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riscv: refine vector context layout on stack (#1329)

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Vector general register layout:

Before:
+--------------+  <-- High Address
|      v7      |
+--------------+
|      v6      |
+--------------+
|      ...     |
+--------------+
|      v0      |
+--------------+  <-- v0 - v7
|      v15     |
+--------------+
|      v14     |
+--------------+
|      ...     |
+--------------+
|      v8      |
+--------------+  <-- v8 - v15
|      ...     |
+--------------+
|      v24     |
+--------------+  <-- Low address

After:
+--------------+  <-- High Address
|      v31     |
+--------------+
|      v30     |
+--------------+
|      ...     |
+--------------+
|      v1      |
+--------------+
|      v0      |
+--------------+ <-- Low Address

Signed-off-by: wangfei_chen <wangfei_chen@realsil.com.cn>
Co-authored-by: wangfei_chen <wangfei_chen@realsil.com.cn>
Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>
This commit is contained in:
Saiiijchan 2025-11-05 00:44:16 +08:00 • committed by GitHub
parent c8d31ddcff
commit 439af33c52
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GPG key ID: B5690EEEBB952194
1 changed files with 8 additions and 8 deletions
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16
portable/GCC/RISC-V/portContext.h
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@ -214,13 +214,13 @@ neg t0, t0
/* Store the vector registers in group of 8. */
add sp, sp, t0
vs8r.v v0, (sp) /* Store v0-v7. */
add sp, sp, t0
vs8r.v v8, (sp) /* Store v8-v15. */
vs8r.v v24, (sp) /* Store v24-v31. */
add sp, sp, t0
vs8r.v v16, (sp) /* Store v16-v23. */
add sp, sp, t0
vs8r.v v24, (sp) /* Store v24-v31. */
vs8r.v v8, (sp) /* Store v8-v15. */
add sp, sp, t0
vs8r.v v0, (sp) /* Store v0-v7. */
/* Store the VPU CSRs. */
addi sp, sp, -( 4 * portWORD_SIZE )
@ -256,13 +256,13 @@ csrr t0, vlenb /* t0 = vlenb. vlenb is the length of each vector register in byt
slli t0, t0, 3 /* t0 = vlenb * 8. t0 now contains the space required to store 8 vector registers. */
/* Restore the vector registers. */
vl8r.v v24, (sp)
vl8r.v v0, (sp) /* Restore v0-v7. */
add sp, sp, t0
vl8r.v v16, (sp)
vl8r.v v8, (sp) /* Restore v8-v15. */
add sp, sp, t0
vl8r.v v8, (sp)
vl8r.v v16, (sp) /* Restore v16-v23. */
add sp, sp, t0
vl8r.v v0, (sp)
vl8r.v v24, (sp) /* Restore v23-v31. */
add sp, sp, t0
/* Re-reserve the space for mstatus and epc. */