Start Length Name Class
0001:00000000 000012f7H .text$mn CODE
0002:00000000 000006f4H .rdata DATA
0002:000006f4 00000110H .rdata$zzzdbg DATA
0003:00000000 00000020H .data DATA
0003:00000020 00000020H .bss DATA
0004:00000000 000000a8H .pdata DATA
0005:00000000 00000084H .xdata DATA
/**
Internal function that convert a number to a string in Buffer.
Print worker function that converts a decimal or hexadecimal number to an ASCII string in Buffer.
@param Buffer Location to place the ASCII string of Value.
@param Value The value to convert to a Decimal or Hexadecimal string in Buffer.
@param Radix Radix of the value
@return A pointer to the end of buffer filled with ASCII string.
**/
CHAR8 *
BasePrintLibValueToString (
IN OUT CHAR8 *Buffer,
IN INT64 Value,
IN UINTN Radix
)
{
UINT32 Remainder;
//
// Loop to convert one digit at a time in reverse order
//
*Buffer = 0;
do {
Value = (INT64)DivU64x32Remainder ((UINT64)Value, (UINT32)Radix, &Remainder);
*(++Buffer) = mHexStr[Remainder];
} while (Value != 0);
//
// Return pointer of the end of filled buffer.
//
return Buffer;
}
; reserve space for 2 arguments
sub rsp, 2 * 8
; rdx points to the EFI_SYSTEM_TABLE structure
; which is the 2nd argument passed to us by the UEFI firmware
; adding 64 causes rcx to point to EFI_SYSTEM_TABLE.ConOut
mov rcx, [rdx + 64]
; load the address of our string into rdx
lea rdx, [rel strHello]
; EFI_SYSTEM_TABLE.ConOut points to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
; call OutputString on the value in rdx
call [rcx + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.OutputString]
||0:6: kd> !rsdt
Sorry: Unable to get ACPI!AcpiInformation.
Searching for RSDP.*************************************************************************
*** ***
*** ***
*** Either you specified an unqualified symbol, or your debugger ***
*** doesn't have full symbol information. Unqualified symbol ***
*** resolution is turned off by default. Please either specify a ***
*** fully qualified symbol module!symbolname, or enable resolution ***
*** of unqualified symbols by typing ".symopt- 100". Note that ***
*** enabling unqualified symbol resolution with network symbol ***
*** server shares in the symbol path may cause the debugger to ***
*** appear to hang for long periods of time when an incorrect ***
*** symbol name is typed or the network symbol server is down. ***
*** ***
*** For some commands to work properly, your symbol path ***
*** must point to .pdb files that have full type information. ***
*** ***
*** Certain .pdb files (such as the public OS symbols) do not ***
*** contain the required information. Contact the group that ***
*** provided you with these symbols if you need this command to ***
*** work. ***
*** ***
*** Type referenced: hal!_RSDT_32 ***
*** ***
*************************************************************************
.........................................0x0effe0: Read 0x000020 of 0x000024 bytes
Could not locate the RSDT pointer
; Copyright 2018-2019 Brian Otto @ https://hackerpulp.com
;
; Permission to use, copy, modify, and/or distribute this software for any
; purpose with or without fee is hereby granted, provided that the above
; copyright notice and this permission notice appear in all copies.
;
; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
; REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
; INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
; LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
; OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
; PERFORMANCE OF THIS SOFTWARE.
; generate 64-bit code
bits 64
; contains the code that will run
section .text
; allows the linker to see this symbol
global _start
; see http://www.uefi.org/sites/default/files/resources/UEFI Spec 2_7_A Sept 6.pdf#G8.1001729
struc EFI_TABLE_HEADER
.Signature RESQ 1
.Revision RESD 1
.HeaderSize RESD 1
.CRC32 RESD 1
.Reserved RESD 1
endstruc
; see http://www.uefi.org/sites/default/files/resources/UEFI Spec 2_7_A Sept 6.pdf#G8.1001773
struc EFI_SYSTEM_TABLE
.Hdr RESB EFI_TABLE_HEADER_size
.FirmwareVendor RESQ 1
.FirmwareRevision RESD 1
.ConsoleInHandle RESQ 1
.ConIn RESQ 1
.ConsoleOutHandle RESQ 1
.ConOut RESQ 1
.StandardErrorHandle RESQ 1
.StdErr RESQ 1
.RuntimeServices RESQ 1
.BootServices RESQ 1
.NumberOfTableEntries RESQ 1
.ConfigurationTable RESQ 1
endstruc
; see http://www.uefi.org/sites/default/files/resources/UEFI Spec 2_7_A Sept 6.pdf#G16.1016807
struc EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
.Reset RESQ 1
.OutputString RESQ 1
.TestString RESQ 1
.QueryMode RESQ 1
.SetMode RESQ 1
.SetAttribute RESQ 1
.ClearScreen RESQ 1
.SetCursorPosition RESQ 1
.EnableCursor RESQ 1
.Mode RESQ 1
endstruc
_start:
push rax ;ConOut requires a push here. I don't know why
; reserve space for 4 arguments
sub rsp, 4 * 8
; rdx points to the EFI_SYSTEM_TABLE structure
; which is the 2nd argument passed to us by the UEFI firmware
; adding 64 causes rcx to point to EFI_SYSTEM_TABLE.ConOut
mov rcx, [rdx + 64]
; load the address of our string into rdx
lea rdx, [rel strHello]
; EFI_SYSTEM_TABLE.ConOut points to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
; call OutputString on the value in rdx
call [rcx + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.OutputString]
add rsp, 4 * 8
pop rax
ret
codesize equ $ - $$
; contains nothing - but it is required by UEFI
section .reloc
; contains the data that will be displayed
section .data
; this must be a Unicode string
strHello db __utf16__ `Hello World !\n\r\0`
datasize equ $ - $$
