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Implement "ignoresegv" feature on Darwin/ppc (tested on MacOS X)

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- Unix/sigsegv.cpp (powerpc_decode_instruction): New.
  (get_fault_instruction [MacOS X]): Factorize code.
  (get_fault_instruction [Linux/m68k]): Don't use expression statement.
- README (ignoresegv): Add Darwin/ppc to list of supported platforms.
This commit is contained in:
gbeauche 2002-05-20 15:56:13 +00:00
parent c47819020c
commit e81b9ace6d
2 changed files with 215 additions and 266 deletions
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2
BasiliskII/README
View File

@ -578,7 +578,7 @@ Unix:
Set this to "true" to ignore illegal memory accesses. The default
is "false". This feature is only implemented on the following
platforms: Linux/x86, Linux/ppc.
platforms: Linux/x86, Linux/ppc, Darwin/ppc.
AmigaOS:

479
BasiliskII/src/Unix/sigsegv.cpp
View File

@ -53,6 +53,155 @@ static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
static bool sigsegv_do_install_handler(int sig);
/*
* Instruction decoding aids
*/
// Transfer type
enum transfer_type_t {
TYPE_UNKNOWN,
TYPE_LOAD,
TYPE_STORE
};
// Transfer size
enum transfer_size_t {
SIZE_UNKNOWN,
SIZE_BYTE,
SIZE_WORD,
SIZE_LONG
};
#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
// Addressing mode
enum addressing_mode_t {
MODE_UNKNOWN,
MODE_NORM,
MODE_U,
MODE_X,
MODE_UX
};
// Decoded instruction
struct instruction_t {
transfer_type_t transfer_type;
transfer_size_t transfer_size;
addressing_mode_t addr_mode;
unsigned int addr;
char ra, rd;
};
static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned int * gpr)
{
// Get opcode and divide into fields
unsigned int opcode = *((unsigned int *)nip);
unsigned int primop = opcode >> 26;
unsigned int exop = (opcode >> 1) & 0x3ff;
unsigned int ra = (opcode >> 16) & 0x1f;
unsigned int rb = (opcode >> 11) & 0x1f;
unsigned int rd = (opcode >> 21) & 0x1f;
signed int imm = (signed short)(opcode & 0xffff);
// Analyze opcode
transfer_type_t transfer_type = TYPE_UNKNOWN;
transfer_size_t transfer_size = SIZE_UNKNOWN;
addressing_mode_t addr_mode = MODE_UNKNOWN;
switch (primop) {
case 31:
switch (exop) {
case 23: // lwzx
transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
case 55: // lwzux
transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
case 87: // lbzx
transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
case 119: // lbzux
transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
case 151: // stwx
transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
case 183: // stwux
transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
case 215: // stbx
transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
case 247: // stbux
transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
case 279: // lhzx
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
case 311: // lhzux
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
case 343: // lhax
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
case 375: // lhaux
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
case 407: // sthx
transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
case 439: // sthux
transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
}
break;
case 32: // lwz
transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
case 33: // lwzu
transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
case 34: // lbz
transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
case 35: // lbzu
transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
case 36: // stw
transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
case 37: // stwu
transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
case 38: // stb
transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
case 39: // stbu
transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
case 40: // lhz
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
case 41: // lhzu
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
case 42: // lha
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
case 43: // lhau
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
case 44: // sth
transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
case 45: // sthu
transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
}
// Calculate effective address
unsigned int addr = 0;
switch (addr_mode) {
case MODE_X:
case MODE_UX:
if (ra == 0)
addr = gpr[rb];
else
addr = gpr[ra] + gpr[rb];
break;
case MODE_NORM:
case MODE_U:
if (ra == 0)
addr = (signed int)(signed short)imm;
else
addr = gpr[ra] + (signed int)(signed short)imm;
break;
default:
break;
}
// Commit decoded instruction
instruction->addr = addr;
instruction->addr_mode = addr_mode;
instruction->transfer_type = transfer_type;
instruction->transfer_size = transfer_size;
instruction->ra = ra;
instruction->rd = rd;
}
#endif
/*
* OS-dependant SIGSEGV signals support section
*/
@ -69,8 +218,9 @@ static bool sigsegv_do_install_handler(int sig);
#if defined(__linux__)
#if (defined(i386) || defined(__i386__))
#include <sys/ucontext.h>
#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
#define SIGSEGV_REGISTER_FILE (unsigned long *)(((ucontext_t *)scp)->uc_mcontext.gregs)
#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
#define SIGSEGV_REGISTER_FILE (unsigned int *)SIGSEGV_CONTEXT_REGS
#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
#endif
#if (defined(ia64) || defined(__ia64__))
@ -78,8 +228,9 @@ static bool sigsegv_do_install_handler(int sig);
#endif
#if (defined(powerpc) || defined(__powerpc__))
#include <sys/ucontext.h>
#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t *)scp)->uc_mcontext.regs->nip)
#define SIGSEGV_REGISTER_FILE (unsigned long *)(((ucontext_t *)scp)->uc_mcontext.regs)
#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.regs)
#define SIGSEGV_FAULT_INSTRUCTION (SIGSEGV_CONTEXT_REGS->nip)
#define SIGSEGV_REGISTER_FILE (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
#endif
#endif
@ -107,7 +258,7 @@ static bool sigsegv_do_install_handler(int sig);
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp
#define SIGSEGV_FAULT_ADDRESS scp->regs->dar
#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip
#define SIGSEGV_REGISTER_FILE (unsigned long *)(scp->regs)
#define SIGSEGV_REGISTER_FILE (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
#endif
#if (defined(alpha) || defined(__alpha__))
@ -162,25 +313,29 @@ static sigsegv_address_t get_fault_address(struct sigcontext *scp)
#if (defined(m68k) || defined(__m68k__))
#include <m68k/frame.h>
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
#define SIGSEGV_FAULT_ADDRESS ({ \
struct sigstate { \
int ss_flags; \
struct frame ss_frame; \
}; \
struct sigstate *state = (struct sigstate *)scp->sc_ap; \
char *fault_addr; \
switch (state->ss_frame.f_format) { \
case 7: /* 68040 access error */ \
/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */ \
fault_addr = state->ss_frame.f_fmt7.f_fa; \
break; \
default: \
fault_addr = (char *)code; \
break; \
} \
fault_addr; \
})
#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
// Use decoding scheme from BasiliskII/m68k native
static sigsegv_address_t get_fault_address(struct sigcontext *scp)
{
struct sigstate {
int ss_flags;
struct frame ss_frame;
};
struct sigstate *state = (struct sigstate *)scp->sc_ap;
char *fault_addr;
switch (state->ss_frame.f_format) {
case 7: /* 68040 access error */
/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
fault_addr = state->ss_frame.f_fmt7.f_fa;
break;
default:
fault_addr = (char *)code;
break;
}
return (sigsegv_address_t)fault_addr;
}
#else
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, void *scp, char *addr
#define SIGSEGV_FAULT_ADDRESS addr
@ -195,108 +350,28 @@ static sigsegv_address_t get_fault_address(struct sigcontext *scp)
#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
#define SIGSEGV_REGISTER_FILE (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
// From Boehm's GC 6.0alpha8
#define EXTRACT_OP1(iw) (((iw) & 0xFC000000) >> 26)
#define EXTRACT_OP2(iw) (((iw) & 0x000007FE) >> 1)
#define EXTRACT_REGA(iw) (((iw) & 0x001F0000) >> 16)
#define EXTRACT_REGB(iw) (((iw) & 0x03E00000) >> 21)
#define EXTRACT_REGC(iw) (((iw) & 0x0000F800) >> 11)
#define EXTRACT_DISP(iw) ((short *) &(iw))[1]
// Use decoding scheme from SheepShaver
static sigsegv_address_t get_fault_address(struct sigcontext *scp)
{
unsigned int instr = *((unsigned int *) scp->sc_ir);
unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
int disp = 0, tmp;
unsigned int baseA = 0, baseB = 0;
unsigned int addr, alignmask = 0xFFFFFFFF;
unsigned int nip = (unsigned int) scp->sc_ir;
unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
instruction_t instr;
switch(EXTRACT_OP1(instr)) {
case 38: /* stb */
case 39: /* stbu */
case 54: /* stfd */
case 55: /* stfdu */
case 52: /* stfs */
case 53: /* stfsu */
case 44: /* sth */
case 45: /* sthu */
case 47: /* stmw */
case 36: /* stw */
case 37: /* stwu */
tmp = EXTRACT_REGA(instr);
if(tmp > 0)
baseA = regs[tmp];
disp = EXTRACT_DISP(instr);
break;
case 31:
switch(EXTRACT_OP2(instr)) {
case 86: /* dcbf */
case 54: /* dcbst */
case 1014: /* dcbz */
case 247: /* stbux */
case 215: /* stbx */
case 759: /* stfdux */
case 727: /* stfdx */
case 983: /* stfiwx */
case 695: /* stfsux */
case 663: /* stfsx */
case 918: /* sthbrx */
case 439: /* sthux */
case 407: /* sthx */
case 661: /* stswx */
case 662: /* stwbrx */
case 150: /* stwcx. */
case 183: /* stwux */
case 151: /* stwx */
case 135: /* stvebx */
case 167: /* stvehx */
case 199: /* stvewx */
case 231: /* stvx */
case 487: /* stvxl */
tmp = EXTRACT_REGA(instr);
if(tmp > 0)
baseA = regs[tmp];
baseB = regs[EXTRACT_REGC(instr)];
/* determine Altivec alignment mask */
switch(EXTRACT_OP2(instr)) {
case 167: /* stvehx */
alignmask = 0xFFFFFFFE;
break;
case 199: /* stvewx */
alignmask = 0xFFFFFFFC;
break;
case 231: /* stvx */
alignmask = 0xFFFFFFF0;
break;
case 487: /* stvxl */
alignmask = 0xFFFFFFF0;
break;
}
break;
case 725: /* stswi */
tmp = EXTRACT_REGA(instr);
if(tmp > 0)
baseA = regs[tmp];
break;
default: /* ignore instruction */
return 0;
break;
}
break;
default: /* ignore instruction */
return 0;
break;
}
addr = (baseA + baseB) + disp;
addr &= alignmask;
return (sigsegv_address_t)addr;
powerpc_decode_instruction(&instr, nip, gpr);
return (sigsegv_address_t)instr.addr;
}
#endif
#endif
#endif
/*
* Instruction skipping
*/
#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
// Decode and skip X86 instruction
#if (defined(i386) || defined(__i386__))
@ -347,26 +422,15 @@ static inline int ix86_step_over_modrm(unsigned char * p)
return offset;
}
static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs)
static bool ix86_skip_instruction(unsigned int * regs)
{
unsigned char * eip = (unsigned char *)fault_instruction;
unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
if (eip == 0)
return false;
// Transfer type
enum {
TYPE_UNKNOWN,
TYPE_LOAD,
TYPE_STORE
} transfer_type = TYPE_UNKNOWN;
// Transfer size
enum {
SIZE_BYTE,
SIZE_WORD,
SIZE_LONG
} transfer_size = SIZE_LONG;
transfer_type_t transfer_type = TYPE_UNKNOWN;
transfer_size_t transfer_size = SIZE_LONG;
int reg = -1;
int len = 0;
@ -467,151 +531,36 @@ static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned
return true;
}
#endif
// Decode and skip PPC instruction
#if (defined(powerpc) || defined(__powerpc__))
#if defined(__linux__)
enum {
POWERPC_REG_GPR = 0,
POWERPC_REG_NIP = 32
};
#endif
static bool powerpc_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs)
#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
{
// Get opcode and divide into fields
unsigned int opcode = *((unsigned int *)fault_instruction);
unsigned int primop = opcode >> 26;
unsigned int exop = (opcode >> 1) & 0x3ff;
unsigned int ra = (opcode >> 16) & 0x1f;
unsigned int rb = (opcode >> 11) & 0x1f;
unsigned int rd = (opcode >> 21) & 0x1f;
signed int imm = (signed short)(opcode & 0xffff);
instruction_t instr;
powerpc_decode_instruction(&instr, *nip_p, regs);
// Analyze opcode
enum {
TYPE_UNKNOWN,
TYPE_LOAD,
TYPE_STORE
} transfer_type = TYPE_UNKNOWN;
enum {
SIZE_UNKNOWN,
SIZE_BYTE,
SIZE_HALFWORD,
SIZE_WORD
} transfer_size = SIZE_UNKNOWN;
enum {
MODE_UNKNOWN,
MODE_NORM,
MODE_U,
MODE_X,
MODE_UX
} addr_mode = MODE_UNKNOWN;
switch (primop) {
case 31:
switch (exop) {
case 23: // lwzx
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
case 55: // lwzux
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
case 87: // lbzx
transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
case 119: // lbzux
transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
case 151: // stwx
transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
case 183: // stwux
transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
case 215: // stbx
transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
case 247: // stbux
transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
case 279: // lhzx
transfer_type = TYPE_LOAD; transfer_size = SIZE_HALFWORD; addr_mode = MODE_X; break;
case 311: // lhzux
transfer_type = TYPE_LOAD; transfer_size = SIZE_HALFWORD; addr_mode = MODE_UX; break;
case 343: // lhax
transfer_type = TYPE_LOAD; transfer_size = SIZE_HALFWORD; addr_mode = MODE_X; break;
case 375: // lhaux
transfer_type = TYPE_LOAD; transfer_size = SIZE_HALFWORD; addr_mode = MODE_UX; break;
case 407: // sthx
transfer_type = TYPE_STORE; transfer_size = SIZE_HALFWORD; addr_mode = MODE_X; break;
case 439: // sthux
transfer_type = TYPE_STORE; transfer_size = SIZE_HALFWORD; addr_mode = MODE_UX; break;
}
break;
case 32: // lwz
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
case 33: // lwzu
transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
case 34: // lbz
transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
case 35: // lbzu
transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
case 36: // stw
transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
case 37: // stwu
transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
case 38: // stb
transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
case 39: // stbu
transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
case 40: // lhz
transfer_type = TYPE_LOAD; transfer_size = SIZE_HALFWORD; addr_mode = MODE_NORM; break;
case 41: // lhzu
transfer_type = TYPE_LOAD; transfer_size = SIZE_HALFWORD; addr_mode = MODE_U; break;
case 42: // lha
transfer_type = TYPE_LOAD; transfer_size = SIZE_HALFWORD; addr_mode = MODE_NORM; break;
case 43: // lhau
transfer_type = TYPE_LOAD; transfer_size = SIZE_HALFWORD; addr_mode = MODE_U; break;
case 44: // sth
transfer_type = TYPE_STORE; transfer_size = SIZE_HALFWORD; addr_mode = MODE_NORM; break;
case 45: // sthu
transfer_type = TYPE_STORE; transfer_size = SIZE_HALFWORD; addr_mode = MODE_U; break;
}
// Calculate effective address
unsigned int addr = 0;
switch (addr_mode) {
case MODE_X:
case MODE_UX:
if (ra == 0)
addr = regs[POWERPC_REG_GPR + rb];
else
addr = regs[POWERPC_REG_GPR + ra] + regs[POWERPC_REG_GPR + rb];
break;
case MODE_NORM:
case MODE_U:
if (ra == 0)
addr = (signed int)(signed short)imm;
else
addr = regs[POWERPC_REG_GPR + ra] + (signed int)(signed short)imm;
break;
default:
break;
}
if (transfer_type == TYPE_UNKNOWN) {
if (instr.transfer_type == TYPE_UNKNOWN) {
// Unknown machine code, let it crash. Then patch the decoder
return false;
}
#if DEBUG
printf("%08x: %s %s access", fault_instruction,
transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_HALFWORD ? "word" : "long",
transfer_type == TYPE_LOAD ? "read" : "write");
printf("%08x: %s %s access", *nip_p,
instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
instr.transfer_type == TYPE_LOAD ? "read" : "write");
if (addr_mode == MODE_U || addr_mode == MODE_UX)
printf(" r%d (ra = %08x)\n", ra, addr);
if (transfer_type == TYPE_LOAD)
printf(" r%d (rd = 0)\n", rd);
if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
if (instr.transfer_type == TYPE_LOAD)
printf(" r%d (rd = 0)\n", instr.rd);
#endif
if (addr_mode == MODE_U || addr_mode == MODE_UX)
regs[POWERPC_REG_GPR + ra] = addr;
if (transfer_type == TYPE_LOAD)
regs[POWERPC_REG_GPR + rd] = 0;
if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
regs[instr.ra] = instr.addr;
if (instr.transfer_type == TYPE_LOAD)
regs[instr.rd] = 0;
regs[POWERPC_REG_NIP] += 4;
*nip_p += 4;
return true;
}
#endif
@ -649,7 +598,7 @@ static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
#if HAVE_SIGSEGV_SKIP_INSTRUCTION
else if (sigsegv_ignore_fault) {
// Call the instruction skipper with the register file available
if (SIGSEGV_SKIP_INSTRUCTION(fault_instruction, SIGSEGV_REGISTER_FILE))
if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
fault_recovered = true;
}
#endif