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| -rw-r--r-- | asmdiff.ps1 | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/asmdiff.ps1 b/asmdiff.ps1 new file mode 100644 index 000000000..169f14776 --- /dev/null +++ b/asmdiff.ps1 @@ -0,0 +1,114 @@ +Param +( + [Parameter(Position = 0)] + [string]$Start, + + [Parameter(Position = 1)] + [string]$Offset, + + [Parameter()] + [string[]]$DiffTool +) + +$ErrorActionPreference = "Stop" + +$offset_default_value = "0x100" +$diff_tool_default_value = "diff" + +$help = " +$($args[0]) [OPTIONS] Start [Offset] + +Performs a diff on the assembly of a function in a rom. 'Start' is the start +location of the function, and 'Offset' is the number of bytes to disassemble. +The assembly is saved to *.dump files. + +'Offset' is optional, and defaults to $offset_default_value. If this value is +very large (0x10000+), objdump may hang / freeze. + +Requirements: + - A clean copy of the rom named 'baserom.gba'. + - $$ENV:DEVKITARM to point to the installation of devkitpro. By default, it is + installed to 'C:\devkitpro\devkitARM'. + +Options: + -DiffTool <tool> The tool to use for diffing. Defaults to '$diff_tool_default_value'. For VSCode, + you can use -DiffTool 'code --diff'. (Quotes are necessary around 'code --diff') +" + +if ((-not (Test-Path variable:Start)) -or [string]::IsNullOrWhiteSpace($Start)) +{ + Write-Host $help + exit +} + +if (-not (Test-Path variable:DiffTool) -or [string]::IsNullOrWhiteSpace($DiffTool)) +{ + $DiffTool = $diff_tool_default_value +} + +if (-not (Test-Path variable:Offset) -or [string]::IsNullOrWhiteSpace($Offset)) +{ + $Offset = $offset_default_value +} + +if (-Not (Test-Path env:DEVKITARM)) +{ + Write-Host "ENV:DEVKITARM variable not set." + Write-Host $help + exit +} + +if (-Not (Test-Path $env:DEVKITARM)) +{ + Write-Host "DEVKITARM path '$env:DEVKITARM' does not exist." + Write-Host $help + exit +} + +if (-Not (Test-Path ".\pokeemerald.gba")) +{ + Write-Host "File 'pokeemerald.gba' not found." + Write-Host $help + exit +} + +if (-Not (Test-Path ".\baserom.gba")) +{ + Write-Host "File 'baserom.gba' not found." +} + +try +{ + $start_num = [System.Convert]::ToUInt64($Start, 16) +} +catch +{ + Write-Host "Error parsing '$start_num' as a hex number." + Write-Host $help + exit +} + +try +{ + $offset_num = [System.Convert]::ToUInt64($Offset, 16) +} +catch +{ + Write-Host "Error parsing '$offset_num' as a hex number." + Write-Host $help + exit +} + +if ($start_num -gt 0x1000000) +{ + Write-Host "Warning: Start address is larger than the ROM file. Hint: ignore the leading number in the address." +} + +$end_str = [System.Convert]::ToString($start_num + $offset_num, 16) +$end_str = "0x$end_str" + +Write-Host "$Start - $end_str" +$objdump = Join-Path -Path $env:DEVKITARM -ChildPath "arm-none-eabi\bin\objdump.exe" +&$objdump -D -bbinary -marmv4t -Mforce-thumb --start-address="$Start" --stop-address="$end_str" .\baserom.gba > .\baserom.dump +&$objdump -D -bbinary -marmv4t -Mforce-thumb --start-address="$Start" --stop-address="$end_str" .\pokeemerald.gba > .\pokeemerald.dump +Invoke-Expression "$DiffTool .\baserom.dump .\pokeemerald.dump" |