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libucontext
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Added saving/restoring of bottom 64 bits of d8-d15 per AAPCS64 #31

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rlcamp merged 1 commits from master into master 2021-07-30 01:49:13 +00:00
Conversation 0 Commits 1 Files Changed 5
5 changed files with 16 additions and 3 deletions
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1
arch/aarch64/defs.h
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@ -9,6 +9,7 @@
#define SP_OFFSET 432
#define PC_OFFSET 440
#define PSTATE_OFFSET 448
#define D8_OFFSET 456
#ifndef FPSIMD_MAGIC
# define FPSIMD_MAGIC 0x46508001

5
arch/aarch64/getcontext.S
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@ -50,7 +50,10 @@ PROC_NAME(libucontext_getcontext):
/* save pstate */
str xzr, [x0, #PSTATE_OFFSET]
/* TODO: SIMD / FPRs */
stp d8, d9, [x0, #D8_OFFSET + 0]
stp d10, d11, [x0, #D8_OFFSET + 16]
stp d12, d13, [x0, #D8_OFFSET + 32]
stp d14, d15, [x0, #D8_OFFSET + 48]
mov x0, #0
ret

3
arch/aarch64/include/libucontext/bits.h
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@ -14,7 +14,8 @@ typedef struct sigcontext {
unsigned long fault_address;
unsigned long regs[31];
unsigned long sp, pc, pstate;
long double __reserved[256];
unsigned long d8_through_d15[8];
long double __reserved[252];
} libucontext_mcontext_t;
typedef struct {

5
arch/aarch64/setcontext.S
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@ -33,7 +33,10 @@ PROC_NAME(libucontext_setcontext):
ldr x2, [x0, #SP_OFFSET]
mov sp, x2
/* TODO: SIMD / FPRs */
ldp d8, d9, [x0, #D8_OFFSET + 0]
ldp d10, d11, [x0, #D8_OFFSET + 16]
ldp d12, d13, [x0, #D8_OFFSET + 32]
ldp d14, d15, [x0, #D8_OFFSET + 48]
/* save current program counter in link register */
ldr x16, [x0, #PC_OFFSET]

5
arch/aarch64/swapcontext.S
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@ -49,6 +49,11 @@ PROC_NAME(libucontext_swapcontext):
/* save pstate */
str xzr, [x0, #PSTATE_OFFSET]
stp d8, d9, [x0, #D8_OFFSET + 0]
stp d10, d11, [x0, #D8_OFFSET + 16]
stp d12, d13, [x0, #D8_OFFSET + 32]
stp d14, d15, [x0, #D8_OFFSET + 48]
/* context to swap to is in x1 so... we move to x0 and call setcontext */
/* store our link register in x28 */
mov x28, x30