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POGCC 4.7.2 Optimization Problems
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  1. POGCC 4.7.2 Optimization Problems
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    copied!<p><strong>Summary</strong></p> <p>I'm porting ST's USB OTG Library to a custom STM32F4 board using the latest version of Sourcery CodeBench Lite toolchain (GCC arm-none-eabi 4.7.2). </p> <p>When I compile the code with -O0, the program runs fine. When I compile with -O1 or -O2 it fails. When I say fail, it just stops. No hard fault, nothing (Well, obviously there is something it's doing but I don't have a emulator to use to debug and find out, I'm sorry. My hard fault handler is not being called).</p> <p><strong>Details</strong></p> <p>I'm trying to make a call to the following function...</p> <pre><code>void USBD_Init(USB_OTG_CORE_HANDLE *pdev, USB_OTG_CORE_ID_TypeDef coreID, USBD_DEVICE *pDevice, USBD_Class_cb_TypeDef *class_cb, USBD_Usr_cb_TypeDef *usr_cb); </code></pre> <p>...but it doesn't seem to make it into the function body. (Is this a symptom of "stack-smashing"?)</p> <p>The structures passed to this function have the following definitions:</p> <pre><code>typedef struct USB_OTG_handle { USB_OTG_CORE_CFGS cfg; USB_OTG_CORE_REGS regs; DCD_DEV dev; } USB_OTG_CORE_HANDLE , *PUSB_OTG_CORE_HANDLE; typedef enum { USB_OTG_HS_CORE_ID = 0, USB_OTG_FS_CORE_ID = 1 }USB_OTG_CORE_ID_TypeDef; typedef struct _Device_TypeDef { uint8_t *(*GetDeviceDescriptor)( uint8_t speed , uint16_t *length); uint8_t *(*GetLangIDStrDescriptor)( uint8_t speed , uint16_t *length); uint8_t *(*GetManufacturerStrDescriptor)( uint8_t speed , uint16_t *length); uint8_t *(*GetProductStrDescriptor)( uint8_t speed , uint16_t *length); uint8_t *(*GetSerialStrDescriptor)( uint8_t speed , uint16_t *length); uint8_t *(*GetConfigurationStrDescriptor)( uint8_t speed , uint16_t *length); uint8_t *(*GetInterfaceStrDescriptor)( uint8_t speed , uint16_t *length); } USBD_DEVICE, *pUSBD_DEVICE; typedef struct _Device_cb { uint8_t (*Init) (void *pdev , uint8_t cfgidx); uint8_t (*DeInit) (void *pdev , uint8_t cfgidx); /* Control Endpoints*/ uint8_t (*Setup) (void *pdev , USB_SETUP_REQ *req); uint8_t (*EP0_TxSent) (void *pdev ); uint8_t (*EP0_RxReady) (void *pdev ); /* Class Specific Endpoints*/ uint8_t (*DataIn) (void *pdev , uint8_t epnum); uint8_t (*DataOut) (void *pdev , uint8_t epnum); uint8_t (*SOF) (void *pdev); uint8_t (*IsoINIncomplete) (void *pdev); uint8_t (*IsoOUTIncomplete) (void *pdev); uint8_t *(*GetConfigDescriptor)( uint8_t speed , uint16_t *length); uint8_t *(*GetUsrStrDescriptor)( uint8_t speed ,uint8_t index, uint16_t *length); } USBD_Class_cb_TypeDef; typedef struct _USBD_USR_PROP { void (*Init)(void); void (*DeviceReset)(uint8_t speed); void (*DeviceConfigured)(void); void (*DeviceSuspended)(void); void (*DeviceResumed)(void); void (*DeviceConnected)(void); void (*DeviceDisconnected)(void); } USBD_Usr_cb_TypeDef; </code></pre> <p>I've tried to include all the source code relevant to this problem. If you want to see the entire source code you can download it here: <a href="http://www.st.com/st-web-ui/static/active/en/st_prod_software_internet/resource/technical/software/firmware/stm32_f105-07_f2_f4_usb-host-device_lib.zip" rel="noreferrer">http://www.st.com/st-web-ui/static/active/en/st_prod_software_internet/resource/technical/software/firmware/stm32_f105-07_f2_f4_usb-host-device_lib.zip</a></p> <p><strong>Solutions Attempted</strong></p> <p>I tried playing with <code>#pragma GCC optimize ("O0")</code>, <code>__attribute__((optimize("O0")))</code>, and declaring certain definitions as <code>volatile</code>, but nothing worked. I'd rather just modify the code to make it play nicely with the optimizer anyway.</p> <p><strong>Question</strong></p> <p>How can I modify this code to make it play nice with GCC's optimizer?</p>
 

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