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https://github.com/autc04/Retro68.git
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relocate.c: reduce reliance on the FLT header (it has to go)
This commit is contained in:
Wolfgang Thaller
parent
278780642e
commit
5059b87fe4
@ -26,10 +26,9 @@ ENTRY( _start )
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SECTIONS
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{
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.text : {
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*/libretrocrt.a:*(.text*)
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*/foo.o(.text*)
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*(.text*)
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_stext = . ;
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*/libretrocrt.a:*(.text*)
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*(.text*)
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*(.stub)
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*(.gnu.linkonce.t*)
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@ -43,15 +42,15 @@ SECTIONS
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__fini_section = . ;
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KEEP (*(.fini))
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__fini_section_end = . ;
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_etext = . ;
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*(.eh_frame_hdr)
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KEEP(*(.eh_frame))
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KEEP(*(.gcc_except_table))
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KEEP(*(.gcc_except_table.*))
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. = ALIGN(0x4) ;
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_etext = . ;
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}
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.data : {
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. = ALIGN(0x4) ;
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_sdata = . ;
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*(.got.plt)
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*(.got)
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@ -92,10 +91,11 @@ SECTIONS
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KEEP (*(.dtors))
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*(.tm_clone_table)
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. = ALIGN(0x4);
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_edata = . ;
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}
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.bss : {
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_sbss = ALIGN(0x4) ;
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__bss_start = . ;
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.bss ALIGN(0x4) : {
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_sbss = .;
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*(.dynsbss)
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*(.sbss)
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*(.sbss.*)
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@ -66,16 +66,18 @@ extern void __fini_section_end(void);
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typedef struct Retro68RelocState
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{
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long headerVirtualAddress;
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Ptr bssPtr;
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Handle codeHandle;
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} Retro68RelocState;
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extern uint8_t _stext, _etext, _sdata, _edata, _sbss, _ebss;
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static Retro68RelocState relocState __attribute__ ((nocommon)) = {
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-sizeof(struct flat_hdr), NULL, NULL
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static Retro68RelocState relocState __attribute__ ((nocommon, section(".text"))) = {
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NULL, NULL
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};
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#if 1
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/* a simple version of assert - on failure, the line number is output
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* using DebugStr. */
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#if 0
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#define assert(x) do { } while(0)
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#else
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#define assert(x) do { \
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@ -97,6 +99,43 @@ static Retro68RelocState relocState __attribute__ ((nocommon)) = {
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} while(0)
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#endif
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#if 0
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#define log(x) do { } while(0)
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#else
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#define log(x) do { \
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{\
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unsigned char str[10]; \
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int ___i; \
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unsigned l = (x); \
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for(___i = 2; ___i < 10; ___i++) \
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str[___i] = ' '; \
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str[0] = 9; \
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str[1] = 'L'; \
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str[9] = '0'; \
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for(___i = 8; l && ___i > 1; ___i--) \
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{ \
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str[___i] = '0' + (l & 0xF); \
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if((l & 0xF) >= 0xA) \
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str[___i] = 'A' - 10 + (l&0xF); \
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l >>= 4; \
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} \
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DebugStr(str); \
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} \
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} while(0)
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#endif
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#define GET_VIRTUAL_ADDRESS(NAME, SYM) \
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do { \
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__asm__( "\tlea " #SYM ", %0\n" \
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: "=a"(NAME) ); \
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if(hasStripAddr) \
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NAME = StripAddress(NAME); \
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else \
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NAME = StripAddress24(NAME); \
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} while(0)
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void Retro68Relocate()
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{
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// memory address to retrieve the ROM type (64K or a later ROM)
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@ -144,16 +183,31 @@ void Retro68Relocate()
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// that are invoked more than once.
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// Lock the code to be sure.
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if(rState->codeHandle)
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HLock(rState->codeHandle);
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return;
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}
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}
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// Locate the start of the FLT file header inside the code resource
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long headerOldVirtualAddress = rState->headerVirtualAddress;
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struct flat_hdr *header = (struct flat_hdr*) (headerOldVirtualAddress + displacement);
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uint8_t *base = (uint8_t*) (header+1);
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uint8_t *orig_stext, *orig_etext, *orig_sdata, *orig_edata, *orig_sbss, *orig_ebss;
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GET_VIRTUAL_ADDRESS(orig_stext, _stext);
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GET_VIRTUAL_ADDRESS(orig_etext, _etext);
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GET_VIRTUAL_ADDRESS(orig_sdata, _sdata);
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GET_VIRTUAL_ADDRESS(orig_edata, _edata);
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GET_VIRTUAL_ADDRESS(orig_sbss, _sbss);
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GET_VIRTUAL_ADDRESS(orig_ebss, _ebss);
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log(orig_stext);
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log(orig_etext);
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log(orig_sdata);
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log(orig_edata);
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log(orig_sbss);
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log(orig_ebss);
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uint8_t *base = (uint8_t*) (orig_stext + displacement);
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struct flat_hdr *header = ((struct flat_hdr*) (orig_stext + displacement)) - 1;
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// Recover the handle to the code resource by looking at the
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// longword before the FLT header. The resource templates in Retro68.r store the offset
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// from the beginning of the code resource there.
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@ -172,46 +226,61 @@ void Retro68Relocate()
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}
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}
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long bss_size = header->bss_end - header->data_end;
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long bss_size = &_ebss - &_sbss;
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long n = header->reloc_count;
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long *relocs = (long*)( (char*)header + header->reloc_start );
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long i;
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long data_end = header->data_end + headerOldVirtualAddress;
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uint32_t flt_size = (uint32_t) header->data_end;
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uint32_t text_and_data_size = orig_edata - orig_stext;
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uint32_t total_size = orig_ebss - orig_stext; // FIXME: not true for repeated reloc
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long bss_displacement = 0;
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assert(text_and_data_size == header->data_end - sizeof(*header));
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assert((uint8_t*)relocs == base + text_and_data_size);
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assert(total_size == header->bss_end - sizeof(*header));
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// Allocate BSS section (uninitialized/zero-initialized global data)
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if(!rState->bssPtr)
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{
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THz zone = ApplicationZone();
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if(!zone || (char*)header < (char*)zone)
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if(!zone || (uint8_t*)header < (uint8_t*)zone)
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rState->bssPtr = NewPtrSysClear(bss_size);
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else
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rState->bssPtr = NewPtrClear(bss_size);
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bss_displacement = (long)(rState->bssPtr) - data_end;
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bss_displacement = (uint8_t*)rState->bssPtr - &_sbss;
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}
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// Process relocation records
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for(i = 0; i < n; i++)
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{
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//Debugger();
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uint8_t *addrPtr = base + relocs[i];
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uint32_t addr;
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assert((Ptr)addrPtr >= (Ptr)header);
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assert((Ptr)addrPtr < (Ptr)header + flt_size);
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/*log(relocs + i);
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log(relocs[i]);*/
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assert((Ptr)addrPtr >= (Ptr)base);
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assert((Ptr)addrPtr < (Ptr)base + text_and_data_size);
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//addr = *(uint32_t*)addrPtr;
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addr = (((((addrPtr[0] << 8) | addrPtr[1]) << 8) | addrPtr[2]) << 8) | addrPtr[3];
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assert(addr + 0x40 >= headerOldVirtualAddress + 0x40);
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assert(addr + 0x40 < headerOldVirtualAddress + header->bss_end + 0x40);
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//log(addr);
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addr += (uint32_t)(addr - headerOldVirtualAddress) >= flt_size ?
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/* Check whether addresses are in range.
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* This doesn't seem to work because exception handling tables
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* seem to contain strange things.
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*/
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/*assert((uint8_t*)addr >= orig_stext); // TODO: not right for repeated reloc
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assert((uint8_t*)addr <= orig_stext + total_size);*/
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addr += (addr - (uint32_t)orig_stext) >= text_and_data_size ?
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bss_displacement : displacement;
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assert((Ptr)addr >= (Ptr)header && (Ptr)addr < (Ptr)header + flt_size
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|| (Ptr)addr >= rState->bssPtr && (Ptr)addr < rState->bssPtr + bss_size);
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/*assert((Ptr)addr >= (Ptr)base && (Ptr)addr <= (Ptr)base + text_and_data_size
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|| (Ptr)addr >= rState->bssPtr && (Ptr)addr <= rState->bssPtr + bss_size);*/
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addrPtr[3] = addr;
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addrPtr[2] = (addr >>= 8);
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@ -238,7 +307,6 @@ void Retro68Relocate()
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}
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// accessing globals and calling functions is OK below here.
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rState->headerVirtualAddress += displacement;
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}
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void Retro68CallConstructors()
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