394 lines
8.7 KiB
ArmAsm
394 lines
8.7 KiB
ArmAsm
/*
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* gdb-low.S contains the low-level trap handler for the GDB stub.
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*
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* Copyright (C) 1995 Andreas Busse
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*/
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#include <linux/sys.h>
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#include <asm/asm.h>
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#include <asm/errno.h>
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#include <asm/irqflags.h>
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#include <asm/mipsregs.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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#include <asm/gdb-stub.h>
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#ifdef CONFIG_32BIT
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#define DMFC0 mfc0
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#define DMTC0 mtc0
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#define LDC1 lwc1
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#define SDC1 lwc1
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#endif
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#ifdef CONFIG_64BIT
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#define DMFC0 dmfc0
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#define DMTC0 dmtc0
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#define LDC1 ldc1
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#define SDC1 ldc1
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#endif
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/*
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* [jsun] We reserves about 2x GDB_FR_SIZE in stack. The lower (addressed)
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* part is used to store registers and passed to exception handler.
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* The upper part is reserved for "call func" feature where gdb client
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* saves some of the regs, setups call frame and passes args.
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*
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* A trace shows about 200 bytes are used to store about half of all regs.
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* The rest should be big enough for frame setup and passing args.
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*/
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/*
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* The low level trap handler
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*/
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.align 5
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NESTED(trap_low, GDB_FR_SIZE, sp)
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.set noat
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.set noreorder
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mfc0 k0, CP0_STATUS
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sll k0, 3 /* extract cu0 bit */
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bltz k0, 1f
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move k1, sp
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/*
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* Called from user mode, go somewhere else.
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*/
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mfc0 k0, CP0_CAUSE
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andi k0, k0, 0x7c
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#ifdef CONFIG_64BIT
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dsll k0, k0, 1
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#endif
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PTR_L k1, saved_vectors(k0)
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jr k1
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nop
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1:
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move k0, sp
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PTR_SUBU sp, k1, GDB_FR_SIZE*2 # see comment above
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LONG_S k0, GDB_FR_REG29(sp)
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LONG_S $2, GDB_FR_REG2(sp)
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/*
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* First save the CP0 and special registers
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*/
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mfc0 v0, CP0_STATUS
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LONG_S v0, GDB_FR_STATUS(sp)
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mfc0 v0, CP0_CAUSE
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LONG_S v0, GDB_FR_CAUSE(sp)
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DMFC0 v0, CP0_EPC
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LONG_S v0, GDB_FR_EPC(sp)
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DMFC0 v0, CP0_BADVADDR
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LONG_S v0, GDB_FR_BADVADDR(sp)
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mfhi v0
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LONG_S v0, GDB_FR_HI(sp)
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mflo v0
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LONG_S v0, GDB_FR_LO(sp)
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/*
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* Now the integer registers
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*/
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LONG_S zero, GDB_FR_REG0(sp) /* I know... */
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LONG_S $1, GDB_FR_REG1(sp)
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/* v0 already saved */
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LONG_S $3, GDB_FR_REG3(sp)
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LONG_S $4, GDB_FR_REG4(sp)
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LONG_S $5, GDB_FR_REG5(sp)
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LONG_S $6, GDB_FR_REG6(sp)
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LONG_S $7, GDB_FR_REG7(sp)
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LONG_S $8, GDB_FR_REG8(sp)
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LONG_S $9, GDB_FR_REG9(sp)
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LONG_S $10, GDB_FR_REG10(sp)
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LONG_S $11, GDB_FR_REG11(sp)
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LONG_S $12, GDB_FR_REG12(sp)
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LONG_S $13, GDB_FR_REG13(sp)
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LONG_S $14, GDB_FR_REG14(sp)
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LONG_S $15, GDB_FR_REG15(sp)
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LONG_S $16, GDB_FR_REG16(sp)
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LONG_S $17, GDB_FR_REG17(sp)
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LONG_S $18, GDB_FR_REG18(sp)
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LONG_S $19, GDB_FR_REG19(sp)
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LONG_S $20, GDB_FR_REG20(sp)
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LONG_S $21, GDB_FR_REG21(sp)
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LONG_S $22, GDB_FR_REG22(sp)
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LONG_S $23, GDB_FR_REG23(sp)
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LONG_S $24, GDB_FR_REG24(sp)
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LONG_S $25, GDB_FR_REG25(sp)
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LONG_S $26, GDB_FR_REG26(sp)
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LONG_S $27, GDB_FR_REG27(sp)
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LONG_S $28, GDB_FR_REG28(sp)
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/* sp already saved */
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LONG_S $30, GDB_FR_REG30(sp)
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LONG_S $31, GDB_FR_REG31(sp)
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CLI /* disable interrupts */
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TRACE_IRQS_OFF
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/*
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* Followed by the floating point registers
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*/
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mfc0 v0, CP0_STATUS /* FPU enabled? */
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srl v0, v0, 16
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andi v0, v0, (ST0_CU1 >> 16)
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beqz v0,2f /* disabled, skip */
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nop
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SDC1 $0, GDB_FR_FPR0(sp)
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SDC1 $1, GDB_FR_FPR1(sp)
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SDC1 $2, GDB_FR_FPR2(sp)
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SDC1 $3, GDB_FR_FPR3(sp)
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SDC1 $4, GDB_FR_FPR4(sp)
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SDC1 $5, GDB_FR_FPR5(sp)
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SDC1 $6, GDB_FR_FPR6(sp)
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SDC1 $7, GDB_FR_FPR7(sp)
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SDC1 $8, GDB_FR_FPR8(sp)
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SDC1 $9, GDB_FR_FPR9(sp)
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SDC1 $10, GDB_FR_FPR10(sp)
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SDC1 $11, GDB_FR_FPR11(sp)
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SDC1 $12, GDB_FR_FPR12(sp)
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SDC1 $13, GDB_FR_FPR13(sp)
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SDC1 $14, GDB_FR_FPR14(sp)
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SDC1 $15, GDB_FR_FPR15(sp)
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SDC1 $16, GDB_FR_FPR16(sp)
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SDC1 $17, GDB_FR_FPR17(sp)
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SDC1 $18, GDB_FR_FPR18(sp)
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SDC1 $19, GDB_FR_FPR19(sp)
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SDC1 $20, GDB_FR_FPR20(sp)
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SDC1 $21, GDB_FR_FPR21(sp)
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SDC1 $22, GDB_FR_FPR22(sp)
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SDC1 $23, GDB_FR_FPR23(sp)
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SDC1 $24, GDB_FR_FPR24(sp)
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SDC1 $25, GDB_FR_FPR25(sp)
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SDC1 $26, GDB_FR_FPR26(sp)
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SDC1 $27, GDB_FR_FPR27(sp)
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SDC1 $28, GDB_FR_FPR28(sp)
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SDC1 $29, GDB_FR_FPR29(sp)
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SDC1 $30, GDB_FR_FPR30(sp)
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SDC1 $31, GDB_FR_FPR31(sp)
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/*
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* FPU control registers
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*/
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cfc1 v0, CP1_STATUS
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LONG_S v0, GDB_FR_FSR(sp)
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cfc1 v0, CP1_REVISION
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LONG_S v0, GDB_FR_FIR(sp)
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/*
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* Current stack frame ptr
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*/
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2:
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LONG_S sp, GDB_FR_FRP(sp)
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/*
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* CP0 registers (R4000/R4400 unused registers skipped)
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*/
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mfc0 v0, CP0_INDEX
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LONG_S v0, GDB_FR_CP0_INDEX(sp)
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mfc0 v0, CP0_RANDOM
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LONG_S v0, GDB_FR_CP0_RANDOM(sp)
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DMFC0 v0, CP0_ENTRYLO0
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LONG_S v0, GDB_FR_CP0_ENTRYLO0(sp)
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DMFC0 v0, CP0_ENTRYLO1
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LONG_S v0, GDB_FR_CP0_ENTRYLO1(sp)
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DMFC0 v0, CP0_CONTEXT
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LONG_S v0, GDB_FR_CP0_CONTEXT(sp)
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mfc0 v0, CP0_PAGEMASK
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LONG_S v0, GDB_FR_CP0_PAGEMASK(sp)
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mfc0 v0, CP0_WIRED
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LONG_S v0, GDB_FR_CP0_WIRED(sp)
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DMFC0 v0, CP0_ENTRYHI
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LONG_S v0, GDB_FR_CP0_ENTRYHI(sp)
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mfc0 v0, CP0_PRID
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LONG_S v0, GDB_FR_CP0_PRID(sp)
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.set at
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/*
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* Continue with the higher level handler
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*/
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move a0,sp
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jal handle_exception
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nop
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/*
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* Restore all writable registers, in reverse order
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*/
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.set noat
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LONG_L v0, GDB_FR_CP0_ENTRYHI(sp)
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LONG_L v1, GDB_FR_CP0_WIRED(sp)
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DMTC0 v0, CP0_ENTRYHI
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mtc0 v1, CP0_WIRED
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LONG_L v0, GDB_FR_CP0_PAGEMASK(sp)
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LONG_L v1, GDB_FR_CP0_ENTRYLO1(sp)
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mtc0 v0, CP0_PAGEMASK
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DMTC0 v1, CP0_ENTRYLO1
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LONG_L v0, GDB_FR_CP0_ENTRYLO0(sp)
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LONG_L v1, GDB_FR_CP0_INDEX(sp)
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DMTC0 v0, CP0_ENTRYLO0
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LONG_L v0, GDB_FR_CP0_CONTEXT(sp)
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mtc0 v1, CP0_INDEX
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DMTC0 v0, CP0_CONTEXT
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/*
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* Next, the floating point registers
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*/
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mfc0 v0, CP0_STATUS /* check if the FPU is enabled */
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srl v0, v0, 16
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andi v0, v0, (ST0_CU1 >> 16)
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beqz v0, 3f /* disabled, skip */
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nop
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LDC1 $31, GDB_FR_FPR31(sp)
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LDC1 $30, GDB_FR_FPR30(sp)
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LDC1 $29, GDB_FR_FPR29(sp)
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LDC1 $28, GDB_FR_FPR28(sp)
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LDC1 $27, GDB_FR_FPR27(sp)
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LDC1 $26, GDB_FR_FPR26(sp)
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LDC1 $25, GDB_FR_FPR25(sp)
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LDC1 $24, GDB_FR_FPR24(sp)
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LDC1 $23, GDB_FR_FPR23(sp)
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LDC1 $22, GDB_FR_FPR22(sp)
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LDC1 $21, GDB_FR_FPR21(sp)
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LDC1 $20, GDB_FR_FPR20(sp)
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LDC1 $19, GDB_FR_FPR19(sp)
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LDC1 $18, GDB_FR_FPR18(sp)
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LDC1 $17, GDB_FR_FPR17(sp)
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LDC1 $16, GDB_FR_FPR16(sp)
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LDC1 $15, GDB_FR_FPR15(sp)
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LDC1 $14, GDB_FR_FPR14(sp)
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LDC1 $13, GDB_FR_FPR13(sp)
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LDC1 $12, GDB_FR_FPR12(sp)
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LDC1 $11, GDB_FR_FPR11(sp)
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LDC1 $10, GDB_FR_FPR10(sp)
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LDC1 $9, GDB_FR_FPR9(sp)
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LDC1 $8, GDB_FR_FPR8(sp)
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LDC1 $7, GDB_FR_FPR7(sp)
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LDC1 $6, GDB_FR_FPR6(sp)
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LDC1 $5, GDB_FR_FPR5(sp)
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LDC1 $4, GDB_FR_FPR4(sp)
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LDC1 $3, GDB_FR_FPR3(sp)
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LDC1 $2, GDB_FR_FPR2(sp)
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LDC1 $1, GDB_FR_FPR1(sp)
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LDC1 $0, GDB_FR_FPR0(sp)
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/*
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* Now the CP0 and integer registers
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*/
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3:
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#ifdef CONFIG_MIPS_MT_SMTC
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/* Read-modify write of Status must be atomic */
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mfc0 t2, CP0_TCSTATUS
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ori t1, t2, TCSTATUS_IXMT
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mtc0 t1, CP0_TCSTATUS
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andi t2, t2, TCSTATUS_IXMT
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_ehb
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DMT 9 # dmt t1
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jal mips_ihb
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nop
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#endif /* CONFIG_MIPS_MT_SMTC */
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mfc0 t0, CP0_STATUS
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ori t0, 0x1f
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xori t0, 0x1f
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mtc0 t0, CP0_STATUS
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#ifdef CONFIG_MIPS_MT_SMTC
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andi t1, t1, VPECONTROL_TE
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beqz t1, 9f
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nop
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EMT # emt
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9:
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mfc0 t1, CP0_TCSTATUS
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xori t1, t1, TCSTATUS_IXMT
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or t1, t1, t2
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mtc0 t1, CP0_TCSTATUS
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_ehb
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#endif /* CONFIG_MIPS_MT_SMTC */
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LONG_L v0, GDB_FR_STATUS(sp)
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LONG_L v1, GDB_FR_EPC(sp)
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mtc0 v0, CP0_STATUS
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DMTC0 v1, CP0_EPC
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LONG_L v0, GDB_FR_HI(sp)
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LONG_L v1, GDB_FR_LO(sp)
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mthi v0
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mtlo v1
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LONG_L $31, GDB_FR_REG31(sp)
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LONG_L $30, GDB_FR_REG30(sp)
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LONG_L $28, GDB_FR_REG28(sp)
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LONG_L $27, GDB_FR_REG27(sp)
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LONG_L $26, GDB_FR_REG26(sp)
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LONG_L $25, GDB_FR_REG25(sp)
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LONG_L $24, GDB_FR_REG24(sp)
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LONG_L $23, GDB_FR_REG23(sp)
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LONG_L $22, GDB_FR_REG22(sp)
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LONG_L $21, GDB_FR_REG21(sp)
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LONG_L $20, GDB_FR_REG20(sp)
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LONG_L $19, GDB_FR_REG19(sp)
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LONG_L $18, GDB_FR_REG18(sp)
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LONG_L $17, GDB_FR_REG17(sp)
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LONG_L $16, GDB_FR_REG16(sp)
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LONG_L $15, GDB_FR_REG15(sp)
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LONG_L $14, GDB_FR_REG14(sp)
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LONG_L $13, GDB_FR_REG13(sp)
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LONG_L $12, GDB_FR_REG12(sp)
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LONG_L $11, GDB_FR_REG11(sp)
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LONG_L $10, GDB_FR_REG10(sp)
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LONG_L $9, GDB_FR_REG9(sp)
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LONG_L $8, GDB_FR_REG8(sp)
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LONG_L $7, GDB_FR_REG7(sp)
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LONG_L $6, GDB_FR_REG6(sp)
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LONG_L $5, GDB_FR_REG5(sp)
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LONG_L $4, GDB_FR_REG4(sp)
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LONG_L $3, GDB_FR_REG3(sp)
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LONG_L $2, GDB_FR_REG2(sp)
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LONG_L $1, GDB_FR_REG1(sp)
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#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
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LONG_L k0, GDB_FR_EPC(sp)
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LONG_L $29, GDB_FR_REG29(sp) /* Deallocate stack */
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jr k0
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rfe
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#else
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LONG_L sp, GDB_FR_REG29(sp) /* Deallocate stack */
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.set mips3
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eret
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.set mips0
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#endif
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.set at
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.set reorder
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END(trap_low)
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LEAF(kgdb_read_byte)
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4: lb t0, (a0)
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sb t0, (a1)
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li v0, 0
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jr ra
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.section __ex_table,"a"
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PTR 4b, kgdbfault
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.previous
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END(kgdb_read_byte)
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LEAF(kgdb_write_byte)
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5: sb a0, (a1)
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li v0, 0
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jr ra
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.section __ex_table,"a"
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PTR 5b, kgdbfault
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.previous
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END(kgdb_write_byte)
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.type kgdbfault@function
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.ent kgdbfault
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kgdbfault: li v0, -EFAULT
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jr ra
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.end kgdbfault
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