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Add a new .cap pseudo function to the assembler that allows to check for

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certain capabilities of the CPU or target system.
This commit is contained in:
Kugel Fuhr
2025-06-30 21:37:43 +02:00
parent a4a24280f2
commit d4e57278c6
12 changed files with 434 additions and 6 deletions
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82
src/common/cpu.c
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@@ -33,6 +33,8 @@
#include <stdint.h>
/* common */
#include "addrsize.h"
#include "check.h"
@@ -90,6 +92,77 @@ const unsigned CPUIsets[CPU_COUNT] = {
CPU_ISET_65CE02 | CPU_ISET_6502 | CPU_ISET_65C02,
};
/* Defines for capabilities. Currently the entries are uint32_ts but the table
** is deliberately hidden from the outside so it can be extended to 64 bit or
** even more.
*/
#define CAP_NONE UINT32_C (0)
#define CAP_6502 UINT32_C (0)
#define CAP_6502X UINT32_C (0)
#define CAP_6502DTV UINT32_C (0)
#define CAP_65SC02 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA) | \
(UINT32_C (1) << CAP_CPU_HAS_PUSHXY) | \
(UINT32_C (1) << CAP_CPU_HAS_ZPIND) | \
(UINT32_C (1) << CAP_CPU_HAS_STZ))
#define CAP_65C02 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA) | \
(UINT32_C (1) << CAP_CPU_HAS_PUSHXY) | \
(UINT32_C (1) << CAP_CPU_HAS_ZPIND) | \
(UINT32_C (1) << CAP_CPU_HAS_STZ))
#define CAP_65816 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA) | \
(UINT32_C (1) << CAP_CPU_HAS_PUSHXY) | \
(UINT32_C (1) << CAP_CPU_HAS_ZPIND) | \
(UINT32_C (1) << CAP_CPU_HAS_STZ))
#define CAP_SWEET16 UINT32_C (0)
#define CAP_HUC6280 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA) | \
(UINT32_C (1) << CAP_CPU_HAS_PUSHXY) | \
(UINT32_C (1) << CAP_CPU_HAS_ZPIND) | \
(UINT32_C (1) << CAP_CPU_HAS_STZ))
#define CAP_M740 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA))
#define CAP_4510 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA) | \
(UINT32_C (1) << CAP_CPU_HAS_PUSHXY))
#define CAP_45GS02 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA) | \
(UINT32_C (1) << CAP_CPU_HAS_PUSHXY))
#define CAP_W65C02 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA) | \
(UINT32_C (1) << CAP_CPU_HAS_PUSHXY))
#define CAP_65CE02 \
((UINT32_C (1) << CAP_CPU_HAS_BRA8) | \
(UINT32_C (1) << CAP_CPU_HAS_INA) | \
(UINT32_C (1) << CAP_CPU_HAS_PUSHXY))
/* Table containing one capability entry per CPU */
static const uint64_t CPUCaps[CPU_COUNT] = {
CAP_NONE, /* CPU_NONE */
CAP_6502, /* CPU_6502 */
CAP_6502X, /* CPU_6502X */
CAP_6502DTV, /* CPU_6502DTV */
CAP_65SC02, /* CPU_65SC02 */
CAP_65C02, /* CPU_65C02 */
CAP_65816, /* CPU_65816 */
CAP_SWEET16, /* CPU_SWEET16 */
CAP_HUC6280, /* CPU_HUC6280 */
CAP_M740, /* CPU_M740 */
CAP_4510, /* CPU_4510 */
CAP_45GS02, /* CPU_45GS02 */
CAP_W65C02, /* CPU_W65C02 */
CAP_65CE02, /* CPU_65CE02 */
};
/*****************************************************************************/
@@ -148,3 +221,12 @@ cpu_t FindCPU (const char* Name)
/* Not found */
return CPU_UNKNOWN;
}
int CPUHasCap (capability_t Cap)
/* Check if the current CPU has the given capability */
{
PRECONDITION (CPU >= 0 && CPU < CPU_COUNT);
return (CPUCaps[CPU] & (UINT32_C (1) << Cap)) != 0;
}