdef CONFIG_PCIC_PCI
+#include <asm/pcic.h>
+
+ .align 4
+ .globl linux_trap_ipi15_pcic
+linux_trap_ipi15_pcic:
+ rd %wim, %l3
+ SAVE_ALL
+
+ /*
+ * First deactivate NMI
+ * or we cannot drop ET, cannot get window spill traps.
+ * The busy loop is necessary because the PIO error
+ * sometimes does not go away quickly and we trap again.
+ */
+ sethi %hi(pcic_regs), %o1
+ ld [%o1 + %lo(pcic_regs)], %o2
+
+ ! Get pending status for printouts later.
+ ld [%o2 + PCI_SYS_INT_PENDING], %o0
+
+ mov PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
+ stb %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
+1:
+ ld [%o2 + PCI_SYS_INT_PENDING], %o1
+ andcc %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
+ bne 1b
+ nop
+
+ or %l0, PSR_PIL, %l4
+ wr %l4, 0x0, %psr
+ WRITE_PAUSE
+ wr %l4, PSR_ET, %psr
+ WRITE_PAUSE
+
+ call pcic_nmi
+ add %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
+ RESTORE_ALL
+
+ .globl pcic_nmi_trap_patch
+pcic_nmi_trap_patch:
+ sethi %hi(linux_trap_ipi15_pcic), %l3
+ jmpl %l3 + %lo(linux_trap_ipi15_pcic), %g0
+ rd %psr, %l0
+ .word 0
+
+#endif /* CONFIG_PCIC_PCI */
+
+ .globl flushw_all
+flushw_all:
+ save %sp, -0x40, %sp
+ save %sp, -0x40, %sp
+ save %sp, -0x40, %sp
+ save %sp, -0x40, %sp
+ save %sp, -0x40, %sp
+ save %sp, -0x40, %sp
+ save %sp, -0x40, %sp
+ restore
+ restore
+ restore
+ restore
+ restore
+ restore
+ ret
+ restore
+
+#ifdef CONFIG_SMP
+ENTRY(hard_smp_processor_id)
+661: rd %tbr, %g1
+ srl %g1, 12, %o0
+ and %o0, 3, %o0
+ .section .cpuid_patch, "ax"
+ /* Instruction location. */
+ .word 661b
+ /* SUN4D implementation. */
+ lda [%g0] ASI_M_VIKING_TMP1, %o0
+ nop
+ nop
+ /* LEON implementation. */
+ rd %asr17, %o0
+ srl %o0, 0x1c, %o0
+ nop
+ .previous
+ retl
+ nop
+ENDPROC(hard_smp_processor_id)
+#endif
+
+/* End of entry.S */