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M295: 68020 scaled-index JSR differential coverage #13

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pgousdal merged 2 commits into from
Oct 9, 2026
Merged

M295: 68020 scaled-index JSR differential coverage #13

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9360182
test: cover 68020 full-extension scaled index JSR x4 (M295)
pgousdal Oct 9, 2026
41d98f1
test: add long negative displacement, x8 scale and suppression cases …
pgousdal Oct 9, 2026
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37 changes: 37 additions & 0 deletions tests/test_m283.c
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,43 @@ int main(void) {
};
CHECK(run_case_setup("JSR full extension word base displacement / RTS",
jsr_full_word_bd,sizeof(jsr_full_word_bd),0u,1)==0);
/* M295: 68020 full extension without memory indirect. All targets
* resolve to ROM+0x110 (offset +16), where RTS returns to BRA.S. */
static const uint8_t jsr_full_scaled_d1[] = {
0x4eu,0xb0u,0x15u,0x10u, /* D1.W x4, null base displacement */
0x60u,0xfeu,0x4eu,0x71u,0x4eu,0x71u,
0x4eu,0x71u,0x4eu,0x71u,0x4eu,0x71u,0x4eu,0x75u
};
CHECK(run_case_index("JSR full scaled D1.W x4",jsr_full_scaled_d1,
sizeof(jsr_full_scaled_d1),0u,1,1u,0u)==0);
/* M295: full extension, long negative base displacement with D1.W x8.
* A0=ROM+0x10c, D1=1, displacement=-4 => target ROM+0x110. */
static const uint8_t jsr_full_long_negative_bd[] = {
0x4eu,0xb0u,0x17u,0x30u,0xffu,0xffu,0xffu,0xfcu,
0x60u,0xfeu,0x4eu,0x71u,0x4eu,0x71u,0x4eu,0x71u,
0x4eu,0x75u
};
CHECK(run_case_index("JSR full long negative BD, D1.W x8",
jsr_full_long_negative_bd,sizeof(jsr_full_long_negative_bd),
0u,1,1u,0u)==0);
/* Base suppressed, D1.L supplies absolute ROM address; no BD. */
static const uint8_t jsr_full_base_suppressed[] = {
0x4eu,0xb0u,0x19u,0x90u,
0x60u,0xfeu,0x4eu,0x71u,0x4eu,0x71u,
0x4eu,0x71u,0x4eu,0x71u,0x4eu,0x71u,0x4eu,0x75u
};
CHECK(run_case_index("JSR full base suppressed, D1.L absolute",
jsr_full_base_suppressed,sizeof(jsr_full_base_suppressed),
0u,1,AMIVM_ROM_BASE+0x110u,0u)==0);
/* Index suppressed, negative word displacement, base A0+6. */
static const uint8_t jsr_full_index_suppressed[] = {
0x4eu,0xb1u,0x01u,0x60u,0xffu,0xfeu,
0x60u,0xfeu,0x4eu,0x71u,0x4eu,0x71u,
0x4eu,0x71u,0x4eu,0x71u,0x4eu,0x75u
};
CHECK(run_case_index("JSR full index suppressed negative BD",
jsr_full_index_suppressed,sizeof(jsr_full_index_suppressed),
0u,1,0u,AMIVM_ROM_BASE+0x112u)==0);
/* Exercise data-register and condition-code changes before a BRA loop. */
static const uint8_t moveq_zero_bra[] = {0x70u,0x00u,0x60u,0xfeu};
static const uint8_t moveq_neg_bra[] = {0x70u,0xffu,0x60u,0xfeu};
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