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Got the emulator to the point where we're hitting the first major emulation bug

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(the calloc test hangs).
This commit is contained in:
David Given 2018-06-14 05:53:39 -07:00
parent 853af4c4dd
commit 5111556d14
3 changed files with 43 additions and 11 deletions
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33
plat/linuxppc/emu/emu.c
View file

@ -44,6 +44,11 @@ static inline uint32_t ext16(int16_t n)
return (n << 16) >> 16;
}
static inline uint32_t ext26(int32_t n)
{
return (n << 6) >> 6;
}
static bool getcr(uint8_t bit)
{
bit = 31 - bit; /* note PowerPC bit numbering */
@ -59,7 +64,12 @@ static void setcr(uint8_t bit, bool value)
static void setcr0(bool setcr0, uint32_t value)
{
if (setcr0)
fatal("setcr0 not supported yet");
{
setcr(0, (int32_t)value < 0);
setcr(1, (int32_t)value > 0);
setcr(2, value == 0);
setcr(3, cpu.xer & (1<<31));
}
}
static void mcrf(uint8_t destfield, uint8_t srcfield)
@ -142,6 +152,8 @@ static int32_t divo(int32_t a, int32_t b, bool set_o)
if (set_o)
fatal("can't use O bit in div yet");
if (b == 0)
return 0;
return a / b;
}
@ -150,17 +162,27 @@ static uint32_t divuo(uint32_t a, uint32_t b, bool set_o)
if (set_o)
fatal("can't use O bit in divu yet");
if (b == 0)
return 0;
return a / b;
}
static void compares(int32_t a, int32_t b, uint8_t field)
{
fatal("compares not supported yet");
uint8_t bit = field*4;
setcr(bit+0, a<b);
setcr(bit+1, a>b);
setcr(bit+2, a==b);
setcr(bit+3, cpu.xer & (1<<31));
}
static void compareu(uint32_t a, uint32_t b, uint8_t field)
{
fatal("compareu not supported yet");
uint8_t bit = field*4;
setcr(bit+0, a<b);
setcr(bit+1, a>b);
setcr(bit+2, a==b);
setcr(bit+3, cpu.xer & (1<<31));
}
static uint32_t cntlzw(uint32_t source)
@ -207,11 +229,12 @@ void dump_state(FILE* stream)
fprintf(stream, "pc=0x%08x lr=0x%08x ctr=0x%08x xer=0x%08x cr=0x%08x\n",
cpu.cia, cpu.lr, cpu.ctr, cpu.xer, cpu.cr);
fprintf(stream, "insn=0x%08x", read_long(cpu.cia));
for (i=0; i<32; i++)
{
if ((i % 8) == 7)
if ((i % 4) == 0)
fprintf(stream, "\n");
fprintf(stream, "gpr%d=0x%08x ", i, cpu.gpr[i]);
fprintf(stream, "gpr%02d=0x%08x ", i, cpu.gpr[i]);
}
fprintf(stream, "\n");
}

8
plat/linuxppc/emu/instructions.dat
View file

@ -5,10 +5,10 @@
# Branch processor instructions.
<18--><LI-------------------->AL branch(0x1f, 0x00, LI<<2, A, L);
<16--><BO-><BI-><BD---------->AL branch(BO, BI, BD<<2, A, L);
<19--><BO-><BI-><BH-><16------>L branch(BO, BI, cpu.lr, 1, L);
<19--><BO-><BI-><BH-><528----->L branch(BO, BI, cpu.ctr, 1, L);
<18--><LI-------------------->AL branch(0x1f, 0x00, ext26(LI<<2), A, L);
<16--><BO-><BI-><BD---------->AL branch(BO, BI, ext16(BD<<2), A, L);
<19--><BO-><BI-><BH-><16------>L branch(BO, BI, cpu.lr, 1, L);
<19--><BO-><BI-><BH-><528----->L branch(BO, BI, cpu.ctr, 1, L);
<17-->..............<LEV-->...1. system_call(LEV);
# Condition register instructions.

13
plat/linuxppc/emu/main.c
View file

@ -2,6 +2,7 @@
#include <stdlib.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
@ -43,6 +44,8 @@ uint32_t entrypoint = RAM_BASE;
void fatal(char* fmt, ...)
{
static bool guard = false;
va_list ap;
va_start(ap, fmt);
@ -51,13 +54,19 @@ void fatal(char* fmt, ...)
fprintf(stderr, "\n");
va_end(ap);
if (!guard)
{
guard = true;
dump_state(stderr);
}
exit(EXIT_FAILURE);
}
static uint32_t transform_address(uint32_t address)
{
uint32_t a = address - RAM_BASE;
if (a >= RAM_TOP)
if (a >= (RAM_TOP-RAM_BASE))
fatal("address 0x%x out of bounds", address);
return a;
}
@ -168,7 +177,7 @@ int main(int argc, char* argv[])
for (;;)
{
dump_state(stderr);
//dump_state(stderr);
single_step();
}