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Version:
3.0.0 ▾
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/* Copyright (C) 1994, 1995 Charles Sandmann (sandmann@clio.rice.edu)
* This file maybe freely distributed and modified as long as copyright remains.
*/
EAX = 0
EBX = 4
ECX = 8
EDX = 12
ESI = 16
EDI = 20
EBP = 24
ESP = 28
EIP = 32
EFLAGS = 36
CS = 40
DS = 42
ES = 44
FS = 46
GS = 48
SS = 50
ERRCODE = 52
EXCEPNO = 56
PREVEXC = 60
/* Length 64 bytes plus non-used FPU */
.data
.balign 8
.comm exception_stack, 8000
.text
.balign 16,,7
.macro EXCEPTION_ENTRY number
pushl \number
jmp exception_handler
.endm
.global ___djgpp_exception_table
___djgpp_exception_table:
EXCEPTION_ENTRY $18
EXCEPTION_ENTRY $19
EXCEPTION_ENTRY $0
EXCEPTION_ENTRY $1
EXCEPTION_ENTRY $2
EXCEPTION_ENTRY $3
EXCEPTION_ENTRY $4
EXCEPTION_ENTRY $5
EXCEPTION_ENTRY $6
EXCEPTION_ENTRY $7
EXCEPTION_ENTRY $8
EXCEPTION_ENTRY $9
EXCEPTION_ENTRY $10
EXCEPTION_ENTRY $11
EXCEPTION_ENTRY $12
EXCEPTION_ENTRY $13
EXCEPTION_ENTRY $14
EXCEPTION_ENTRY $15
EXCEPTION_ENTRY $16
EXCEPTION_ENTRY $17
/* This code is called any time an exception occurs in the 32 bit protected
;* mode code. The exception number is pushed on the stack. This is called
;* on a locked stack with interrupts disabled. Don't try to terminate.
;*
;* [ * | SS ] * Don't modify
;* [ ESP ]
;* [ EFLAGS ]
;* [ * | CS ] * Don't modify
;* [ EIP ]
;* [ ERR CODE ]
;* [ * |RET CS*] * Don't modify
;* [ RET EIP* ] * Don't modify
;* [ EXCEPTION # ] (And later EBP)
;*/
/* ;WARNING WARNING WARNING
;The mechanism for passing signals between the debugger
;and the debuggee relies on the *exact* instructions between
;EXCEPTION_ENTRY($13) above and "cmpb $0, forced" instruction
;below! These instructions are stored in forced_test[] buffer
;in src/debug/common/dbgcom.c. Do NOT change anything between
;these two instructions, or you will break signal support in
;the debuggers!! */
exception_handler:
pushl %ebx
pushl %ds
.byte 0x2e /* CS: */
cmpb $0, forced
je not_forced
call limitFix
.byte 0x2e /* CS: */
movzbl forced,%ebx
movl %ebx,8(%esp) /* replace EXCEPNO */
cmpb $0x75, %bl
jne not_forced
movzwl ___djgpp_fpu_state,%ebx
movl %ebx,20(%esp) /* set ERRCODE to FPU state */
not_forced:
movw %cs:___djgpp_our_DS, %ds
movl $0x10000, forced /* its zero now, flag inuse */
movl $exception_state, %ebx
popl DS(%ebx)
popl EBX(%ebx)
popl EXCEPNO(%ebx)
movl %esi, ESI(%ebx)
movl %edi, EDI(%ebx)
movl %ebp, EBP(%ebx)
movl %eax, EAX(%ebx)
movl %ecx, ECX(%ebx)
movl %edx, EDX(%ebx)
movw %es, ES(%ebx)
movw %fs, FS(%ebx)
movw %gs, GS(%ebx)
movl ___djgpp_exception_state_ptr, %eax
movl %eax, PREVEXC(%ebx)
/* Stack clean at this point, DS:[EBX] points to exception_state, all
register information saved. Now get the info on stack. */
pushl %ebp
movl %esp, %ebp /* load ebp with stack for easy access */
movl 12(%ebp), %eax
movl %eax, ERRCODE(%ebx)
movl 16(%ebp), %eax
movl %eax, EIP(%ebx)
movl 20(%ebp), %eax
movw %ax, CS(%ebx)
movl 24(%ebp), %eax
movl %eax, EFLAGS(%ebx)
andb $0xfe, %ah /* Clear trace flag */
movl %eax, 24(%ebp) /* and restore on stack */
movl 28(%ebp), %eax
movl %eax, ESP(%ebx)
movl 32(%ebp), %eax
movw %ax, SS(%ebx)
movl $dpmi_exception_proc1, 16(%ebp) /* where to return */
movw %cs, 20(%ebp)
/* Change to our local stack on return from exception (maybe stack exception) */
movw %ds, %ax
cmpb $12,EXCEPNO(%ebx) /* Stack fault ? */
je 1f
cmpw %ax,32(%ebp)
je stack_ok
.byte 0x2e /* CS: */
movw ___djgpp_ds_alias,%di
cmpw %di,32(%ebp) /* if it's DS alias, switch to normal DS */
jne 1f
movw %ax,32(%ebp)
jmp stack_ok
1: movl $exception_stack+8000, 28(%ebp)
movw %ax, 32(%ebp)
stack_ok:
/* Now copy the exception structure to the new stack before returning */
movw %ax, %es
movl %ebx,%esi
movl 28(%ebp), %edi
subl $92, %edi /* 64 plus extra for longjmp */
movl %edi, 28(%ebp)
movl %edi, ___djgpp_exception_state_ptr
movl $16, %ecx
cld
rep
movsl
movl EAX(%ebx), %eax /* restore regs */
movl ESI(%ebx), %esi
movl EDI(%ebx), %edi
movl ECX(%ebx), %ecx
movw ES(%ebx), %es
popl %ebp
pushl EBX(%ebx)
pushl DS(%ebx)
movb $0, forced+2 /* flag non-use */
popl %ds
popl %ebx
lret
/* Code to fix fake exception, EBX destroyed. Note, app_DS may == our_DS! */
.balign 16,,7
limitFix:
pushl %eax
pushl %ecx
pushl %edx
.byte 0x2e /* CS: */
movl ___djgpp_app_DS, %ebx /* avoid size prefix */
.byte 0x2e /* CS: */
movl ds_limit, %edx
movl %edx, %ecx
shrl $16, %ecx
movw $0x0008, %ax
int $0x31 /* Set segment limit */
popl %edx
popl %ecx
popl %eax
ret
/* This local routine preprocesses a return request to the C code. It checks
to make sure the DS & SS are set OK for C code. If not, it sets them up */
.balign 16,,7
dpmi_exception_proc1:
cld
.byte 0x2e /* CS: !!! */
movw ___djgpp_our_DS, %bx /* to be sure */
movw %bx, %ds
movw %bx, %es
/* Note: SS:ESP should be set properly by exception routine */
jmp ___djgpp_exception_processor
/* This code is called by a user routine wishing to save an interrupt
;* state. It will return with a clean stack, our DS,ES,SS.
;* Minor bug: uses static exception_state for a short window without
;* interrupts guaranteed disabled.
;*
;* [ EFLAGS ]
;* [ * | CS ]
;* [ EIP ]
;* [ CALLING EIP ]
;*/
.balign 16,,7
.globl ___djgpp_save_interrupt_regs
___djgpp_save_interrupt_regs:
pushl %esi
pushl %ds
movw %cs:___djgpp_our_DS, %ds
movl $exception_state, %esi
popl DS(%esi) /* Trashes ES but OK */
popl ESI(%esi)
movl %edi, EDI(%esi)
movl %ebp, EBP(%esi)
movl %eax, EAX(%esi)
movl %ebx, EBX(%esi)
movl %ecx, ECX(%esi)
movl %edx, EDX(%esi)
popl %edx /* Save calling EIP */
popl EIP(%esi)
popl %eax
movw %ax,CS(%esi) /* Don't pop, nukes DS */
popl EFLAGS(%esi)
movl %esp, ESP(%esi)
movw %es, ES(%esi)
movw %fs, FS(%esi)
movw %gs, GS(%esi)
movw %ss, SS(%esi)
movl ___djgpp_exception_state_ptr, %eax
movl %eax, PREVEXC(%esi)
cld
movw %ds, %ax
movw %ax, %es
movw %ss, %bx
cmpw %ax, %bx /* is SS = DS ? */
je Lss_ok
movw %ax, %ss /* set new SS:ESP */
movl $exception_stack+8000, %esp
Lss_ok: subl $92, %esp /* 64 plus extra for longjmp */
movl %esp, %edi
movl $16, %ecx
movl %edi, ___djgpp_exception_state_ptr
rep
movsl /* Copy structure to stack */
jmp *%edx /* A "return" */
.balign 8 /* We will touch this; it must be locked */
.global ___djgpp_hw_lock_start
___djgpp_hw_lock_start:
/* src/debug/common/dbgcom.c knows that `ds_limit' is stored
4 bytes before `forced' and relies on that. Do NOT change that! */
ds_limit: .long 0
forced: .long 0
.global ___djgpp_cbrk_count
___djgpp_cbrk_count: .long 0
.global ___djgpp_timer_countdown
___djgpp_timer_countdown: .long 0
.global ___djgpp_our_DS
___djgpp_our_DS: .word 0
.global ___djgpp_app_DS
___djgpp_app_DS: .word 0
.global ___djgpp_dos_sel
___djgpp_dos_sel: .word 0
.global ___djgpp_hwint_flags
___djgpp_hwint_flags: .word 0
.global ___djgpp_sigint_key
___djgpp_sigint_key: .word 0 /* scan code and kb status */
.global ___djgpp_sigint_mask
___djgpp_sigint_mask: .word 0 /* kb status mask */
.global ___djgpp_sigquit_key
___djgpp_sigquit_key: .word 0
.global ___djgpp_sigquit_mask
___djgpp_sigquit_mask: .word 0
.global ___djgpp_old_kbd
___djgpp_old_kbd: .long 0,0
.global ___djgpp_old_timer
___djgpp_old_timer: .long 0,0
.global ___djgpp_exception_state_ptr
___djgpp_exception_state_ptr: .long 0
exception_state: .space 64
.global ___djgpp_ds_alias
___djgpp_ds_alias: .word 0 /* used in dpmi/api/d0303.s (alloc rmcb) */
.global ___djgpp_fpu_state
___djgpp_fpu_state: .word 0
.balign 16,,7
.global ___djgpp_npx_hdlr
___djgpp_npx_hdlr:
fnstsw ___djgpp_fpu_state
fnclex
pushl %eax
xorl %eax,%eax
outb %al,$0x0f0
movb $0x20,%al
outb %al,$0x0a0
outb %al,$0x020
movb $0x75,%al
hw_to_excp:
call ___djgpp_hw_exception
popl %eax
sti
iret
.balign 16,,7
.global ___djgpp_kbd_hdlr
___djgpp_kbd_hdlr:
pushl %eax
pushl %ebx
pushl %ds
.byte 0x2e /* CS: */
testb $1, ___djgpp_hwint_flags /* Disable? */
jne Lkbd_chain
movw %cs:___djgpp_dos_sel, %ds /* Conventional mem selector */
/* movw $0x7021,0xb0f00 */ /* Test code - write to mono */
/* Check Keyboard status bits */
movb 0x417,%ah /* Get KB status byte */
testb $1,%ah
je 6f
orb $2,%ah /* If RShift is set, set LShift as well */
6:
inb $0x60,%al /* Read the scan code */
99:
movb %ah,%bh /* Save KB status */
andb %cs:___djgpp_sigint_mask, %ah /* Mask off irrelevant bits */
cmpw %cs:___djgpp_sigint_key, %ax /* Test for SIGINT */
jne 7f
movb $0x79,%bh /* SIGINT */
jmp 98f
7:
movb %bh,%ah /* Restore KB status */
andb %cs:___djgpp_sigquit_mask, %ah /* Mask off irrelevant bits */
cmpw %cs:___djgpp_sigquit_key, %ax /* Test for SIGQUIT*/
jne Lkbd_chain
movb $0x7a,%bh /* SIGQUIT */
/* Clear interrupt, (later: remove byte from controller?)
movb $0x20,%al
outb %al,$0x020 */
98:
movb %bh,%al
call ___djgpp_hw_exception
Lkbd_chain:
popl %ds
popl %ebx
popl %eax
ljmp %cs:___djgpp_old_kbd
.balign 16,,7
.global ___djgpp_kbd_hdlr_pc98
___djgpp_kbd_hdlr_pc98:
pushl %eax
pushl %ebx
pushl %ds
.byte 0x2e /* CS: */
testb $1, ___djgpp_hwint_flags /* Disable? */
jne Lkbd_chain
/* Check CTRL state */
movw %cs:___djgpp_dos_sel, %ds /* Conventional mem selector */
movb 0x053a,%al /* Get KB status byte */
/* Convert PC98 style status byte to PC/AT style */
movb %al,%ah
andb $0x09,%ah /* GRPH(=ALT), SHIFT(=R-Shift) */
testb $0x02,%al
je 981f
orb $0x40,%ah /* CAPS(=Caps Lock) */
981: testb $0x10,%al
je 982f
orb $0x04,%ah /* CTRL(=Ctrl) */
982: testb $0x01,%al
je 983f
orb $0x02,%ah /* SHIFT(=L-Shift) */
983: testb $0x04,%al
je 984f
orb $0x20,%ah /* KANA(=NUM Lock) */
984: inb $0x41,%al /* Read the scan code */
jmp 99b
.balign 16,,7
.global ___djgpp_timer_hdlr
___djgpp_timer_hdlr:
.byte 0x2e /* CS: */
cmpl $0,___djgpp_timer_countdown
je 4f
pushl %ds
movw %cs:___djgpp_ds_alias, %ds
decl ___djgpp_timer_countdown
popl %ds
jmp 3f
4:
pushl %eax
movb $0x78,%al
call ___djgpp_hw_exception
popl %eax
3:
.byte 0x2e /* CS: */
testb $4, ___djgpp_hwint_flags /* IRET or chain? */
jne 2f
ljmp %cs:___djgpp_old_timer
2:
pushl %eax
movb $0x20,%al /* EOI the interrupt */
outb %al,$0x020
popl %eax
iret
/* On entry ES is the DS alias selector */
.balign 16,,7
.global ___djgpp_cbrk_hdlr /* A RMCB handler for 0x1b */
___djgpp_cbrk_hdlr:
cld
lodsl /* EAX = DS:[esi] CS:IP */
movl %eax, %es:0x2a(%edi) /* store in structure */
lodsl /* AX = FLAGS */
movw %ax, %es:0x20(%edi)
addw $6, %es:0x2e(%edi) /* Adjust RM SP */
movb $0x1b,%al
.byte 0x2e /* CS: */
testb $2, ___djgpp_hwint_flags /* Count, don't kill */
jne 1f
call ___djgpp_hw_exception
iret
1:
incl %es:___djgpp_cbrk_count
iret
.global ___djgpp_i24 /* Int 24 handler if needed */
.global ___djgpp_iret /* Int 23 handler if needed */
___djgpp_i24:
movb $3,%al
___djgpp_iret:
iret
/* Code to stop execution ASAP, EAX destroyed. Make DS/ES/SS invalid.
Fake exception value is passed in AL and moved into the "forced" variable.
This is used to convert a HW interrupt into something we can transfer
control away from via longjmp or exit(), common with SIGINT, SIGFPE, or
if we want EIP information on timers. */
.balign 16,,7
.global ___djgpp_hw_exception
___djgpp_hw_exception:
.byte 0x2e /* CS: */
cmpl $0, forced /* Already flagged? */
jne already_forced
pushl %ebx
pushl %ecx
pushl %edx
pushl %ds
movw %cs:___djgpp_our_DS, %ds
movl ___djgpp_app_DS, %ebx /* avoid size prefix */
lsl %ebx, %ecx
movl %ecx, ds_limit /* Save current limit */
movb %al, forced /* Indicate a fake exception */
xorl %ecx, %ecx
movw $0xfff, %dx /* 4K limit is null page ! */
movw $0x0008, %ax
int $0x31 /* Set segment limit */
5: popl %ds
popl %edx
popl %ecx
popl %ebx
already_forced:
ret
.global ___djgpp_hw_lock_end
___djgpp_hw_lock_end:
ret /* LD does weird things */