diff options
Diffstat (limited to 'contrib/syslinux/latest/com32/gdbstub/int.S')
-rw-r--r-- | contrib/syslinux/latest/com32/gdbstub/int.S | 77 |
1 files changed, 0 insertions, 77 deletions
diff --git a/contrib/syslinux/latest/com32/gdbstub/int.S b/contrib/syslinux/latest/com32/gdbstub/int.S deleted file mode 100644 index 2a1ff9d..0000000 --- a/contrib/syslinux/latest/com32/gdbstub/int.S +++ /dev/null @@ -1,77 +0,0 @@ - .section ".text","ax" - -#define SIGTRAP 5 - -#define SIZEOF_I386_REGS 32 -#define SIZEOF_I386_FLAGS 4 - -/* When invoked, the stack contains: eflags, cs, eip, signo. */ -#define IH_OFFSET_GDB_REGS ( 0 ) -#define IH_OFFSET_GDB_EIP ( IH_OFFSET_GDB_REGS + SIZEOF_I386_REGS ) -#define IH_OFFSET_GDB_EFLAGS ( IH_OFFSET_GDB_EIP + 4 ) -#define IH_OFFSET_GDB_SEG_REGS ( IH_OFFSET_GDB_EFLAGS + SIZEOF_I386_FLAGS ) -#define IH_OFFSET_GDB_END ( IH_OFFSET_GDB_SEG_REGS + 6 * 4 ) -#define IH_OFFSET_OLD_EIP ( IH_OFFSET_GDB_END ) -#define IH_OFFSET_OLD_CS ( IH_OFFSET_OLD_EIP + 4 ) -#define IH_OFFSET_OLD_EFLAGS ( IH_OFFSET_OLD_CS + 4 ) -#define IH_OFFSET_END ( IH_OFFSET_OLD_EFLAGS + 4 ) - -/* We also access the stack whilst still storing or restoring - * the register snapshot. Since ESP is in flux, we need - * special offsets. - */ -#define IH_OFFSET_FLUX_OLD_CS ( IH_OFFSET_OLD_CS - 44 ) -#define IH_OFFSET_FLUX_OLD_EFLAGS ( IH_OFFSET_OLD_EFLAGS - 40 ) -#define IH_OFFSET_FLUX_OLD_EIP ( IH_OFFSET_OLD_EIP - 36 ) -#define IH_OFFSET_FLUX_END ( IH_OFFSET_END - 20 ) - - .global int_handler -int_handler: - /* Store CPU state in GDB register snapshot */ - pushw $0 - pushw %gs - pushw $0 - pushw %fs - pushw $0 - pushw %es - pushw $0 - pushw %ds - pushw $0 - pushw %ss - pushw $0 - pushw IH_OFFSET_FLUX_OLD_CS + 2(%esp) - pushl IH_OFFSET_FLUX_OLD_EFLAGS(%esp) - pushl IH_OFFSET_FLUX_OLD_EIP(%esp) - pushl %edi - pushl %esi - pushl %ebp - leal IH_OFFSET_FLUX_END(%esp), %edi - pushl %edi /* old ESP */ - pushl %ebx - pushl %edx - pushl %ecx - pushl %eax - - /* Call GDB stub exception handler */ - movl $SIGTRAP, %eax - movl %esp, %edx - call gdbstub_handler - - /* Restore CPU state from GDB register snapshot */ - popl %eax - popl %ecx - popl %edx - popl %ebx - addl $4, %esp /* Changing ESP currently not supported */ - popl %ebp - popl %esi - popl %edi - popl IH_OFFSET_FLUX_OLD_EIP(%esp) - popl IH_OFFSET_FLUX_OLD_EFLAGS(%esp) - popl IH_OFFSET_FLUX_OLD_CS(%esp) - popl %ss - popl %ds - popl %es - popl %fs - popl %gs - iret |