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- Fix SPARC Store Doubleword transfer_size in decoder.

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- In the instruction skipper code, add a huge kludge (trampoline) to forcibly
  zero out %global registers when requested. Otherwise, Solaris/SPARC turned
  out to use %g1 during signal handling, and the zero we could have written
  to there vanished. This assumes [%sp-8] is valid to use (ABI states data
  below %sp is undefined though)
This commit is contained in:
gbeauche 2006-01-22 23:14:48 +00:00
parent f8c3b2c6bb
commit 99f5dcf66f
1 changed files with 47 additions and 27 deletions
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74
BasiliskII/src/Unix/sigsegv.cpp
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@ -1354,7 +1354,7 @@ static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, str
break;
case 7: // Store Doubleword
transfer_type = SIGSEGV_TRANSFER_STORE;
transfer_size = SIZE_WORD;
transfer_size = SIZE_LONG;
register_pair = true;
break;
}
@ -1364,33 +1364,7 @@ static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, str
return false;
}
// Zero target register in case of a load operation
const int reg = (opcode >> 25) & 0x1f;
if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
// FIXME: code to handle local & input registers is not tested
if (reg >= 1 && reg <= 7) {
// global registers
regs[reg - 1 + SPARC_REG_G1] = 0;
}
else if (reg >= 8 && reg <= 15) {
// output registers
regs[reg - 8 + SPARC_REG_O0] = 0;
}
else if (reg >= 16 && reg <= 23) {
// local registers (in register windows)
if (gwins)
gwins->wbuf->rw_local[reg - 16] = 0;
else
rwin->rw_local[reg - 16] = 0;
}
else {
// input registers (in register windows)
if (gwins)
gwins->wbuf->rw_in[reg - 24] = 0;
else
rwin->rw_in[reg - 24] = 0;
}
}
#if DEBUG
static const char * reg_names[] = {
@ -1408,6 +1382,52 @@ static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, str
reg_names[reg]);
#endif
// Zero target register in case of a load operation
if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
#if defined(__sun__)
/*
* NOTE: special trampoline code to zero out the target register
* - The code is not reentrant
* - The ABI specifies that data below %sp is undefined, can we
* really write to it in that case?
*/
static unsigned int code[4];
if (sizeof(void *) == 8)
code[0] = 0xc05bbff8|(reg << 25); // ldx [%sp - 8], %reg
else
code[0] = 0xc003bff8|(reg << 25); // ld [%sp - 8], %reg
code[1] = 0x81c00000|(reg << 14); // jmpl %reg
code[2] = 0x80102000|(reg << 25); // clr %reg
*((unsigned long *)regs[SPARC_REG_O0 + 6]) = regs[SPARC_REG_PC] + 4;
regs[SPARC_REG_PC] = (unsigned long)code;
return true;
#else
// FIXME: code to handle local & input registers is not tested
if (reg >= 1 && reg < 8) {
// global registers
regs[reg - 1 + SPARC_REG_G1] = 0;
}
else if (reg >= 8 && reg < 16) {
// output registers
regs[reg - 8 + SPARC_REG_O0] = 0;
}
else if (reg >= 16 && reg < 24) {
// local registers (in register windows)
if (gwins)
gwins->wbuf->rw_local[reg - 16] = 0;
else
rwin->rw_local[reg - 16] = 0;
}
else {
// input registers (in register windows)
if (gwins)
gwins->wbuf->rw_in[reg - 24] = 0;
else
rwin->rw_in[reg - 24] = 0;
}
#endif
}
regs[SPARC_REG_PC] += 4;
return true;
}