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sh2 drc, fix reading from constant memory address

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This commit is contained in:
kub 2021-03-16 21:25:04 +01:00
parent d35a929551
commit 2d2387b293
2 changed files with 28 additions and 17 deletions
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3
cpu/drc/emit_x86.c
View file

@ -1033,8 +1033,7 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI, // x86-64,i386 common
#define host_instructions_updated(base, end, force) (void)(base),(void)(end)
#define emith_update_cache() /**/
// NB this MUST be <0x40000000 to avoid overflow in address calculations
#define emith_rw_offs_max() 0xfffffff // for better perfomance: <0x10000000
#define emith_rw_offs_max() 0xffffffffU
#ifdef __x86_64__

42
cpu/sh2/compiler.c
View file

@ -2590,8 +2590,21 @@ static void emit_le_ptr8(int cond, int r)
#endif
}
// split address by mask, in base part (upper) and offset (lower, signed!)
static uptr split_address(uptr la, uptr mask, s32 *offs)
{
uptr sign = (mask>>1) + 1; // sign bit in offset
*offs = (la & mask) | (la & sign ? ~mask : 0); // offset part, sign extended
la = (la & ~mask) + ((la & sign) << 1); // base part, corrected for offs sign
if (~mask && la == ~mask && !(*offs & sign)) { // special case la=-1 & offs>0
*offs = -*offs;
la = 0;
}
return la;
}
// NB may return either REG or TEMP
static int emit_get_rbase_and_offs(SH2 *sh2, sh2_reg_e r, int rmode, u32 *offs)
static int emit_get_rbase_and_offs(SH2 *sh2, sh2_reg_e r, int rmode, s32 *offs)
{
uptr omask = emith_rw_offs_max(); // offset mask
u32 mask = 0;
@ -2614,14 +2627,14 @@ static int emit_get_rbase_and_offs(SH2 *sh2, sh2_reg_e r, int rmode, u32 *offs)
a = (a + *offs) & mask;
if (poffs == offsetof(SH2, p_da)) {
// access sh2->data_array directly
a += offsetof(SH2, data_array);
emith_add_r_r_ptr_imm(hr, CONTEXT_REG, a & ~omask);
a = split_address(a + offsetof(SH2, data_array), omask, offs);
emith_add_r_r_ptr_imm(hr, CONTEXT_REG, a);
} else {
a = split_address(a, omask, offs);
emith_ctx_read_ptr(hr, poffs);
if (a & ~omask)
emith_add_r_r_ptr_imm(hr, hr, a & ~omask);
if (a)
emith_add_r_r_ptr_imm(hr, hr, a);
}
*offs = a & omask;
return hr;
}
@ -2637,24 +2650,23 @@ static int emit_get_rbase_and_offs(SH2 *sh2, sh2_reg_e r, int rmode, u32 *offs)
la -= (s32)((a & ~mask) - *offs); // diff between reg and memory
hr = hr2 = rcache_get_reg(r, rmode, NULL);
if ((s32)a < 0) emith_uext_ptr(hr2);
if (la & ~omask) {
la = split_address(la, omask, offs);
if (la) {
hr = rcache_get_tmp();
emith_add_r_r_ptr_imm(hr, hr2, la & ~omask);
emith_add_r_r_ptr_imm(hr, hr2, la);
rcache_free(hr2);
}
*offs = (la & omask);
} else {
// known fixed host address
la += (a + *offs) & mask;
la = split_address(la + ((a + *offs) & mask), omask, offs);
hr = rcache_get_tmp();
emith_move_r_ptr_imm(hr, la & ~omask);
*offs = la & omask;
emith_move_r_ptr_imm(hr, la);
}
return hr;
}
// read const data from const ROM address
static int emit_get_rom_data(SH2 *sh2, sh2_reg_e r, u32 offs, int size, u32 *val)
static int emit_get_rom_data(SH2 *sh2, sh2_reg_e r, s32 offs, int size, u32 *val)
{
u32 a, mask;
@ -2788,7 +2800,7 @@ static void emit_memhandler_write(int size)
}
// rd = @(Rs,#offs); rd < 0 -> return a temp
static int emit_memhandler_read_rr(SH2 *sh2, sh2_reg_e rd, sh2_reg_e rs, u32 offs, int size)
static int emit_memhandler_read_rr(SH2 *sh2, sh2_reg_e rd, sh2_reg_e rs, s32 offs, int size)
{
int hr, hr2;
u32 val;
@ -2859,7 +2871,7 @@ static int emit_memhandler_read_rr(SH2 *sh2, sh2_reg_e rd, sh2_reg_e rs, u32 off
}
// @(Rs,#offs) = rd; rd < 0 -> write arg1
static void emit_memhandler_write_rr(SH2 *sh2, sh2_reg_e rd, sh2_reg_e rs, u32 offs, int size)
static void emit_memhandler_write_rr(SH2 *sh2, sh2_reg_e rd, sh2_reg_e rs, s32 offs, int size)
{
int hr, hr2;
u32 val;