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/* |
/* |
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* Copyright (C) 2003-2006 Anders Gavare. All rights reserved. |
* Copyright (C) 2003-2007 Anders Gavare. All rights reserved. |
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* |
* |
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* Redistribution and use in source and binary forms, with or without |
* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
* modification, are permitted provided that the following conditions are met: |
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* SUCH DAMAGE. |
* SUCH DAMAGE. |
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* |
* |
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* |
* |
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* $Id: memory_rw.c,v 1.97 2006/09/07 11:44:01 debug Exp $ |
* $Id: memory_rw.c,v 1.101 2007/02/10 14:04:51 debug Exp $ |
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* |
* |
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* Generic memory_rw(), with special hacks for specific CPU families. |
* Generic memory_rw(), with special hacks for specific CPU families. |
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* |
* |
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no_exceptions = misc_flags & NO_EXCEPTIONS; |
no_exceptions = misc_flags & NO_EXCEPTIONS; |
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cache = misc_flags & CACHE_FLAGS_MASK; |
cache = misc_flags & CACHE_FLAGS_MASK; |
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#ifdef MEM_X86 |
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/* Real-mode wrap-around: */ |
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if (REAL_MODE && !(misc_flags & PHYSICAL)) { |
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if ((vaddr & 0xffff) + len > 0x10000) { |
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/* Do one byte at a time: */ |
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int res = 0; |
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size_t i; |
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for (i=0; i<len; i++) |
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res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1, |
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writeflag, misc_flags); |
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return res; |
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} |
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} |
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/* Crossing a page boundary? Then do one byte at a time: */ |
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if ((vaddr & 0xfff) + len > 0x1000 && !(misc_flags & PHYSICAL) |
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&& cpu->cd.x86.cr[0] & X86_CR0_PG) { |
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/* |
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* For WRITES: Read ALL BYTES FIRST and write them back!!! |
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* Then do a write of all the new bytes. This is to make sure |
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* than both pages around the boundary are writable so that |
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* there is no "partial write" performed. |
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*/ |
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int res = 0; |
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size_t i; |
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if (writeflag == MEM_WRITE) { |
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unsigned char tmp; |
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for (i=0; i<len; i++) { |
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res = MEMORY_RW(cpu, mem, vaddr+i, &tmp, 1, |
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MEM_READ, misc_flags); |
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if (!res) |
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return 0; |
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res = MEMORY_RW(cpu, mem, vaddr+i, &tmp, 1, |
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MEM_WRITE, misc_flags); |
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if (!res) |
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return 0; |
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} |
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for (i=0; i<len; i++) { |
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res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1, |
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MEM_WRITE, misc_flags); |
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if (!res) |
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return 0; |
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} |
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} else { |
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for (i=0; i<len; i++) { |
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/* Do one byte at a time: */ |
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res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1, |
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writeflag, misc_flags); |
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if (!res) { |
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if (cache == CACHE_INSTRUCTION) { |
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fatal("FAILED instruction " |
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"fetch across page boundar" |
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"y: todo. vaddr=0x%08x\n", |
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(int)vaddr); |
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cpu->running = 0; |
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} |
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return 0; |
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} |
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} |
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} |
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return res; |
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} |
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#endif /* X86 */ |
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#ifdef MEM_USERLAND |
#ifdef MEM_USERLAND |
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#ifdef MEM_ALPHA |
#ifdef MEM_ALPHA |
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ok = cpu->translate_v2p(cpu, vaddr, &paddr, |
ok = cpu->translate_v2p(cpu, vaddr, &paddr, |
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(writeflag? FLAG_WRITEFLAG : 0) + |
(writeflag? FLAG_WRITEFLAG : 0) + |
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(no_exceptions? FLAG_NOEXCEPTIONS : 0) |
(no_exceptions? FLAG_NOEXCEPTIONS : 0) |
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#ifdef MEM_X86 |
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+ (misc_flags & NO_SEGMENTATION) |
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#endif |
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#ifdef MEM_ARM |
#ifdef MEM_ARM |
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+ (misc_flags & MEMORY_USER_ACCESS) |
+ (misc_flags & MEMORY_USER_ACCESS) |
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#endif |
#endif |
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return MEMORY_ACCESS_FAILED; |
return MEMORY_ACCESS_FAILED; |
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} |
} |
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#ifdef MEM_X86 |
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/* DOS debugging :-) */ |
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if (!quiet_mode && !(misc_flags & PHYSICAL)) { |
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if (paddr >= 0x400 && paddr <= 0x4ff) |
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debug("{ PC BIOS DATA AREA: %s 0x%x }\n", writeflag == |
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MEM_WRITE? "writing to" : "reading from", |
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(int)paddr); |
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#if 0 |
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if (paddr >= 0xf0000 && paddr <= 0xfffff) |
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debug("{ BIOS ACCESS: %s 0x%x }\n", |
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writeflag == MEM_WRITE? "writing to" : |
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"reading from", (int)paddr); |
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#endif |
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} |
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#endif |
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#endif /* !MEM_USERLAND */ |
#endif /* !MEM_USERLAND */ |
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uint64_t orig_paddr = paddr; |
uint64_t orig_paddr = paddr; |
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int i, start, end, res; |
int i, start, end, res; |
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#if 0 |
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TODO: The correct solution for this is to add RAM devices _around_ the |
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dangerous device. The solution below incurs a slowdown for _everything_, |
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not just the device in question. |
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/* |
/* |
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* Really really slow, but unfortunately necessary. This is |
* Really really slow, but unfortunately necessary. This is |
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* to avoid the folowing scenario: |
* to avoid the folowing scenario: |
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* TODO: Convert this into a quick (multi-level, 64-bit) |
* TODO: Convert this into a quick (multi-level, 64-bit) |
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* address space lookup, to find dangerous pages. |
* address space lookup, to find dangerous pages. |
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*/ |
*/ |
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#if 1 |
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for (i=0; i<mem->n_mmapped_devices; i++) |
for (i=0; i<mem->n_mmapped_devices; i++) |
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if (paddr >= (mem->devices[i].baseaddr & ~offset_mask)&& |
if (paddr >= (mem->devices[i].baseaddr & ~offset_mask)&& |
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paddr <= ((mem->devices[i].endaddr-1)|offset_mask)){ |
paddr <= ((mem->devices[i].endaddr-1)|offset_mask)){ |
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if (res == 0) |
if (res == 0) |
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res = -1; |
res = -1; |
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#ifndef MEM_X86 |
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/* |
/* |
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* If accessing the memory mapped device |
* If accessing the memory mapped device |
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* failed, then return with a DBE exception. |
* failed, then return with a DBE exception. |
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#endif |
#endif |
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return MEMORY_ACCESS_FAILED; |
return MEMORY_ACCESS_FAILED; |
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} |
} |
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#endif |
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goto do_return_ok; |
goto do_return_ok; |
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} |
} |
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} else |
} else |
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#endif /* MIPS */ |
#endif /* MIPS */ |
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{ |
{ |
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if (paddr >= mem->physical_max) { |
if (paddr >= mem->physical_max && !no_exceptions) |
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uint64_t offset, old_pc = cpu->pc; |
memory_warn_about_unimplemented_addr |
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char *symbol; |
(cpu, mem, writeflag, paddr, data, len); |
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/* This allows for example OS kernels to probe |
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memory a few KBs past the end of memory, |
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without giving too many warnings. */ |
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if (!quiet_mode && !no_exceptions && paddr >= |
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mem->physical_max + 0x40000) { |
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fatal("[ memory_rw(): writeflag=%i ", |
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writeflag); |
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if (writeflag) { |
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unsigned int i; |
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debug("data={", writeflag); |
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if (len > 16) { |
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int start2 = len-16; |
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for (i=0; i<16; i++) |
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debug("%s%02x", |
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i?",":"", |
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data[i]); |
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debug(" .. "); |
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if (start2 < 16) |
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start2 = 16; |
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for (i=start2; i<len; |
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i++) |
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debug("%s%02x", |
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i?",":"", |
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data[i]); |
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} else |
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for (i=0; i<len; i++) |
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debug("%s%02x", |
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i?",":"", |
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data[i]); |
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debug("}"); |
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} |
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fatal(" paddr=0x%llx >= physical_max" |
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"; pc=", (long long)paddr); |
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if (cpu->is_32bit) |
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fatal("0x%08x",(int)old_pc); |
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else |
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fatal("0x%016llx", |
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(long long)old_pc); |
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symbol = get_symbol_name( |
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&cpu->machine->symbol_context, |
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old_pc, &offset); |
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fatal(" <%s> ]\n", |
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symbol? symbol : " no symbol "); |
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} |
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} |
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if (writeflag == MEM_READ) { |
if (writeflag == MEM_READ) { |
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#ifdef MEM_X86 |
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/* Reading non-existant memory on x86: */ |
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memset(data, 0xff, len); |
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#else |
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/* Return all zeroes? (Or 0xff? TODO) */ |
/* Return all zeroes? (Or 0xff? TODO) */ |
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memset(data, 0, len); |
memset(data, 0, len); |
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#endif |
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#ifdef MEM_MIPS |
#ifdef MEM_MIPS |
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/* |
/* |