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34 lines
1.6 KiB
C
34 lines
1.6 KiB
C
// uefi_textout.c : prints some text on the screen.
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//
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// (c) Ulf Frisk, 2017
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// Author: Ulf Frisk, pcileech@frizk.net
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//
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// compile with:
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// cl.exe /O1 /Os /Oy /FD /MT /GS- /J /GR- /FAcs /W4 /Zl /c /TC /kernel uefi_common.c
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// cl.exe /O1 /Os /Oy /FD /MT /GS- /J /GR- /FAcs /W4 /Zl /c /TC /kernel uefi_textout.c
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// ml64.exe uefi_common_a.asm /Feuefi_textout.exe /link /NODEFAULTLIB /RELEASE /MACHINE:X64 /entry:main uefi_textout.obj uefi_common.obj
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// shellcode64.exe -o uefi_textout.exe "UEFI TEST PROGRAM - PRINT STUFF ON THE SCREEN\n===========================================================\nSyntax: pcileech.exe -s <text_to_print>\nGENERAL INFORMATION BELOW:\n TEXT : %s\n"
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//
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#include "uefi_common.h"
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VOID c_EntryPoint(PKMDDATA pk)
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{
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WCHAR szPrint[MAX_PATH];
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CHAR *szSrc, szPrintDefault[] = { ' ', ' ', ' ', 'U', 'E', 'F', 'I', ' ', 'E', 'V', 'I', 'L', ' ', 'I', 'N', ' ', 'B', 'O', 'O', 'T', ' ', 'S', 'E', 'R', 'V', 'I', 'C', 'E', 'S', '!', ' ', ' ', ' ', 0 };
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EFI_GUID GUID_EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL = EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_GUID;
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EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL oOut;
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EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *pOut = &oOut;
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QWORD i, efi_status;
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szSrc = pk->dataInStr[0] ? pk->dataInStr : szPrintDefault;
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for(i = 0; i < MAX_PATH - 1; i++) {
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// read overflow here if default, but doesn't matter...
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szPrint[i] = szSrc[i];
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pk->dataOutStr[i] = szSrc[i];
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}
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pk->dataOut[0] = efi_status = LocateProtocol(&GUID_EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL, NULL, (QWORD**)&pOut);
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if(!efi_status) {
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pOut->SetAttribute((QWORD*)pOut, EFI_BACKGROUND_RED | EFI_CYAN);
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pOut->OutputString((QWORD*)pOut, szPrint);
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}
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}
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