Rev 1096 | Rev 1100 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
| Rev 1096 | Rev 1097 | ||
|---|---|---|---|
| Line 233... | Line 233... | ||
| 233 | # it seems that mips reserves some space on stack for varfuncs??? |
233 | # it seems that mips reserves some space on stack for varfuncs??? |
| 234 | #define SS_ARG4 16 |
234 | #define SS_ARG4 16 |
| 235 | #define SS_SP 20 |
235 | #define SS_SP 20 |
| 236 | #define SS_STATUS 24 |
236 | #define SS_STATUS 24 |
| 237 | #define SS_EPC 28 |
237 | #define SS_EPC 28 |
| 238 | #define SS_RA 32 |
- | |
| 239 | uspace_shortcut: |
238 | uspace_shortcut: |
| 240 | # We have a lot of space on the stack, with free use |
239 | # We have a lot of space on the stack, with free use |
| 241 | sw $sp, SS_SP($k0) |
240 | sw $sp, SS_SP($k0) |
| 242 | move $sp, $k0 |
241 | move $sp, $k0 |
| 243 | sw $ra, SS_RA($k0) |
- | |
| 244 | 242 | ||
| 245 | mfc0 $t1, $epc |
243 | mfc0 $t1, $epc |
| 246 | mfc0 $t0, $status |
244 | mfc0 $t0, $status |
| 247 | sw $t1,SS_EPC($sp) # Save EPC |
245 | sw $t1,SS_EPC($sp) # Save EPC |
| 248 | 246 | ||
| Line 255... | Line 253... | ||
| 255 | mtc0 $t0, $status |
253 | mtc0 $t0, $status |
| 256 | 254 | ||
| 257 | jal syscall_handler |
255 | jal syscall_handler |
| 258 | sw $v0, SS_ARG4($sp) # save v0 - arg4 to stack |
256 | sw $v0, SS_ARG4($sp) # save v0 - arg4 to stack |
| 259 | 257 | ||
| 260 | # Restore RA |
- | |
| 261 | lw $ra, SS_RA($sp) |
- | |
| 262 | - | ||
| 263 | # restore epc+4 |
258 | # restore epc+4 |
| 264 | lw $t0,SS_EPC($sp) |
259 | lw $t0,SS_EPC($sp) |
| 265 | addi $t0, $t0, 4 |
260 | addi $t0, $t0, 4 |
| 266 | mtc0 $t0, $epc |
261 | mtc0 $t0, $epc |
| 267 | 262 | ||