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Allow JR between sections

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Previously, JR was only allowed if the destination label was in the same
section as the JR. This patch removes this restriction. The check to see
if the relative value overflows is now done when linking the ROM.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>
This commit is contained in:
Antonio Niño Díaz
2018-02-22 23:39:41 +00:00
parent d243bd04ef
commit 2ed937db2c
6 changed files with 48 additions and 23 deletions
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19
src/link/patch.c
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@@ -267,6 +267,7 @@ void Patch(void)
pPatch = pSect->pPatches;
while (pPatch) {
int32_t t;
int32_t nPatchOrg;
nPC = pSect->nOrg + pPatch->nOffset;
t = calcrpn(pPatch);
@@ -306,6 +307,24 @@ void Patch(void)
pSect->pData[pPatch->nOffset + 3] =
(t >> 24) & 0xFF;
break;
case PATCH_BYTE_JR:
/* Calculate absolute address of the patch */
nPatchOrg = pSect->nOrg + pPatch->nOffset;
/* t contains the destination of the jump */
t = (int16_t)((t & 0xFFFF) - (nPatchOrg + 1));
if (t >= -128 && t <= 255) {
t &= 0xFF;
pSect->pData[pPatch->nOffset] =
(uint8_t)t;
} else {
errx(1,
"%s(%ld) : Value must be 8-bit",
pPatch->pzFilename,
pPatch->nLineNo);
}
break;
}
pPatch = pPatch->pNext;