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Handle 8, 16 and 32 bit accesses to extram.

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This commit is contained in:
Toby Jaffey 2025-12-11 10:33:45 +00:00
parent 63386f9a92
commit 7a1656ab10
5 changed files with 163 additions and 12 deletions
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25
test/extram/rom/rom.c
View file

@ -13,19 +13,36 @@ void main(void) {
} break;
case TEST2: {
uint32_t *p = (uint32_t *)UVM32_EXTRAM_BASE;
printdec(p[32]); // past the end
printdec(p[32]); // word read
} break;
case TEST3: {
uint32_t *p = (uint32_t *)UVM32_EXTRAM_BASE;
p[32] = 1234; // past the end
p[32] = 1234; // past the end, out of bounds
} break;
case TEST4: {
uint32_t *p = (uint32_t *)UVM32_EXTRAM_BASE;
p[0] = 1234; // good write
p[0] = 1234; // word write
yield(0);
} break;
case TEST5: {
uint8_t *p = (uint8_t *)UVM32_EXTRAM_BASE;
p[7] = 0xAB; // single byte write
yield(0);
} break;
case TEST6: {
uint8_t *p = (uint8_t *)UVM32_EXTRAM_BASE;
printdec(p[7]); // single byte read
} break;
case TEST7: {
uint16_t *p = (uint16_t *)UVM32_EXTRAM_BASE;
p[7] = 0xABCD; // short write
yield(0);
} break;
case TEST8: {
uint16_t *p = (uint16_t *)UVM32_EXTRAM_BASE;
printdec(p[7]); // short read
} break;
}
}

6
test/extram/shared.h
View file

@ -6,5 +6,11 @@ enum {
TEST2,
TEST3,
TEST4,
TEST5,
TEST6,
TEST7,
TEST8,
TEST9,
TEST10,
};

93
test/extram/test/tests.c
View file

@ -97,3 +97,96 @@ void test_extram_out_of_bounds_dirty_flag(void) {
TEST_ASSERT_EQUAL(false, uvm32_extramDirty(&vmst));
}
void test_extram_byte_write(void) {
// run the vm
uvm32_run(&vmst, &evt, 100);
TEST_ASSERT_EQUAL(false, uvm32_extramDirty(&vmst));
// check for picktest syscall
TEST_ASSERT_EQUAL(evt.typ, UVM32_EVT_SYSCALL);
TEST_ASSERT_EQUAL(evt.data.syscall.code, SYSCALL_PICKTEST);
uvm32_setval(&vmst, &evt, RET, TEST5);
uvm32_run(&vmst, &evt, 100);
TEST_ASSERT_EQUAL(true, uvm32_extramDirty(&vmst));
// check that byte 7 only of extram has changed
uint8_t *p = (uint8_t *)extram;
for (int i=0;i<sizeof(extram);i++) {
if (i == 7) {
TEST_ASSERT_EQUAL(0xAB, p[i]);
} else {
TEST_ASSERT_EQUAL(0x00, p[i]);
}
}
}
void test_extram_byte_read(void) {
// run the vm
uvm32_run(&vmst, &evt, 100);
TEST_ASSERT_EQUAL(false, uvm32_extramDirty(&vmst));
// check for picktest syscall
TEST_ASSERT_EQUAL(evt.typ, UVM32_EVT_SYSCALL);
TEST_ASSERT_EQUAL(evt.data.syscall.code, SYSCALL_PICKTEST);
uvm32_setval(&vmst, &evt, RET, TEST6);
// set only byte 7 in extram
uint8_t *p = (uint8_t *)extram;
p[7] = 0xCD;
uvm32_run(&vmst, &evt, 100);
TEST_ASSERT_EQUAL(false, uvm32_extramDirty(&vmst));
// check for printdec of val
TEST_ASSERT_EQUAL(UVM32_EVT_SYSCALL, evt.typ);
TEST_ASSERT_EQUAL(evt.data.syscall.code, UVM32_SYSCALL_PRINTDEC);
TEST_ASSERT_EQUAL(0xCD, uvm32_getval(&vmst, &evt, ARG0));
}
void test_extram_short_write(void) {
// run the vm
uvm32_run(&vmst, &evt, 100);
TEST_ASSERT_EQUAL(false, uvm32_extramDirty(&vmst));
// check for picktest syscall
TEST_ASSERT_EQUAL(evt.typ, UVM32_EVT_SYSCALL);
TEST_ASSERT_EQUAL(evt.data.syscall.code, SYSCALL_PICKTEST);
uvm32_setval(&vmst, &evt, RET, TEST7);
uvm32_run(&vmst, &evt, 100);
TEST_ASSERT_EQUAL(true, uvm32_extramDirty(&vmst));
// check that short 7 only of extram has changed
uint16_t *p = (uint16_t *)extram;
for (int i=0;i<sizeof(extram);i++) {
if (i == 7) {
TEST_ASSERT_EQUAL(0xABCD, p[i]);
} else {
TEST_ASSERT_EQUAL(0x00, p[i]);
}
}
}
void test_extram_short_read(void) {
// run the vm
uvm32_run(&vmst, &evt, 100);
TEST_ASSERT_EQUAL(false, uvm32_extramDirty(&vmst));
// check for picktest syscall
TEST_ASSERT_EQUAL(evt.typ, UVM32_EVT_SYSCALL);
TEST_ASSERT_EQUAL(evt.data.syscall.code, SYSCALL_PICKTEST);
uvm32_setval(&vmst, &evt, RET, TEST8);
// set only short 7 in extram
uint16_t *p = (uint16_t *)extram;
p[7] = 0xCDEF;
uvm32_run(&vmst, &evt, 100);
TEST_ASSERT_EQUAL(false, uvm32_extramDirty(&vmst));
// check for printdec of val
TEST_ASSERT_EQUAL(UVM32_EVT_SYSCALL, evt.typ);
TEST_ASSERT_EQUAL(evt.data.syscall.code, UVM32_SYSCALL_PRINTDEC);
TEST_ASSERT_EQUAL(0xCDEF, uvm32_getval(&vmst, &evt, ARG0));
}

41
uvm32/uvm32.c
View file

@ -326,12 +326,34 @@ uvm32_evt_syscall_buf_t uvm32_getbuf_fixed(uvm32_state_t *vmst, uvm32_evt_t *evt
return scb;
}
uint32_t uvm32_extramLoad(void *userdata, uint32_t addr) {
uint32_t uvm32_extramLoad(void *userdata, uint32_t addr, uint32_t accessTyp) {
uvm32_state_t *vmst = (uvm32_state_t *)userdata;
addr -= UVM32_EXTRAM_BASE;
if (vmst->extram != UVM32_NULL) {
if (addr < vmst->extramLen) {
switch(accessTyp) {
case 0:
return ((int8_t *)vmst->extram)[addr];
break;
case 1:
return ((int16_t *)vmst->extram)[addr/2];
break;
case 2:
return ((uint32_t *)vmst->extram)[addr / 4];
break;
case 4:
return ((uint8_t *)vmst->extram)[addr];
break;
case 5:
return ((uint16_t *)vmst->extram)[addr/2];
break;
default:
setStatusErr(vmst, UVM32_ERR_MEM_RD);
return 0;
break;
}
} else {
setStatusErr(vmst, UVM32_ERR_MEM_RD);
}
@ -339,12 +361,25 @@ uint32_t uvm32_extramLoad(void *userdata, uint32_t addr) {
return 0;
}
uint32_t uvm32_extramStore(void *userdata, uint32_t addr, uint32_t val ) {
uint32_t uvm32_extramStore(void *userdata, uint32_t addr, uint32_t val, uint32_t accessTyp) {
uvm32_state_t *vmst = (uvm32_state_t *)userdata;
addr -= UVM32_EXTRAM_BASE;
if (vmst->extram != UVM32_NULL) {
if (addr < vmst->extramLen) {
((uint32_t *)vmst->extram)[addr / 4] = val;
switch(accessTyp) {
case 0:
((uint8_t *)vmst->extram)[addr] = val;
break;
case 1:
((uint16_t *)vmst->extram)[addr/2] = val;
break;
case 2:
((uint32_t *)vmst->extram)[addr/4] = val;
break;
default:
setStatusErr(vmst, UVM32_ERR_MEM_WR);
break;
}
vmst->extramDirty = true;
} else {
setStatusErr(vmst, UVM32_ERR_MEM_WR);

8
uvm32/uvm32.h
View file

@ -55,10 +55,10 @@ typedef struct {
#define MINIRV32_DECORATE static
#define MINI_RV32_RAM_SIZE UVM32_MEMORY_SIZE
#define MINIRV32_POSTEXEC(pc, ir, retval) {if (retval > 0) return retval;}
uint32_t uvm32_extramLoad(void *userdata, uint32_t addr);
uint32_t uvm32_extramStore(void *userdata, uint32_t addr, uint32_t val);
#define MINIRV32_HANDLE_MEM_LOAD_CONTROL( addy, rval ) rval = uvm32_extramLoad(userdata, addy);
#define MINIRV32_HANDLE_MEM_STORE_CONTROL( addy, val ) if( uvm32_extramStore(userdata, addy, val) ) return val;
uint32_t uvm32_extramLoad(void *userdata, uint32_t addr, uint32_t accessTyp);
uint32_t uvm32_extramStore(void *userdata, uint32_t addr, uint32_t val, uint32_t accessTyp);
#define MINIRV32_HANDLE_MEM_LOAD_CONTROL( addy, rval ) rval = uvm32_extramLoad(userdata, addy, ( ir >> 12 ) & 0x7);
#define MINIRV32_HANDLE_MEM_STORE_CONTROL( addy, val ) if( uvm32_extramStore(userdata, addy, val, ( ir >> 12 ) & 0x7) ) return val;
#ifndef MINIRV32_IMPLEMENTATION
#define MINIRV32_STEPPROTO